Tuesday, February 21, 2012
Stormy weather by Friday
There is finally some activity locally on the weather map this morning. First we are dealing with another chilly morning at -11C here on L'Ile Perrot southwest of downtown Montreal. High pressure will keep skies clear today with just some increasing high clouds. A frontal system with limited moisture will approach from the Great Lakes tonight and produce a few flurries and showers into Wednesday. It will be mild with temperatures above freezing today and for most of the week. A stronger storm will move from the Ohio Valley late Thursday and down the St. Lawrence Valley by Friday. This system will be the strongest this month with the chance for up to 25mm or 1 inch of precipitation. The problem is what form of precipitation can we expect? At this time is looks like rain from metro Montreal south and a mix of rain, freezing rain or snow north with precipitation tapering off to all snow by late Friday as a strong cold front sweeps the region. Forecaster confidence is very low at this point as the two most reliable computer models argue with each other over the eventual details of the storm. In any event there will be some stormy weather Friday after what has been a very inactive month.