Tuesday, May 13, 2014

Clouds showers and thunderstorms for Montreal

There is no snow in baseball! Coors Field home of the Colorado Rockies in the snow on Monday. (Rockies Twitter post)
A very weak backdoor cold front has slipped south across the St. Lawrence Valley this morning introducing a cool northeast wind in Montreal. A backdoor cold front is simply a boundary of cooler air moving from northeast to southwest, opposite of their typical movement in southern Quebec.The air behind the front is of marine origin, damp and cooler Temperatures are down from the low 20's we had Monday afternoon, sitting at 9C (48F) this morning on L'Ile Perrot.

That front has very little moisture associated with it but has brought lots of cloud cover along with a maritime air mass. Clouds will prevail for the day and for most of the week, temperatures will be cool today at 17C (63F). The front will wash out later today over New York state setting up a wind shift to the southwest and bringing back warmer air for Wednesday and Thursday. Temperatures will be in the mid 20's both days with perhaps 27C if see a peek or two of sun. By Thursday a very slow moving cold front will produce showers and thunderstorms across southern Quebec and Ontario, lasting into the start of the long Victoria Day weekend. Thunderstorms will be more numerous today across southwest Ontario closer to the warmer and more humid air currently over the southern US. Some of the storms may be severe in nature with hail and high winds being the main threat especially from London to Windsor. Meanwhile snow is falling over northwest Ontario with 5cm in Kenora. The snow has finally come to an end in Denver and portions of Colorado and Wyoming. From 1-3 feet of snow fell across the region with less in the metro area of Denver. The good news is that highs will be close to 27C (80F) by the weekend.

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