Tropical air mass with thunderstorms for Montreal

Strong thunderstorms move across L'Ile Perrot on Monday afternoon. The storms produced 7mm of rain here on the island and toppled some trees. (ValleyWX)

It is a very warm and sultry Tuesday morning here on L'Ile Perrot with temperatures already in the mid 20's and high humidity (24C with a humidex of 25C). Dew points are in the low 20's across Ontario and Quebec making it feel quite uncomfortable outside. We did get some relief on Sunday after highs reached 30C at Trudeau and easily over 30C (86F) most other places including 31C here on L'Ile Perrot, and 32C (90F) at St. Anicet. The heat generated a line of strong thunderstorms late in the afternoon that produced hail in the Ottawa Valley and then moved towards the St. Lawrence Valley and points south. The storms created widespread power outages in Quebec with 30,000 customers in the dark. It also kept the Montreal Fire Department busy with numerous calls for downed trees and power lines. The storms prompted a tornado warning for Thetford Mines, we will see later this morning if Environment Canada can confirm one or not.

Winds gusted to over 50km/h in Montreal and most certainly higher locally. The storms also caused a serious accident on Interstate 89 near Burlington, Vermont last evening. Three vehicles and a tractor trailer collided in the heavy rain sending the truck over the edge of a overpass and into the Winooski River seriously injuring the Quebec driver.

Today we will see a repeat of Monday with warm and humid temperatures reaching near 30C across the region. Clouds will increase with rapidly developing thunderstorms late this afternoon across eastern Ontario and into southern Quebec, New York and Vermont. They could be severe once again, and a watch or warning may be issued.