Deep low pressure over the Ohio Valley is forecast to move north towards Michigan this week. Rain is already moving into southern Ontario with a warm front associated with the aforementioned storm. The rain will push north and east towards Ottawa, Kemptville and eventually Montreal. The precipitation will become heavy at times Monday night and Tuesday before tapering to showers on Wednesday. Amounts should be impressive with 15-30mm expected. Winds will be a factor with this storm as well, gusting out of the northeast from 30-60km/h in advance of the storm and eventually backing to the west and gusting over 60km/h.
Some snow is occurring on the back side of the storm over northwest Ontario. 5cm fell at Thunder Bay overnight. In the southeast US the system produced sever thunderstorms and tornadoes yesterday.
The end of the week will see some clearing and much milder temperatures. Highs by Friday could be close to 20C in the St. Lawrence Valley.
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