April ends on cool damp note as below normal streak continues..

Same story.. different month
Below normal temperatures dominated
in April, much like March and February

A cool damp day over Winnipeg and southeast Manitoba marked an appropriate end to the month of April, which will end up as the 7th straight month below normal in Winnipeg. The month will finish with an average temperature of +0.3C, over 4C below normal for April (1981-2010 normal April average of +4.4C), making this the 19th coldest April on record since 1872, tied with the Aprils of 1962, 1888, and 1877.  This follows the 19th coldest March and 21st coldest February, so we've had top 20 type cold weather for 3 straight months now. And it doesn't look like the weather pattern will be changing anytime soon as a persistent upper trough over central North America maintains cooler than normal weather over southern Manitoba through the first week of May at least. Normal highs for Winnipeg are now 16C and will climb to 19C by mid May and 22C by the end of May. If we can even get back to a normal weather pattern by mid May, we would be seeing more frequent and persistent 20C weather. Winnipeg has yet to hit the 20C mark this year, and has hit the 15C mark only once with a high of 15.1C on April 23rd. But there have been worse starts to May.. such as 1979 which saw single digit highs for the first 11 days of the month along with snowflurries almost each day, and a 7 cm snowfall on May 10-11th. Whatever the case, residents of southern Manitoba are eager for a pattern change.. which hopefully comes by the beginning of summer.

Latest dates that Winnipeg first reached 20C (data since 1872) 

1.   May 25 1907
2.   May 21 1956
3.   May 18 1996
4t.  May 17 1935, 1967
6t.  May 16 1883, 1892, 1979
9.   May 15 1884
10. May 14 1902

Source: Environment Canada

Another round of wet weather moving into southern Manitoba Sunday night through Monday

RDPS model valid midday
Monday Apr 28th
showing widespread precip
from US storm system

After a brief break this weekend, another round of wet weather will be moving into southern Manitoba Sunday night into Monday as a large storm system south of the border spreads widespread rains northward. Rain from this system will be pushing into the southern RRV and SW Manitoba by late Sunday into Sunday evening, reaching Winnipeg during Sunday night. Rain will continue through Monday before tapering off Monday night. Rainfall totals of 15-25 mm will be widespread across southern Manitoba with amounts of 30 to 40 mm possible over portions of the southern and western RRV into southwest Manitoba. In addition, precipitation could even be mixed with wet snow over western Manitoba Sunday night into Monday morning with slushy accumulations possible over higher elevations. Drier but cool weather is forecast through mid week with temperatures running some 5-10C below normal for the end of April. Unfortunately, there are still no signs of a major pattern change to above normal weather for us into early May.

Wet weather moving in for mid week..

More typical springlike weather has finally become established across southern Manitoba as the winter snowpack has pretty much disappeared across most areas. This is allowing the late April sun to warm up the surface more easily, with temperatures reaching more seasonable values now.  Tuesday looks to be a beautiful day with lots of sunshine and temperatures reaching the mid teens.. pretty much normal for this time of year. The nice weather however will be short lived as a large storm system developing over the western Prairies brings a widespread area of rain across southern Manitoba during Wednesday, reaching Winnipeg by late afternoon or evening. Rain will become steadier and heavier Wednesday night, with a good soaking of 15 to 25 mm possible through Thursday, likely our most significant rainfall since last October. Rain will taper off Thursday night, possibly changing to some wet snowflurries by early Friday as colder air works in behind the system. Cooler than normal weather will follow in the wake of this system through the weekend into early next week. This will ensure that April finishes below normal by a good 4-5C, the 7th straight month that has ended up below normal in Winnipeg. The last month that was above normal here was last September which finished 2.5C above normal. Hopefully, May can finally break the below normal streak..    

Record cold possible this week before warming trend for Easter holiday weekend..

Well below normal temperatures will once again flood into southern Manitoba over the next few days in the wake of yesterday's storm system that brought snow, ice pellets and patchy rain or drizzle across the area. Temperatures are expected to remain below freezing through Thursday before milder weather moves in by the end of the week. Temperatures for the first half of the week will be more typical for early March than mid April, with highs around -5C and lows near -15C, well below normal for this time of year (normal highs are now +10C, normal lows -2C)  In fact, some record low maximum and minimum temperatures will be challenged this week in Winnipeg, especially Tuesday and Wednesday.

Record temperatures for Winnipeg this week.

DATE.........    REC LOW MIN ........... REC LOW MAX ..... Forecast low/high this week

Mon Apr 14 ....  -16.7C  (1893) .......   -7.8C (1880)  ............  -14/-6

Tue Apr 15 .....  -16.7C  (1893) ........  -6.7C  (1875) ............   -17/-6

Wed Apr 16 ....   -16.7C  (1875)  ......  -4.4C  (1910) ............  -13/-5

Thu Apr 17 .....   -13.3C  (1953) ........  -3.3C (1953)  ............  -12/-2

Normals for the period: High +10C, Low -2C.

  

Note that Winnipeg has never recorded a temperature colder than -15C after April 16th so temperatures this week represent some of the coldest weather on record for so late in the year here. The good news is that there are signs of a significant warmup by the Easter holiday weekend, with temperatures climbing to double digit values again. We can only hope the latest cold spell this week is winter's last hurrah after what has been a much too long stay this year. Over the past 11 weeks, Winnipeg has seen only 10 days above normal. The graph below shows daily temperature departures for Winnipeg over the past 90 days, which clearly shows an overly persistent pattern of well below normal temperatures since late January (in fact, since the beginning of December)  We're well overdue for a pattern change..

Daily temperature departures for Winnipeg over
the past 90 days. Mother Nature needs a major reboot

Like it or not.. here comes the snow..

640 am Woodlands radar and webcam images
showing progress of snow across
southern MB early this morning

The latest bout of winter is on its way across southern Manitoba this morning with snow spreading into areas west of Portage La Prairie as of 7 am. Snow will continue to advance east this morning, reaching Winnipeg by mid to late morning. Snow may become heavy at times, with amounts of 5 cm possible by mid afternoon, although some areas could see 5-10 cm in heavier bands. Heaviest snowfall amounts are expected over higher terrain northwest of Portage La Prairie where 10-15 cm is expected today.

Follow this blog, my webcam page, MB highways, and AWM radar to keep track of this latest bout of wintery weather.

UPDATE: Snowfall reports from April 12th

Mafeking ............ 22 cm  (north of Swan River)
Cowan ............... 18 cm  (east of Swan River)
St Claude ............ 15 cm (south of Portage La Prairie)
Rossburn ............ 14 cm (southwest of Riding Mtn Park)
Carman .............. 10 cm
Brandon .............. 5-10 cm  (5 cm at YBR airport)
Neepawa ............  9 cm
Miami .................  9 cm
Gilbert Plains ....... 8 cm
St Alphonse ........  7 cm (south of Spruce Woods Park)
Portage LP .........  7 cm
High Bluff ............  7 cm (east of Portage La Prairie)
Morden ................ 6 cm
Winkler ................ 5 cm
Pinawa ................. 5 cm 
Marquette ............ 5 cm (east of Portage La Prairie)
Stony Mtn ............ 4 cm
Winnipeg .............  2 cm  (5 mm melted precip with ice pellets, rain and drizzle)