WASHINGTON, DISTRICT OF COLUMBIA — A powerful cold front that brought tornadoes and melon-sized hail in Illinois is now racing across the Mid-Atlantic, setting up a rare and dramatic weather reversal from near 80-degree warmth to heavy, wet snow — possibly with thunder and lightning — within 24 hours. Forecast guidance for Thursday, March 12, 2026, shows rapidly falling temperatures behind the front, with conditions supportive of thundersnow between 2 p.m. and 8 p.m. across parts of Washington DC, Maryland, Virginia, and Pennsylvania.
Meteorological models indicate the same dynamic system responsible for severe weather in the Midwest is now scouring out warm air along the East Coast, creating a volatile atmospheric setup not commonly seen this late in the season.
From Severe Midwest Storms to Mid-Atlantic Snow
The advancing cold front previously unleashed tornadoes and large hail in Illinois, demonstrating the strength of the parent storm system. As it moves eastward, it is colliding with warm, unstable air that surged northward earlier in the week.
In Washington DC, temperatures climbed close to 80 degrees, contributing to spring-like conditions before the frontal passage. However, model projections show temperatures plunging rapidly once the cold air undercuts the region. This rapid cooling creates a narrow but intense transition zone where rain can quickly flip to heavy, wet snow…