It will be a wet week in Montreal and across the entire region as a frontal boundary becomes the pathway for several low pressure areas. The first will begin to affect the Montreal region tonight, but before that we have a partly cloudy and mild day with highs near 12C (54F). We start the day at 4C here on L'Ile Perrot after a few showers Sunday. Rain will move into the region again tonight and taper off by noon on Tuesday. I expect about 15mm through the period. More rain is forecast to arrive by Wednesday and that will last into Friday. There may be a little wet snow on Friday but it does not look like much at this time. Winds will be gusty late in the week.
Today low pressure is getting organized in the Rockies, and this system is expected to generate a significant spring snowstorm over portions of the high plains and Rockies, including Denver. A rapid weather change is forecast in Denver with highs of 18C (65F) today dropping well below freezing by Tuesday with heavy snow and strong winds. I have seen this happen first hand when I was in Saskatchewan and it is quite a shock to the system. In the spring of 1999 in Gravelbourg during May of all months, we went from the mid 20's down to below freezing in less than 12 hours with rain changing to wind driven snow.The same storm system will generate strong thunderstorms with tornadoes and hail over the central and southern plains from Missouri to Texas.
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