Fairly typical mid to late spring weather pattern for this week across the U.S. and Canada with the usual swings in temperature and numerous fronts.....
--There is the potential for strong thunderstorms with possible hail and damaging winds Tuesday afternoon and evening over extreme southeastern Saskatchewan and especially southwestern Manitoba as very warm and more humid air tries to move in.
--A potent upper-level low will track from southern BC to central Alberta Wednesday into Thursday. This system has the potential to bring a period of significant rainfall to western and southern Alberta Wednesday into early Wednesday night. In addition to the rain, there could also be some lightning, but severe storms are not anticipated at this time. The good news is that this system will be moving along and weakening Wednesday into Thursday, which will limit the duration of heavier rainfall and reduce the threat of flooding.
--Farther east, the atmosphere will become more unstable with the approach of warm, humid air into southern Saskatchewan. There is the potential for another round of heavy thunderstorms over southern Saskatchewan Wednesday night.
--The warm, humid air will likely get into extreme southern Saskatchewan and southern Manitoba on Thursday with highs likely getting above 27 C. Just to the north, along the frontal boundary there will be more thunderstorms.
Hudson Bay ice cover
The NASA MODIS high resolution satellite image from yesterday shows most of south Hudson Bay covered with ice, with thinner, broken areas now visible in the southeastern quadrant.
It appears the spring melt is pretty much on schedule in this region according to the Canadian Ice Service which shows last week's ice coverage over the Hudson Bay region was near 76 percent, or just running slightly above normal.
On average, the Hudson Bay region, including the Hudson Strait, does not lose all of its ice until September.
The last of the ice is melting along the south shores of Lake Superior now. To no surprise, lake water temperatures are running about .5 to 1 degree C below normal for the Great Lakes as a whole.
The second sea surface temperature anomaly image below shows the current anomalies surrounding all of North America. Note how expansive the warmer-than-normal waters are in the northeast Pacific.
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Storm will bring blizzard conditions to parts of New Brunswick and P.E.I. by early Thursday morning.
Intense, quick-moving storm will bring heavy snow and strong winds to the Maritimes later Thursday and Thursday night.