Hazardous thunderstorms are possible on Wednesday for portions of the Gulf Coast, Midwest, and Tennessee Valley. Moderate to heavy snow is expected across the Pacific Northwest.
A shortwave trough embedded in the main flow across a large part of the country will push northeastward from the Southern Plains towards the upper part of the Great Lakes region. A surface low is expected to accompany this shortwave from the Mid Missouri Valley to the Ohio Valley. These features, along with moisture pushing northward from the Gulf, are expected to allow severe thunderstorms, particularly supercells, to develop in the region. The main threats associated with developed convection will be hail, damaging winds, and some significant tornadoes. Excessive rainfall will also be possible with totals over 2.5 inches possible in some areas.
Snowfall is anticipated to continue into Wednesday across the Pacific Northwest with accumulations of 6 to 10 inches possible in some areas.