Severe Thunderstorm Watch

A severe thunderstorm watch is in effect for southern Quebec including Montreal until 9pm this evening. A slow moving frontal boundary combined with warm, humid and unstable air, is the focus for heavy storms this afternoon. Most of these storm cells are moving very slowly and producing heavy rain in a short period of time. Several storms are affecting the region between Valleyfield and Morrisburg, Ontario at this hour with up to 50mm of rain possible. Warnings have been issued by Environment Canada for this area. These particular cells are drifting slowly northwest and should not affect the metro region. Others are developing over the central portion of the island and south towards the US border.

Storms are also occurring south of the border in New York and Vermont. One cell produced 1.32 inches of rain in 30 minutes in Saranac Lake. A flood advisory has been posted by he National Weather Service for Franklin, Clinton, Essex and St. Lawrence Counties.