Thursday, June 27, 2013

Heavy rain event for Montreal & New England

Epic temperature battle
Yesterday was a battle of wind directions in Montreal. The day started with a warm southwest wind but quickly changed as a marine air mass moved southeast down the St. Lawrence Valley. The air mass was so chilly that on Tuesday evening Quebec City fell from 28C (83F) to 17C (63F) in one hour. Quebec City struggled to make it to 14C yesterday. Meanwhile Montreal in the warm and muggy air saw temperatures rapidly rise to 23C yesterday before the northeast wind arrived in the city putting a cap on highs for Wednesday. Temperatures on the east end of Montreal Island settled in at only 18C (65F) while in the southwest corner of the province St. Anicet was 29C (85F). Southwest winds slowly won over in Montreal with temperatures eventually making it to 25C (77F) late in the day.

Most of the day was cloudy but some breaks late in the day on L'Ile Perrot produced enough fuel to generate a decent thunderstorm around 8:30pm. The storm clipped my region before moving south into the US. About 7.2mm of rain fell in 10 minutes at my home, but only a trace at the airport.

Projected rain amounts for Friday from WPTZ 5 Plattsburgh, NY.
Flood Watch
A flood watch is now in effect for all of northern Vermont and most of upstate New York excluding the St. Lawrence Valley. A very moist weather system will lift north into New England on Friday with heavy rain and thunderstorms. The rain should begin late tonight and last all day Friday. Impressive amounts of 2-4 inches are likely in New England wit 25-50mm (1-2 inches) in southern Quebec. A warning may be needed for portions of our area as well. The rain is falling on already saturated soil and full rivers. Flooding is anticipated across many areas of the Adirondacks and Green Mountains. Unsettled humid weather is forecast for Ontario and Quebec well into the holiday weekend with more showers and thunderstorms.

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