Convective discussion:
There is the risk for non-severe thundershowers over southern Labrador, in the Annapolis valley area of Nova Scotia and over the southwestern marine waters this afternoon and evening.
Technical Discussion:
A warm front currently over southern Labrador is lying near quasi-stationary today. There is the slight risk of embedded thundershowers along and north of the front today and into the overnight hours where cloud top cooling may help to destabilize the air mass further. Precipitable water values are ranging between 40-50mm so locally heavy downpours are possible. The area from Goose Bay toward Cartwright is already under a rainfall warning.
There is a slight risk of a thundershower over Nova Scotia this afternoon, especially in the Annapolis Valley where clouds are expected to clear, allowing convective temperatures to be reached. There is no real trigger over the area other than ample moisture and moderate instability so anything that develops will not be long lived but given the high precipitable water levels, a locally heavy downpour is possible.
On the northwestern edge of the ridge, some thundershowers are occurring over West Scotian Slope and approaching Georges Bank and will likely continue to slowly push northward today.
Regional Impacts:
Nova Scotia: Slight chance of a thundershower.
Labrador: Chance of thundershowers with local downpours.
Southwestern marine waters: Thundershowers this afternoon.
New Brunswick, Prince Edward Island and Newfoundland: Nil
Roberta McArthur