Regional Impacts
Today: scattered to numerous thunderstorms for a portion of Labrador giving locally strong wind gusts, small hail and brief downpours. A risk of a thunderstorm for central/northeastern NL giving brief downpours and gusty winds.
Friday: slight risk of a thunderstorm across most of Labrador.
Convective Discussion
Looking like an active day up in the Big Land with non-severe thunderstorms expected. Looking at the 12Z tephi out of YYR the convective temp will be reached for most areas before lunchtime, and sure enough lightning is being detected as I type this up. The freezing levels are low, the shear is relatively weak (just ahead of the upper low), and the instability is only modest which all point to nothing reaching severe limits. Even the PWATs are below 20 mm, but locally strong wind gusts to 70 km/h, small hail and heavy rainfall will likely occur in the stronger cells. There will also be a risk of a thunderstorm this afternoon and evening across central and northeastern NL in association with a weak short wave ahead of that upper low over Labrador. Lastly a frontal trough south of NS will continue to give scattered thunderstorms to the southern Maritimes marine district today.
On Friday there will be the risk of a thunderstorm in most of Labrador once again in the vicinity of an upper trough moving through the region.
Thunderstorm Outlook for Today
Thunderstorm Outlook for Tonight
Thunderstorm Outlook for Tomorrow
Jeremy
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