Wall Cloud near Clairevale

Winnipeg & Area’s Top 10 Weather Stories of 2015

2015 brought a huge assortment of wild weather to Southern Manitoba. From torrential rains, damaging wind storms, tornadoes, and above-normal temperatures to snow storms, there wasn’t much waiting between significant weather events. Here’s our top 10 weather stories of 2015!

#10 – Parade of Snowstorms Just Before Christmas

Three snowstorms dumped a total of 40 cm of snow from December 16th to 23rd in Winnipeg.

The biggest snowstorm occurred on the 16th and 17th, dumping 20 cm. Strong winds helped carve drifts up to two-feet deep in some spots. 18 cm fell on December 16th alone at the official Charleswood station, breaking the old record of 8.4 cm in 1942 for the day.

Snowfall totals from the December 22-23, 2015 Snow Storm
Snowfall totals from the December 22-23, 2015 snow storm

With all the snow in mid December, travel was dramatically impacted. Residential streets were difficult to navigate and numerous vehicles were reported stuck in the snow. Thanks to the snowfall, snow depth in Winnipeg sat at 30 cm on Christmas morning; this was the deepest snow pack on Christmas Day in 15 years (since a 30 cm depth in 2000). In total, 44.0 cm of snow fell in Winnipeg in December, 83% above normal and the 12th snowiest December on record since 1872.

#9 – Dry Winter and Warm January

After a frigid start to January, a warm spell blessed southern Manitoba with above normal temperatures. A 17-day streak of above normal temperatures occurred from January 14 to 30. During this period, daily highs averaged -1.9°C and daily lows averaged -12.1°C, about 10°C warmer than normal. 6 days in the period exceeded the freezing mark and 6 days never saw temperatures dip below -10°C. The warmest days were January 22 and 23 when temperatures soared to 3.7°C and 3.1°C at the airport respectively. It was warmer inside the city with highs between 4 and 6°C. Some parts of southern Manitoba never even dipped below freezing on January 23. The extended warm spell melted what little snow was on the ground. By January 31, snow depth in Winnipeg was 12 cm, the 12th thinnest on record for the day since 1941. Gloomy skies and freezing drizzle were also common during the warm spell.

In the end, January averaged -13.7°C, tied with 2010 for 19th warmest since 1873.

Overall, it was a very dry winter. Only about 31 mm of precipitation fell from December to February, the 9th driest winter on record since 1872. 44.4 cm of snow fell, the 29th least snowy winter.

#8 – A Summer of High Humidity

With an average dewpoint of 13.6°C (June to August), summer 2015 tied with 1996 for 4th most humid summer on record in Winnipeg since 1953. 22 days from June to August saw dewpoints exceed 20°C, the 2nd most since 1953 and well above the normal of 10 days.

Dewpoint temperatures in July specifically averaged 16.1°C, the 2nd most humid July and month on record since 1953. The 1981-2010 normal is 14.2°C. An 8-day streak with dewpoints over 20°C occurred mid month. A maximum dewpoint of 24.1°C was achieved on July 12, breaking the old record of 23.9°C in 1955 for the day. 14 days saw dewpoints over 20°C, tied with 1957 for most on record in July since 1953.

A 5-day heat wave hit southern Manitoba in mid August. Temperatures exceeded 30°C and on some days 32°C. August 14 was the hottest day with some records broken, including in Brandon with a high of 36.6°C. Four days with dewpoints over 20°C accompanied the heat wave. Dewpoint temperature peaked at 24.5°C in Winnipeg on August 15, shattering the old record of 21.7°C in 1972 for the day. It was also the latest occurrence of dewpoint over 24°C since 1953. High minimum temperature records were also broken in Winnipeg (21.2°C) and Morden (22.0°C).

#7 – Summer in September

September began with a three-day heat wave as temperatures exceeded 30°C and in some cases 32°C. Oppressive humidity accompanied the heat which is unusual for September. The main records broken during the heat wave are listed below. Note: temperature records go back to 1872 while dewpoint and humidex records go back to 1953.

  • Record high minimum of 21.0°C on the 3rd was also the second highest in September.
  • Two high dewpoint and three high minimum dewpoint records were broken, including:
    • High dewpoint of 23.1°C on the 3rd was also just shy of the all-time September high of 23.4°C in 1983 and was the second highest in September.
    • A high minimum dewpoint of 18.7°C on the 3rd was also an all-time high for September.
  • Humidex reached 42.0 on the 3rd, the second highest in September. This, along with a humidex value of 40.1 the previous day, were only two of six occurrences of humidex over 40 in September since 1953.

Strong thunderstorms on the 4th and 5th ended the heat wave with a bang. Severe storms between 1 and 8 am on the 4th dropped dime to toonie size hail southeast of Winnipeg and northwest of Minnedosa. Strong thunderstorms moved up the Red River Valley in the afternoon. The Winnipeg area saw 30 to 50 mm of rain in under an hour, causing severe street flooding. Wind gusts over 80 km/h also caused some damage. With more rain later on, daily totals sat between 40 and 60 mm. The airport recorded 41.1 mm, breaking the record of 36.8 mm in 1872. Heavy thunderstorms moved up the Red River Valley again on the 5th, dumping 15-40 mm of rain southeast of Winnipeg.

Another 30°C day occurred on September 13. Winnipeg reached 31.6°C, just shy of the record of 31.7°C in 1927. Records were broken along the US border including in Morden and Pilot Mound where highs of 33.8°C and 33.3°C occurred.

It was the 6th warmest September on record since 1872 in Winnipeg with an average mean temperature of 15.8°C. It was also the second warmest since 1949. Dewpoint temperatures averaged 9.8°C, the 3rd most humid September since 1953.

#6 – A Very Early Spring

April-like temperatures arrived by the second week of March. Record highs were achieved on the 14th and 15th. Winnipeg reached 13.2°C on March 14, breaking the old record of 11.4°C in 1981. A high of 14.3°C the following day was just shy of the record of 14.4°C in 2012. The warmest temperatures occurred along the US border. Morden reached 18.3°C on the 14th and 17.6°C on the 15th, the earliest occurrences of temperature over 16°C on record since 1904. The high of 18.3°C on March 14 broke the old 2012 record by an impressive 7.1°C! Nights were unusually mild as well. A morning low of 6.7⁰C in Winnipeg on March 15 was the warmest morning low for so early in the year since 1953.

The winter snow pack disappeared in Winnipeg by March 15, tied with 1995 for third earliest snow melt since 1955. This was a day later than in 2012 and a day earlier than in 2010.

In the end, March averaged -3.0°C, 2.8°C warmer than normal and the 20th warmest March since 1872. Even thunderstorms with small hail occurred on March 30 west and north of Winnipeg. No thunder was heard in Winnipeg but small hail fell in the south end with some convective showers.

#5 – Active Thunderstorm Season in Southern Manitoba

Manitoba had the greatest number of reported tornadoes and waterspouts in Canada for 2015. In addition, Manitoba had the most severe hail and severe thunderstorm rain reports of the three Prairie provinces.

At least 11 tornadoes and waterspouts occurred in Manitoba in 2015, the most in more than 5 years. Two events brought worldwide attention: at least 2 tornadoes and waterspouts on July 18 near Matlock and at least 3 tornadoes on July 27 in southwestern Manitoba(3 tornadoes were mentioned in Justin Hobson’s chase story).

On July 18, a landspout tornado near Matlock travelled over Lake Winnipeg, becoming a waterspout. The storm produced at least one other waterspout and they occurred simultaneously. The storm and funnels were photogenic and photos spread around the world on social media.

On July 27, a supercell travelled over 100 km from Tilston to northeast of Virden, producing multiple tornadoes in a 3-hour timeframe. Some were violent as seen on videos. One tornado reached about a kilometre wide. Luckily, the tornadoes dodged all major communities.

Only a few farms and highways experienced damage. Environment Canada sent a damage survey team to investigate. The worst damage they saw was from a high-end EF-2 tornado (winds close to 200 km/h). It is entirely possible that the tornadoes may have been even stronger, but because they weren’t hitting anything significant it is impossible to tell.

Hail was also a big story this summer across southern Manitoba. The greatest proportion of severe hail reports were in August thanks to extreme nocturnal activity mid and late month. Significant hail events occurred on August 12, 22 and 28.

Along with parts of southern Alberta, southern Manitoba had the greatest concentration of severe thunderstorm warning days as seen in the map below. The Minnedosa warning region of southwestern Manitoba saw 19 days in 2015 with a severe thunderstorm warning, the most of all warning regions in Canada.

#4 – May Long Weekend Storm

A Colorado Low slammed southern Manitoba during the May Long Weekend. Heavy rain, damaging wind, large waves on the lakes and snowfall occurred.

The rain in Winnipeg began late on Saturday May 16 and persisted the entire day on Sunday May 17. 35-50 mm fell in the city. 31.3 mm fell at Winnipeg airport on May 17 alone, breaking the old record of 22.9 mm in 1903 for the day. Heavier rains fell to the southwest with 50-90 mm from Morden to Carman to Melita. Significant overland flooding occurred with many farm fields underwater.

The rain was accompanied by sustained winds of 47 to 63 km/h at Winnipeg airport for 22 consecutive hours. Wind gusts were between 80 and 95 km/h. A peak gust of 93 km/h was recorded in Winnipeg. The wind damaged property, caused power outages and uprooted trees. In addition, larges waves and storm surge occurred on Lake Manitoba and Lake Winnipeg.

On Monday May 18, snow and strong wind occurred. Snow fell throughout the night, ending in the morning. The cold and wind combined to produce wind chill values of -9. Between a dusting and 3 cm of snow fell in Winnipeg, depending where you were. 2.5 cm was measured in Charleswood on May 18 alone, just shy of the old record of 3.0 cm in 1963. A snow depth of 2 cm in the morning observation broke the old record of trace cm. The snow melted in the afternoon. This was the latest spring snowfall in Winnipeg since 2002 when a trace cm fell on May 23 and the latest snowfall accumulation since 1969 when 0.3 cm fell on June 12. Prior to this year, snow had fallen on May 18 only 4 times since 1872. Heavier snow fell west of the city with a swath of 10-15 cm from Boissevain to McGregor to Teulon to the Gimli area.

– August 22-23 Severe Thunderstorms and Heavy Rain

Significant thunderstorms and heavy rain pummelled Winnipeg and the surrounding area on August 22 and 23. Due to extreme nature of the event and the large area affected, the event is considered number three in the Top 10 series.

The event began overnight on August 22 when severe thunderstorms developed north of a warm front. The bulk of the storms remained north of Winnipeg, sparing the city from the worst of the event.

The city got a spectacular lightning show, while the cottage-country north of Winnipeg and a few towns northwest of the city took the brunt of the storms. Very large hail fell from Westbourne to Teulon to Matlock to Beaconia to Silver Falls. The largest hail stone reported was 10 cm in diameter, located near Silver Falls. Significant and widespread damage occurred as a result. Locally 40-50 or more mm of rain also fell within an hour, causing overland flooding. The following table gives a chronology of storm reports from the event.

Table: Chronology of storm reports from the overnight thunderstorms of August 22
Approx. Time Location Event
2:00 am Westbourne Nickel to golf ball size hail.
4:15 am Teulon Quarter size hail with significant accumulation. Tree, garden and vehicle damage occurred. 43 mm of rain in 1 hour caused overland flooding. Mounds of hail still remained on the ground hours after the storm.
4:45 am Matlock 5 cm diameter hail.
5:15 am Grand Marais Gold ball size hail.
5:30 am Beaconia Baseball size hail punched holes in roofs and totalled almost every vehicle left outside during the storm. 50+ mm of rain also fell within an hour.
5:45 am – 6:00 am Pine Falls, Powerview and Silver Falls area Nickel to softball size hail. One photo showed a 10 cm diameter hailstone.

Heavy thunderstorms developed again midday in the Red River Valley. Winnipeg was particularly hard hit by these. 50 mm fell in less than 1 hour in parts of the south end. Nickel to toonie size hail, wind gusts to 80 km/h and frequent lightning also occurred, making for quite a storm to remember. Numerous streets and underpasses flooded and some were impassable. Water seeped into and flooded parts of St Vital Mall. Lightning caused a few fires and wind snapped branches.

Rainfall totals from the August 22-23 Storms
Rainfall totals from the August 22-23 storms

The afternoon thunderstorms also dumped some large hail in other areas. Nickel to quarter size hail fell in Oakbank, Winkler and Jessica Lake. Training thunderstorms continued to pummel southeastern Manitoba late afternoon and evening, dumping significant rainfall. Rain from these also spread into the Winnipeg area and Red River Valley. Wrap-around rain around the low pressure system continued to drench south and southeastern Manitoba in the overnight and morning on August 23. Two-day rainfall totals were significant. Widespread totals of 50 to 110 mm occurred throughout the Red River Valley, southeastern Manitoba and the Interlake. In Winnipeg, close to 75 mm fell in southern sections of the city. At Winnipeg airport, about 46 mm fell. 38.4 mm of this fell on August 22 alone, breaking the old record of 38.1 mm in 1959 for the day.

– Warm and Moist Fall

All three fall months (Sep, Oct & Nov) finished in the top 30 warmest on record since 1872 in Winnipeg: September was 6th warmest, October tied 30th warmest and November tied 16th warmest. It was the 4th warmest fall on record since 1872 with an average mean temperature of 7.3°C, tied with 1953 and 2009. Brandon also had a 4th warmest fall on record (since 1890), averaging 6.2°C.

In October, the warmth peaked during the Thanksgiving weekend. Record warmth was seen along the US border with highs near 28°C in Pilot Mound, Morden and Sprague. Winnipeg reached a non-record maximum of 24.6°C on the 11th. Even some weak thunderstorm activity occurred in the evening on the 11th, ahead of a strong low pressure system which produced damaging winds the following day.

A 25-consecutive day streak of above normal temperatures occurred from October 26 to November 19. During this time, 10-consecutive days from October 27 to November 5 never dropped below freezing. Warmth and humidity returned mid November before winter-like conditions arrived. Temperatures exceeded 10°C from the 14th to 16th with a maximum of 13.1°C on the 15th. Unusually high humidity also occurred with dewpoints reaching 9.4°C on the 16th and 9.3°C on the 17th, both record highs and the latest occurrences of dewpoint over 9°C on record since 1953. Thanks to the high humidity, a record high minimum temperature of 5.3°C was achieved on the 16th, the latest minimum above 5.0°C since 1872.

Dewpoint temperatures averaged 3.2°C in fall 2015, t he second most humid fall on record since 1953. November dewpoint temperatures in particular averaged -2.9°C, the highest on record, beating the old record of -3.0°C in 1981.

Thanks to warm conditions, the first accumulative snowfall was on November 18 in Charleswood, Winnipeg’s official station for snowfall. This was the 4th latest first snowfall accumulation of the season since 1872. It was also a month later than the normal of October 18. In addition, no snowfall was recorded in October, only the 16th time this has occurred since 1872.

– Amazingly Warm Start to December

Remarkable warmth started December across southern Manitoba. 8 to 10 days in the first half of the month exceeded the freezing mark in Winnipeg, above the normal of 4 days for the month. 14-consecutive days from the 3rd to 16th never dropped below -9°C at Winnipeg airport, amazing when you consider this was close to the normal high. Temperatures reached 7°C downtown and 4°C at the airport on the 3rd, one of the warmest days of the month. The only record broken during the warm spell was on December 9 when a high of 5.6°C at the airport broke the old record of 5.1°C in 1990.

Morden, MB – Cutting grass in December.
December started with such warmth that the grass still needed to be cut in Morden, MB.

The warmth was most impressive where there was no snow cover. 3 to 7 cm of snow was leftover from November in the Winnipeg area and this limited temperature. Areas without snow cover southwest of the city and in southwestern Manitoba were much warmer. Many locations reached double digits and in some cases more than once. In Morden, four days exceeded 10°C, three of which were record highs. The high of 14.2°C on December 4 was the third warmest on record in December since 1904. Some thermometers reportedly reached 15°C, more typical of late September or early October. No snow was on the ground at the time. A similar milestone was reached in Brandon with a high of 11.1°C on the 4th, the third warmest temperature in December since 1890.

The first half of December (December 1 to 15) averaged -3.0°C at Winnipeg airport, the second warmest first half of December on record since 1872. The warmest was in 1913 with an average of -2.1°C. The month as a whole averaged -8.1°C, tied with 2011 for 9th warmest December since 1872.

State of the Climate: A Look at 2015

Welcome to A Weather Moment’s look back at the weather in Winnipeg for 2015. In this update, we’re going to take a look at how temperature & precipitation developed through the year and how 2015 stacked up against the history books. In another post coming soon, we’ll take a look at the top 10 weather events of 2015!

2015 Stats & Rankings for Winnipeg
Category 2015 Average or Total Rank (since 1873)
High Temperature 10.1°C 7th warmest (tie)
Mean Temperature 4.2°C 9th warmest
Low Temperature -1.7°C 11th warmest (tie)
Rainfall 450.9 mm 38th rainiest
Snowfall 116.7 cm 64th least snowy
Precipitation 529.6 mm 61st wettest

Temperature: Chilly Start With A Mild Finish

With a mean temperature of 4.2°C at the Winnipeg International Airpot, 2015 was the 9th warmest year on record since 1873 in Winnipeg and the warmest since 2012. This was 1.3°C warmer than the 1981-2010 normal of 2.9°C. In addition, daily high temperatures averaged 10.1°C, only the 9th time since 1873 that this value was in the double digits. The graph below shows how each month fared compared to normal and how the year-to-date average changed throughout the year.

Only three months were colder than the 1981-2010 normals: February (-5.7°C), May (-0.4°C) and August (-0.2°C). February was by far the most abnormally cold month, averaging -19.2°C, 5.7°C below normal and the 27th coldest February since 1873. It was also the 3rd coldest February since 1980 and the 11th coldest February in the last century. Only 6 days rose above -10°C, tied 10th least since 1873. Interestingly, it was the 10th colder than normal February in the last 11 years.

Six months in 2015 averaged over 2°C above normal: December (+5.4°C), November (+3.7°C), September (+2.9°C), March (+2.8°C), January (+2.7°C) and October (+2.0°C). There was a streak of four months averaging over 2°C at the end of the year. In fact, the September to December period was the third warmest on record since 1872 with an average of 3.5°C. Only 1931 (avg 4.1°C) and 1923 (avg 3.7°C) were warmer. The 1981-2010 normal is 0.0°C.

Top 10 Warmest Years in Winnipeg (Since 1873)
Rank Average Mean Temperature Year
1 5.4°C 1987
2 5.3°C 1931
3 4.7°C 1878 & 1998
5 4.6°C 2012
6 4.5°C 2006
7 4.4°C 1981
8 4.3°C 1999
9 4.2°C 2015
10 4.1°C 2010

Other stats included:

  • 12 days above 30°C at the airport (normal is 14 days) and 16 days at The Forks
  • 45 days below -20°C at the airport (normal is 53 days) and 33 days at The Forks
  • 3 new record highs (13.2°C on Mar 14, 24.8°C on Apr 15 and 5.6°C on Dec 9) and 3 new record high minimums (21.2°C on Aug 15, 21.0°C on Sep 3 and 5.3°C on Nov 16)
  • NO new record lows or low maximums in 2015

Precipitation: Highly Variable & Above Normal

2015 was a wet year in the Red River Valley. In Winnipeg, 450.9 mm of rain fell at the airport, about 23 mm above normal. This was on the low end of things because many stations inside the city received over 500 mm. 544.0 mm of rain fell in south St. Vital, the rainiest year since 2010. August was the rainiest month with 148.8 mm in Charleswood, 140.5 mm in south St. Vital and 107.8 mm at the airport. The rainiest day of the year in the south end was August 22 with 68.8 mm in Charleswood and 54.5 mm in south St. Vital. September 4 was the airport’s rainiest day with 41.1 mm. These rainy days were the consequence of heavy thunderstorms.

In terms of snowfall, generally 115 to 120 cm or so fell in Winnipeg. This is basically bang on normal. More than a third of this snow fell in December with 44.0 cm, the 12th snowiest December on record since 1872. In fact, about 40 cm fell in just 8 days from December 16 to 23.

Combining rainfall with melted snowfall gives a total precipitation amount for the year. About 530 mm fell in Winnipeg officially, which is within a few mm of normal (note that I use The Forks station in the winter months and the airport station in the warmer months because the airport station underestimates winter precipitation). Again, most parts of the Red River Valley saw much more. 632.3 mm of precipitation fell in south St. Vital, about 80 mm more than in 2014 and the most since 2010. Widespread totals over 600 mm occurred south and southeast of the city. Locally over 700 mm was recorded at some CoCoRaHS stations in the Steinbach area. The higher totals were seen in areas that were hardest hit by heavy thunderstorms over the summer.

Other stats included:

  • 3 new record high rainfalls (31.3 mm on May 17, 38.4 mm on Aug 22 and 41.1mm on Sep 4)
  • 1 new record high snowfall (18.0 cm on Dec 16)

Wrapping Up 2015

Overall, it was a very warm and wet year in the Red River Valley.

The 30-year normal temperature in Winnipeg now stands at 3.0°C (1986-2015 period), tied with the 1984-2013 period for warmest 30-year period since 1872. This means we are currently the warmest we have been in at least 140 years.

It was also an active year for thunderstorms across southern Manitoba with numerous severe hail and tornado events. Stay tuned over the next couple weeks for the top 10 events and stories of the year which will summarize the biggest extremes we saw in 2015.

State of the Climate: Meteorological Winter 2014-15

Daily temperature anomalies this winter (source)
Daily temperature anomalies this winter (source)

This winter has been much easier to handle compared to last year. Despite frigid conditions returning in February, meteorological winter 2014-2015 still averaged close to normal thanks to warm conditions in December and January. The 3-month period averaged -14.3°C, just 0.2°C above normal. This is 6.0°C warmer than last winter!

Meteorological winter rankings for Winnipeg
Category Winter 2014-15 Total/Avg. Rank (Since 1872–73)
High Temp. –9.5°C Tied 42nd Warmest
Mean Temp. –14.3°C Tied 33rd Warmest
Low Temp. –19.0°C Tied 35th Warmest
Rainfall 1.2 mm (est.) 48th Rainiest
Snowfall ~ 43 cm 28th Least
Precipitation ~ 31 mm 9th Driest

Mild & Lack of Snow in December and January

December was the warmest month of the winter, averaging -10.0°C. This was 3.5°C above normal and a whopping 10.9°C warmer than in 2013. Many people would probably remember December for its gloominess however. Several consecutive days of cloud, fog and freezing drizzle occurred. In fact, freezing drizzle fell on 7 days. The cloud kept our daytime highs cooler than they could have been, but helped keep us warm at night. In fact, 3 daily high minimum records were broken. Most notable was a low of -0.5°C on December 12 which broke the old record of -3.9°C back in 1877, Winnipeg’s warmest December on record. Sunshine made more of an appearance in southwestern Manitoba where highs well above zero occurred. Even a few double digit highs were recorded close to the US border. For instance, Deloraine reached 10.3°C on December 11.

There was also a lack of snow in December. Just 7.2 cm fell in Winnipeg, the 16th least snowiest December since 1872. In addition, snow depth never rose above 10 cm. Some areas close the US border even experienced a brown Christmas. The photo below is from Emerson on Christmas Eve morning.

Emerson on Christmas Eve morning
Emerson on Christmas Eve morning

After a cold snap to start 2015, the warmth returned mid January. Temperatures exceeded the freezing mark, nights were unusually mild and what little snow there was on the ground was melting. In the end, January finished 2.7°C above normal, tying with 2010 for 19th warmest. Thanks to melting, snow depth was just 12 cm at the end of the month, the 12th thinnest snow pack at the end of January since 1941.

In total, 11 days in December and January exceeded the freezing mark in Winnipeg, above the normal of 7 days.

February Cold Snap

Winter made its presence well known in February. The month was awfully reminiscent of last year with seemingly endless colder than normal conditions. The month averaged -19.2°C, 5.7°C below normal and the 27th coldest February since 1873. 21 days dipped below -20°C, above the normal of 14 days. The monthly high was a measly -3.1°C. In fact, only 6 days rose above -10°C, tied 10th least since 1873. This February was the 10th colder than normal February in the last 11 years. Since 2005, only 2012 had a warmer than normal February.

Lack of Snow This Winter

Approximately 43 cm of snow fell from December to February (exact amount to be confirmed), about 19 cm below normal. Even more unusual, only approximately 31 mm of precipitation fell making it the 9th driest meteorological winter since the winter of 1872/1873. Now in March, snow depth only sits around 20 cm in Winnipeg.

A Look Back at 2014

I will end this post with a quick look back at the cold year that was 2014. The year averaged 1.2°C, 1.7°C below normal. In fact, it was the coldest year since 1996. Although it was only tied 28th coldest since 1873, it was the 9th coldest in the last century. This was in large part thanks to the very cold winter and spring we experienced.

Monthly & year-to-date temperature deviations for 2014 in Winnipeg, MB
Monthly & year-to-date temperature deviations for 2014 in Winnipeg, MB

As for precipitation, 2014 was slightly drier than normal in some parts of the city and wetter than normal in others. Approximately just less than 500 mm of rain fell officially at the airport, slightly below the normal of 527 mm. It was wetter in southern and southwestern parts of the city where heavy thunderstorms dumped locally flooding rains in the summer. Well over 400 mm of rain fell in these locations. At my place in South St. Vital I recorded 450.0 mm of rain and 550.6 mm of precipitation.

Monthly & year-to-date precipitation amounts for 2014 in Winnipeg, MB
Monthly & year-to-date precipitation amounts for 2014 in Winnipeg, MB. Data combined from the James Richardson International Airport and The Forks.
Overall, snowfall was close to normal with 118.4 cm (normal is 117.3 cm). Nearly 80% of this fell from January to April. As mentioned already, there was a notable lack of snow in December.

Note: Unless otherwise noted, all normals stated in this post are the 1981-2010 normals. I use the normals that I have calculated which you can see anytime by following this link.

Southern Manitoba 2014 Thunderstorm Statistics

This photo of a funnel cloud was taken just southwest of Winnipeg.
This photo of a funnel cloud was taken just southwest of Winnipeg.

Welcome to our summary of the 2014 thunderstorm season across Southern Manitoba! This post will summarize these statistics and compare this year’s thunderstorm season to the last couple seasons. In case you are curious, a brief explanation of how I gathered these statistics can be obtained by following this link.

Thunderstorm Days

The number of days with thunderstorms across southern Manitoba broken down into 6 regions. Includes the date of first thunderstorms and last thunderstorms.
The number of days with thunderstorms across southern Manitoba broken down into 6 regions. Includes the date of first thunderstorms and last thunderstorms.

In total, there were 94 thunderstorm days across southern Manitoba in 2014 (southern Manitoba being defined as the area shaded in the map above). This was slightly higher than in 2013 (89 thunderstorm days) but still much lower than in 2012 (~ 109 thunderstorm days). This is mainly the result of a late spring and thus, a late start to the season in both 2013 and 2014. 2012 featured an early spring with numerous thunderstorm events in March and April. This year, no thunderstorms occurred in March and only 2 thunderstorm days occurred in April. In fact, southeastern, eastern and Interlake portions of southern Manitoba did not see their first thunderstorm until the third or fourth week of May, at least a month later than usual. Winnipeg didn’t get its first thunderstorm until May 20, the 8th latest first thunderstorm on record since 1953.

The distribution of thunderstorm days, as seen in the map above, was fairly uniform across southern Manitoba overall. Similarly to 2012 and 2013, the region east of Lake Winnipeg saw notably less thunderstorm activity.

Interestingly, there was a thundersnow event in January! Although lightning detection products did not record the lightning, lightning was reported by residents west and southwest of Winnipeg on the evening of January 15; more specifically between Carman and Winkler. This was associated with a very strong cold front behind a potent Alberta Clipper. This clipper also brought record winds and high temperatures across the Prairies. Unfortunately, I could not find any data on winter thunderstorm activity in Manitoba historically. The only other occurrence of lightning in January I could find was a report in the Daily Free Press of lightning on January 16, 1876 (Penziwol, 2004). This is not to say that lightning has never occurred in January since then, but that is the only other report I could find. Nonetheless, this year’s thundersnow event was extremely rare for Manitoba.

In Winnipeg, 23 thunderstorm days occurred at the airport in 2014. Although this is the most since 2010, it is still below the normal of ~26–27 thunderstorm days. In fact, we have not had an above normal season since 2007. The last thunderstorm recorded was on September 8, tying for 10th earliest last thunderstorm since 1953. This puts the season at 112 days long, the 5th shortest on record. However, this statistic is a bit misleading. Thunderstorms did occur in southern parts of the city 3 times after September 8, including 2 events in October. I recorded 27 thunderstorm days here in South St Vital this year and the season lasted 156 days.

Severe Thunderstorm Warning Days

The number of days in which severe thunderstorm warnings were issued through 2014 in Manitoba, broken down by forecast region.
The number of days in which severe thunderstorm warnings were issued through 2014 in Manitoba, broken down by forecast region.

In total, there were 34 days with a severe thunderstorm warning issued in southern Manitoba. This is similar to 2012 but much less than in 2013 (45 severe thunderstorm warning days). The first warning was issued on May 24 and the last on September 8, putting the season at 108 days long. This is a tad less than in 2013 (110 days long) and 2012. As has been the case the last few years, southwestern Manitoba saw the most severe thunderstorm warning days in 2014.


The number of days tornado warnings were issued across Manitoba in 2014, broken down by forecast region.
The number of days tornado warnings were issued across Manitoba in 2014, broken down by forecast region.

There were 4 tornado warning days in 2014, half the number in 2013 (8 days) but double the number in 2012 (2 days). The Red River Valley area saw the most. In fact, the warning zone southeast of Winnipeg, which Steinbach is situated in, saw 3 tornado warning days, the highest of all warning zones in Canada this year. However, only one of these warnings actually produced a confirmed tornado (an EF–0 southeast of La Salle on July 26).

From what I could find, 4 EF–0 tornadoes were confirmed in Manitoba this year. However, it is likely that there were more (many go unconfirmed). July 26 was the biggest tornado day of the year with 3 landspout tornadoes confirmed (all EF–0). 2 were in the Interlake near Waterhen and the other was southeast of La Salle.

A tornado might have touched down (unconfirmed) southwest of Winnipeg July 5. Part of the A Weather Moment team (Scott, Matt, Julien & Kyle) watched the storm as it evolved and managed to capture at least 2 funnel clouds. One of these is seen in Matt’s funnel cloud picture at the top of this post. After reporting this funnel to Environment Canada, a tornado warning was issued for the City of Winnipeg.

Monthly Frequency

Thunderstorm-related days per month (thunderstorms, severe thunderstorms and tornadoes) for Southern Manitoba in 2014.
Thunderstorm-related days per month (thunderstorms, severe thunderstorms and tornadoes) for Southern Manitoba in 2014.

For the first time since I started gathering these statistics in 2010, the busiest month of the year for thunderstorm activity across southern Manitoba was in June. The maximum is typically in July, but this year there was an unusual local minimum in activity in July with just 18 thunderstorm days. Residents in southwestern Manitoba were especially hard hit in June with multiple rounds of heavy thunderstorms and rains mid-late month. Over 150 mm of rain fell in the heaviest hit areas in just a period of 2 weeks. 251.6 mm of rain fell in June in Brandon, the rainiest June on record since 1890. 219.8mm of this fell in just the last 12 days of the month. Extensive overland and river flooding occurred as a result, as many of you likely still remember well.

If interested in comparing, follow these links for the 2013 and 2012 graphs: 2013, 2012.

Reference Cited
  1. Penziwol, Shelley. (2004). Storm Signals: A History of Weather In Manitoba. Great Plains Publications. Winnipeg, Manitoba. Page 3.