Convective Discussion
Isolated thundershowers are occurring west of Labrador (halfway to James Bay) again this morning. This activity should slowly move eastward during the day. Cumulus clouds are becoming more widespread over central and eastern Labrador. Isolated thunderstorms will likely develop especially over higher terrain.
Technical Discussion
The cold pool associated with the upper low northeast of Labrador will continue to support convective clouds today. The main focus will be over southeastern regions where surface temperatures will reach 25. Convection will be enhanced by higher terrain especially south of Lake Melville. Moisture in this airmass is limited so the main threat would be brief high winds (gusts around 70km/h or even a little more are possible).
To the west, a low over northern Ontario with a warm front extending eastward continues to support some elevated convection with a help a weak (80kt) anticyclonic upper jet. Some of this dynamic might approach western Lab late in the day but the prime area for surface-based convection will likely remain south of the frontal feature (and out of Lab) where higher wind gusts appear to be the main threat.
Regional Impacts
New Brunswick, Prince Edward Island, Nova Scotia and Newfoundland
Nil.
For Labrador
Lightning and possible gusts for eastern Labrador.
Jean-Marc Couturier