Hot with strong thunderstorms possible for Montreal

Happy Canada Day.

We are warm and very humid this morning in Montreal as temperatures start the day in the mid 20's. Currently I have 25C on L'Ile Perrot but with an 83 per cent humidity, it feels quite uncomfortable. A heat warning is in effect for eastern Ontario and southwest Quebec. Temperatures will warm under hazy sunshine to 33C (92F) today with heat index values close to 38C (100F) for metro Montreal and the surrounding region. As always try to limit extreme outdoor activities and drink plenty of water. Temperatures will remain warm tonight, dropping to 23C and warm again on Wednesday at 30C. It should turn cooler and less humid by Thursday.

SEVERE THUNDERSTORMS
The other threat today will come in the form of strong thunderstorms. A cold front moving into Ontario and Quebec will trigger these storms, and with plenty of moisture and energy available they could be quite strong. The threat will begin early this afternoon in western Quebec and Ontario, and spread towards metro Montreal by the supper hour. Already this morning a severe thunderstorm watch has been posted north and west of Montreal. With today being a holiday and many outdoor activities scheduled, it is important to be aware of any potential severe weather and warnings that may be issued later today for Montreal. The main threat will be strong winds and possible hail. There is also the risk of an isolated tornado in regions northwest of Montreal and across southern Ontario.

The current forecast track of Arthur may take it towards Nova Scotia by the weekend. (NHC)

Tropical Storm Arthur
Forecasters at the National Hurricane Center in Florida are tracking the first tropical system of the young 2014 season in the Atlantic basin. Depression one will likely become tropical storm Arthur today as winds reach 39mph. The storm is forecast to slowly develop just off the US southeast coast. It is forecast at this time to remain just offshore with heavy rain (3-5 inches) and rough surf expected on the coast from northeast Florida to North Carolina. The potential is there for Arthur to become a hurricane by the weekend near the Outer Banks. We will have to watch this system closely as the potential also exists for some weather to affect Atlantic Canada by the weekend. At this time the New England beaches look to be spared from a direct hit, however the surf will be rough.