Regional Impacts
Today:
No thunderstorms forecast.
Tonight:
No thunderstorms forecast.
Tomorrow:
LAB: Risk of isolated thundershowers giving locally heavy downpours and strong wind gusts.
NB: Risk of isolated thunderstorms.
NS/PEI/NL: No thunderstorms forecast.
Convective Discussion
A ridge of high pressure continues to dominate Atlantic Canada today, supressing convective potential. Widespread smoke aloft from fires out west also will work to inhibit potential. A trough of low pressure over James Bay with a warm front that extends eastward across Ungava Bay and extreme northern Labrador may kick off some TCUs this afternoon but primarily north of Nain.
The ridge of high pressure will eventually sink southeastward into the southern Maritime waters tomorrow and the trough moves eastward into northern Quebec and across northern Labrador tomorrow. Ahead and along the trough, scattered showers and risk of thundershowers are expected, mainly across southern to central Labrador where CAPE values could exceed 500 J/kg. Westerly straight-line shear is weak to moderate, so expecting single to multicell potential with brief winds gusts and with precipitable water in of 35 mm, so locally heavy downpours are also possible. Weak troughing also reaches northwestern New Brunswick, where a slight risk of showers or thundershowers in the afternoon. Some residual smoke aloft will likely still be around which could cap convection.
Thunderstorm Outlook for Today
Thunderstorm Outlook for Tonight
Thunderstorm Outlook for Tomorrow
Roberta McArthur
