Thunderstorm Outlook for Today
Regional Impacts
Isolated thunderstorms over western Labrador this afternoon and into the evening. the main threat will be brief heavy downpours and high wind gusts.
Convective Discussion
A weak surface cold front extending through northern Quebec will advance towards Labrador this afternoon. Colder air aloft will destabilize the airmass between Shefferville and Wabush, and then around Churchill Falls late in the day. The La Grande sounding was modified with a Ts,Td combination of 23,14 which was enough to generate CAPE values of 250+ J/kg and Lifted index of -1. The hodograph is showing unidirectional winds through the unstable column and a westerly shear / Jet of 50kt - which would be enough to sustain these isolated pulse thunderstorms a little longer, which could in turn could produce surface gusts of 35kt or more.
Thunderstorm Outlook for Sunday
