Petite surprise du SPC pour les secteurs de l'extrême sud du Québec aujourdhui.. Froid et humide en altitude donc possibilité de fortes pluies pouvant générer des micro-rafales et grêle dans les plus fortes cellules.
..New England and Upper Ohio Valley...
A mid-level trough will continue to shift eastward over Quebec
today, with the base of the trough and moderately strong cyclonic
flow aloft overspreading northern New York and northern New England.
Models indicate that scattered thunderstorm development is probable
during peak afternoon heating, in the presence of moderate CAPE
(1000-2000 J/kg) and shear enhanced at least somewhat by a belt of
20-30 kt westerly mid-level flow. Damaging winds and some hail will
be possible regionally, but in particular across northeast New York
and Vermont where a more favorable combination of instability/shear
should exist near a weak surface wave/warm front.