A break in the humidity for Montreal

NOAA image of Tropical Storm Claudette located well east of Delaware, over the Atlantic Ocean, late Monday.

 Monday was the warmest day of 2015 across southern Quebec and finally featured our third 30C high for the city  this year, 30.1C at Trudeau Airport. Other reporting stations across the region had highs well into the 30's including 32.6C on L'Ile Perrot, 31.2C in Cornwall and St Anicet and 30.6C in Ottawa. Downtown Montreal was scorching with several locations showing mid-afternoon highs greater than 32C (90F) and humidex values close to 40C. Temperatures remained very warm overnight with lows from 21 to 23C (70 to 73F) across metro Montreal. Scattered thunderstorms Monday afternoon affected mainly the area from Valleyfield east to Granby and south to the US border. A much more widespread shower and thunderstorm event will develop later today as a cold front slices into the warm and humid air. High temperatures will reach 30C (86F) again today before the front arrives after sunset. Thunderstorms this afternoon and tonight have the potential to produce very heavy rain in a short period of time. Overnight storms have already produced flash flooding across western New York. By Wednesday, expect a break in the high humidity with clearing skies and pleasant highs of 24C (76F) in Montreal. The fair weather will hold into Friday.

Environment Canada forecast track of Tropical Storm Claudette into Newfoundland on Wednesday. 
(Canadian Hurricane Centre)

Tropical Storm Claudette
The third tropical system of the 2015 season formed well east of the Carolina's late Sunday. Claudette developed over the warm waters of the Gulf Stream. This morning the system is located approximately 500km south of Halifax, Nova Scotia, and moving northeast at 20mph. Claudette is expected to slowly weaken and become a post tropical cyclone later today as she heads towards the colder waters around Newfoundland on Wednesday. Gusty winds, a period of steady rain and rough seas will affect the south and east coast of Newfoundland as well as Sable Island, with just some wave action expected elsewhere in eastern Atlantic Canada.