Erie, Pennsylvania – Colder air funneling south from the Upper Midwest ahead of St. Patrick’s Day could turn part of northwestern Pennsylvania’s active weather pattern into accumulating snow between March 11 and March 17.
According to the National Weather Service Climate Prediction Center, Pennsylvania falls within a 40-50% probability zone for above-normal precipitation during the 8-14 day period. At the same time, temperatures across the Great Lakes and into northwestern Pennsylvania trend near to below normal. That overlap increases the likelihood that stronger systems tracking through the Ohio Valley bring wet snow to areas near Lake Erie.
In Erie and Crawford counties, overnight lows dipping into the upper 20s and lower 30s could allow slushy accumulation on grassy surfaces and untreated roads if moderate precipitation develops. Along Interstate 90 and I-79, bursts of heavier precipitation during pre-dawn hours may briefly reduce visibility and create slick stretches, especially on bridges and overpasses. Farther south toward Pittsburgh, rain is more likely, but brief mix-ins cannot be ruled out if colder air deepens at night.
The broader eastern United States is favored to see wetter-than-normal conditions, while California and much of the Southwest trend drier, sharpening the national contrast.
Drivers across northwestern Pennsylvania should monitor early morning travel conditions closely. Even minor late-season snowfall can create slippery roadways. Additional updates are expected as the March 11-17 window approaches and storm timing becomes clearer.
