Thunderstorm Outlook for Today, June 20th.
Regional Impacts
Isolated non-severe thundershowers are possible over the Gulf waters as well as offshore over Laurentian fan. These cells are expected to be embedded in showers being driven by the upper trof. Only a few lightning strikes are forecast in the risk areas.
Convective Discussion
The upper low is still the dominant weather forcing for today. Not much has changed since yesterday, other than sfc temperatures cooling further in NB. As a result, the atmosphere although saturated/moisture rich in the low levels is fairly stable. Shearwater this AM is moist yet stable up to 9,000ft. Much more of a springtime fog/drizzle airmass regime than a summer severe weather day. East of CYQY, there is even thermal ridging above 700 to prevent anything further. And, back to the west, the airmass is far too dry (across Maine).
Thunderstorm Outlook for Tomorrow, June 21st.
Regional Impacts
No thunderstorms expected at this time.
Convective Discussion
Atmosphere continues to stabilize further as upper low fills. Forecast highs quite cool across Atlantic Canada for first day of summer.
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