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Wednesday, July 4, 2018

Day 1 Convective Outlook for Atlantic Canada Valid for July 4, 2018

Convective discussion:

Some isolated thunderstorms expected today associated with a frontal trough south of Nova Scotia and southeast of Newfoundland.

Some isolated thunderstorms possible for New Brunswick, PEI, northern NS and Cape Breton later today and tonight as a weak warm front moves into the region.

Technical Discussion:
A weak trough south of the Maritimes and Newfoundland will continue to push off to the southeast today. Meanwhile a weak warm front will move into New Brunswick today then across northern Nova Scotia, PEI and Cape Breton tonight.

There have been some elevated thunderstorms this morning across southern marine waters south of NS and over the Grand Banks. This will continue today as the trough slides southeastward. Meanwhile a warm front now over southeastern QC will move into the Maritimes today. KCAR tephi shows about 40 knots of wind shear, but extremely dry in the low levels…same for WMW. Just a slight risk of a thunderstorm later today and tonight for some areas given the weak upper support. OTWZ nil sig weather expected.

Regional Impacts:

New Brunswick, northern Nova Scotia (including Cape Breton) and PEI: brief heavy downpours and gusty winds in isolated cells.

Newfoundland and Labrador: nil.

Jeremy