Elsewhere in Weather News: February 23rd, 2013

Major Snowstorm Hits US Plains

Another trough digging through the southern half of the US this past week, caused trouble for travellers and residents of the Great Plains. Moist air from the Gulf of Mexico made its way north into Kansas which fell as freezing rain and snow ahead of the warm front. In the warm sector a line of thunderstorms, some severe, formed along the trough line that plowed through part of Texas and Louisiana.

850mb analysis

850mb analysis of early Wednesday morning. Heavy snow was already falling at this time. Highest accumulations circled in pink. (Source: Twisterdata)

Highway conditions quickly deteriorated after snow started falling and 150km of I-70 had to be shut down in Kansas due to many vehicle accidents. This system also prompted the closure of schools, delayed flights at airports or even closed airports such as the Kansas City airport. This same trough is to be blamed for suspending play at the PGA in Marana, Arizona where an uncommon sight could be seen; snow – about 4cm of it, covered luscious greens with cacti nearby in the background.

Snow affecting PGA

PGA golfers leaving the course while it’s snowing. (Source: AP)

Snowfall rates of 3-5cm/h were not uncommon for several hours in Kansas and Nebraska and contributed to significant snow accumulations. Highest accumulations were just below the two foot mark (60cm) in south-central Kansas with a good part of Kansas receiving over 20cm of snowfall. Most of the Southern Plains residents welcome any type of precipitation at this time however due to a severe/extreme drought is currently in place through much of the Plains (as talked about in last week’s EIWN). Last Thursday’s storm should at least make for slight improvements in the short term drought index but for longer range improvements the Plains need to get out of a persisting dry pattern.

Recent model runs show another major snowstorm, with as much as another foot of snow, Sunday night into Monday for the US Plains.

Beautiful Weekend Ahead

It’ll be a great weekend to get out and enjoy outdoor activities as we see little in the way of weather and seasonal temperatures.

Friday

Mix of sun and cloud.
-7°C / -14°C
Saturday

Mainly sunny.
-7°C / -14°C
Sunday

Becoming cloudy, chance of patchy flurries.
-6°C / -10°C

There isn’t much to say about the next few days; today and tomorrow will be pleasant with clouds slowly clearing out and daytime highs near –7°C. Overnight lows will sit around –14°C for the next couple nights. There will be increasing cloudiness as a warm front approaches on Sunday bringing with it a slight chance of some patchy flurries and a high temperature around –6°C. The overnight low on Sunday will only be –10°C as warmer air moves in.

Next week looks to be off to a very pleasant start with above-normal daytime highs of about –5°C and no significant weather expected through the first half of the week. Long-range models hint that we may cool down back to seasonal or just below seasonal temperatures for the second half of the week.

Have a great weekend and get out there and enjoy the nice weather!

A Return To Seasonal Weather

After a surprisingly cold day yesterday, we’ll be quickly returning to seasonal temperatures over the next couple days with little weather to worry about.

12hr. QPF valid Thursday at 18Z

12 hour precipitation accumulation from the RDPS model valid near lunch time on Thursday. The RDPS is forecasting roughly 1–3cm of snow over Western Manitoba as a cold trough lingers over the area.
Wednesday

Increasing cloud.
-17°C / -20°C

Some cloud will push in today as another disturbance begins to push into the region but our highs will still remain below normal, sitting at about –17°C for most of the Red River Valley. Winds will remain fairly light out of the south through the day. Temperatures will drop only a few degrees tonight to about –20°C thanks to lingering cloud cover.

Thursday

Thursday

Becoming cloudy.
-10°C / -15°C

We’ll see a return to normal temperatures Thursday as warmer air continues to work it’s way into Manitoba. Highs will sit near –10°C under a mix of sun and clouds. The cloud will be from a system to our west which is not expected to impact the Red River Valley but will bring some light snow to southwestern Manitoba. Skies will remain fairly cloudy overnight as we drop to –15°C.

Friday

Friday

Mix of sun and cloud.
-9°C / -13°C

Friday will once again bring a mix of sun and cloud. Almost a carbon copy of the day before, our daytime high should get up to around –9°C. Temperatures will drop to only about –13°C on Friday night as we head into a pleasant weekend with seasonal temperatures of around –8°C expected and little chance of snow.

Enjoy the return to seasonal temperatures and get out there and enjoy Festival du Voyageur or go for a skate down on the river! If you didn’t see it yesterday, be sure to check out our special post yesterday summarizing the Louis Riel Day blizzard.

Special: Louis Riel Day 2013 Blizzard

Louis Riel Day was marked this year by a significant blizzard that brought much of the Red River Valley to a standstill. While snowfall was relatively light, with only 5–10cm reported in most localities (although a few pockets of 10–15cm did exist through the Southern portion of the Red River Valley), strong northerly winds that gusted as high as 70–80km/h produced blowing snow that gave whiteout conditions through most of the Valley.

Warm Front on Sunday, February 17

This system was marked by a warm frontal passage on Sunday near noon. Strong southerly winds brought local blowing snow to the region as an area of precipitation blossomed along the warm front. Here in Winnipeg, the precipitation fell as ice pellets first before switching to snow. Further south, a little deeper into the warm air, moderate band of freezing rain developed, coating Steinbach, as well as Highway 1 East, Highway 52 and Highway 59 in a layer of ice.

Freezing Rain in Steinbach 1

Freezing rain accumulating in Steinbach. Credit: @andrewpenner78

After this band went through, then winds slowly died off and we were able to enjoy a relatively nice afternoon. Near Steinbach, however, there were reports of numerous cars in the ditch due to “skating-rink”-like road conditions.

Cold Front and Blizzard, Sunday/Monday February 17/18

The cold front associated with this system passed through Winnipeg between 6–7PM CST; winds switched from southerly to calm to northerly and cloud ceilings rapidly dropped to 300–400 feet and a few hours of freezing drizzle happened in the low-level mixing immediately behind the cold front. By 10:30, winds began to pick up and the freezing drizzle switched over to snow. By midnight, visibilities had dropped to ½SM and would stay there or worse until roughly noon on Monday. To our south, conditions remained practically a white-out for an additional 6–7 hours, with visibilities not lifting above ¾SM until 7PM CST as sustained winds of 50–60km/h battered the area.

24 Hour Rainfall Accumulations

24 Hour Precipitation Accumulations

In total, around 3–6cm fell in Winnipeg, with areas on the south side of the city receiving nearly twice that of the central/northern portion. South of Winnipeg, snowfall amounts were appropriately higher:

  • Winnipeg: 3–6cm
  • Morden: 8cm
  • Morris: 10cm
  • Pinawa: 8cm
  • Steinbach: 11–13cm

As winds abated, colder air began working into the region. The temperatures have been on a downward trend all the way from Monday morning to the time of publishing this; temperatures are beginning to level off at –27°C.

Impacts

Twitter was a great source of information for what was happening during this event; between weather reports flooding in on the MBstorm hashtag and immediate communication about road conditions, it was relatively easy to get a grip on the significance of this system.

Some pictures came in early on Sunday as the band of freezing rain pushed through Steinbach:

Freezing Rain in Steinbach 2

Freezing rain accumulation on a car in Steinbach. Credit: @andrewpenner78

As the winds picked up, blowing snow quickly became the predominant impact over the Red River Valley:

Snow Drifts in Niverville

Snow drifts rapidly growing in Niverville. Credit: @jim_311

Some truly impressive images came out of Winnipeg Beach on Monday morning:

Snow Drifts in Winnipeg Beach

Massive snow drifts in Winnipeg Beach. Credit: @annhogie

Massive Snow Drifts in Winnipeg Beach

Massive snow drifts in Winnipeg Beach. Credit: @annhogie

Massive Snow Drifts in Winnipeg Beach

Massive snow drifts in Winnipeg Beach. Credit: @annhogie

Conditions on highways were fairly brutal on Monday:

Blowing snow on Highway 311

Blowing snow on MB Highway 311. Credit: @jim_311

Blowing snow Near Emerson, MB

Blowing snow in Emerson, MB.

Even within cities in the southern Red River Valley, conditions got quite bad:

Blowing snow in Winkler, MB on Monday morning.

Blowing snow in Winkler, MB on Monday morning.

Many highways were closed for this event:

  • Highway 16 from Hwy. 50 to Hwy. 466
  • Highway 1 West from Portage to Winnipeg
  • Highway 75 from Winnipeg to the US Border; I–29 from the US Border to Grand Forks, ND
  • Highway 5 from Neepawa up to St. Rose.

Numerous traffic accidents occurred as well, keeping the RCMP quite busy:

  • A 10-car pileup occurred in St. Francois Xavier that involved several semi-trucks. No injuries.
  • 3 semi-trailer trucks collided on Highway 1 west of PR 332.
  • Two semis smashed through road barricades in Headingly. A police cruiser was damaged by debris but nobody was hurt.

Perhaps most tragically, one man died in this storm. A 54-year old man was found dead near Landmark. He had left his car after driving into the ditch on road 45N. The road was slippery and visibility was near-zero at the time.

This was a very significant blizzard that had huge impacts on the Red River Valley. Fortunately, residents had plenty of time to prepare as Environment Canada issued special weather statements on Friday morning addressing the potential for a significant blizzard and carried them through to the issuing of warnings.

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