Convective discussion
This morning’s analysis is showing an upper cold low over the northeast coast of Newfoundland with a vast cloud deck extending southward to the south coast of the island. The upper air sounding indicates plenty of instability in the low to mid levels to produce widespread towering cumulus and showers. Limited daytime heating will produce enough energy (CAPE values between 250-500 J/kg) to generate an isolated cumulonimbus over the areas where the southern edge of the cloud deck lies.
Regional impacts
Newfoundland and Labrador: Risk of isolated non-severe thunderstorms over Connaigre, Burin Peninsula, Clarenville and Terra Nova. Brief downpours, small hail and wind gusts 50 km/h.
New Brunswick: No thunderstorms expected.
PEI: No thunderstorms expected.
Nova Scotia: No thunderstorms expected.
Jean-Marc Couturier