Potent shortwave trough and associated cold front will impact the
eastern Great Lakes Tuesday into Wednesday. Showers and
thunderstorms will be possible with the incoming trough and
especially with the cold front late Tuesday afternoon and evening.
With PW values in the range of 1.5 to 1.7 inches some storms could
produce tropical downpours with localized flooding becoming a
concern considering antecedent conditions. With that said, guidance
suggest that there will be some limited instability of +500 J/kg to
work with and then 20/30 knots of 0-6km shear. So there could be an
isolated severe storm or two, but the arrival time of the trough
isn`t that favorable and sneaks in after peak heating.
Tuesday night, chances for showers and storms linger as the front
slowly drags itself across the Lower Lakes as we head into
Wednesday. Cooler Wednesday behind the front, still could be some
showers in the morning but progressively drier from west to east.
H850T fall to +9/+11 over the course of the day which will support
highs in the low to mid 70s.
Wednesday night, sfc high pressure settles in over the region
providing a cool and dry night. Good night to open the windows, lows
anticipated in the 50s to low 60s with low humidity levels.