Regional Impacts
Today:
NS/NB/PEI/NL: None.
Tomorrow:
NS: Embedded thunderstorms on Friday in western NS, locally heavy downpours of 30-60 mm.
NB: Scattered thunderstorms on Friday along the Fundy coast on Friday, locally heavy downpours of 30-60 mm.
PEI: Isolated thundershowers possible on Friday, locally heavy downpours of 10-20 mm.
NL: None.
Convective Discussion…
Not much going on today in terms of convective weather, although a few lightning strikes are possible over the Atlantic ocean, south of Sable Island.
The main story will be with an incoming stream of tropical moisture tomorrow. Rain and some isolated thunderstorms are forecast to move into the Maritimes by tomorrow morning along a warm front, before more organized convective activity along the cold front will move through Nova Scotia and southern New Brunswick on Friday evening into Saturday night. PWAT values will build to near 60 mm by Friday afternoon for Nova Scotia and southern New Brunswick, with ample mid-level instability upwards of 500-750 J/kg allowing for some organized convection along the cold front by Friday evening. Storms are expected to be more isolated Friday morning and afternoon, before becoming more organized on Friday evening and overnight into Saturday as the 250 and 500 mb jets approach the Maritimes. The main threat with these storms will be locally heavy downpours of 30-60 mm. Rainfall rates in excess of 25 mm/h are possible.
Thunderstorm Outlook for Today
Thunderstorm Outlook for Tonight
Thunderstorm Outlook for Tomorrow
Copp