Thunderstorm Outlook for Day 1
Regional Impacts
Brief showers with risk of a thundershower for Terra Nova, Clarenville and Bonavista Peninsula.
Convective Discussion
Surface High pressure system continues to build over the Maritimes. High cloudiness ahead of a warm front extending ahead of extratropical cyclone Cristobal will continue to push eastward during the next day reaching Maine by Thursday. A 50kt southwesterly low-level jet will advect some low cloud and moisture, and forecast guidance is suggesting some elevated CAPE and a slight risk of thundershower early Thursday morning.
Over Newfoundland today, the air mass is fairly unstable but lacking moisture and diurnal heating. Towering-cumulus giving brief showers are in store for the afternoon, however with the help of a convergence line over east-central portions of the island, one or two of these TCU’s could build high enough to have glaciated tops. A slight risk of a thundershower is indicated on the western edge of a deck of strato-cumulus covering southeastern regions of the Island
Thunderstorm Outlook for Day 2
