Unsettled week ahead

Labor Day Weekend has come and gone and now meteorologically speaking, we are into the Fall season. However you could not tell that by this weekends weather and this morning's temperatures as Montreal is already at 21C (70F). We enjoyed sunshine for most of the holiday weekend with highs well above normal over 27C (80F).

Tropical moisture from the remains of Isaac as well as a frontal system will start to impact southern Quebec today with showers developing at anytime. The showers will increase in coverage late today as low pressure slides across southern Vermont. The heaviest rain will be confined to New England where 1 to 2" (25-50mm) are expected. Those amounts will taper of sharply in Ontario and Quebec with no more than 13mm (0.5") expected at this time. The balance of the week will remain rather muggy with scattered showers and perhaps a thunderstorm. Temperatures will remain in the mid 20's for daytime highs and upper teens for overnight lows. The normal high/low for Montreal for this date is 22/11C (72/52F).

Heavy rain floods neighborhoods just north of  downtown Washington DC on Sunday night. More flooding is  possible today as tropical moisture from Isaac hangs around. (Washington Post)

As mentioned the tropical moisture from what is left of Isaac is moving across the eastern US today. Heavy rain is forecast across Washington DC northeast into New York City with isolated flash flooding possible.