Wednesday, 24 December 2014

Wet and windy Christmas for Montreal

The storm system that will be responsible for our wet and windy Christmas in Montreal, spawned several rare December tornadoes Tuesday from Louisiana to Mississippi. (WDAM News)
WIND WARNING METRO MONTREAL: Southwest winds 60-100km/h Christmas Day.

It looks like those of you who wanted a wet and green Christmas will have your wish come true. Rain is falling across the northeast and southern Ontario into Quebec on this Christmas Eve. Low pressure is lifting north from Mississippi towards Lake Huron. Mild air will surge north into our region guaranteeing rainfall for the next 24 hours. The rain combined with snow melt will produce some localized flooding. There may even be a thunderstorm is some locations especially in Ontario. Temperatures will warm from current readings around 5C (41F) up to 10C (50F) by Christmas morning in Montreal. The high temperature record for today is 8.3C (47F) set in 1957, that one should be ok, but we have a shot at the warmest Christmas record high of 11.7C (53F) set in 1964.

Besides the 25mm (1 inch) of rain expected in the St. Lawrence Valley, winds will increase sharply on Christmas morning in advance of a cold front. Southwest wind gusts to 80km/h are possible in Montreal with 100km/h possible in Ontario. Warnings will likely be posted later today for that element. The wind could lead to power outages or some trees toppling. Skies will clear for Boxing Day with a cooler high of 3C (38F), still well above normal. Unsettled weather returns over the weekend with a chance of rain or snow and then snowy and much colder into the last week of 2014.

This same weather system spawned severe thunderstorms and tornadoes on Tuesday along the Gulf Coast from Louisiana to Mississippi. Thousands were left without power and numerous buildings were damaged or destroyed. Sadly, 4 fatalities and multiple injuries were reported in Columbia, Mississippi. Severe weather will stretch from Florida to the North Carolina today with thunderstorms possible as far north as New York and Ontario.

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