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Western PA Battered by Rare Thundersnow Event
12 Dec, 2025
Summary
- Thundersnow occurred in western Pennsylvania, captured on video.
- Thundersnow is a rare phenomenon caused by lightning during snowstorms.
- Heavy snow is predicted for the weekend, with varying accumulations.
Overnight, western Pennsylvania experienced the rare phenomenon of thundersnow, an event where lightning occurs during a snowstorm. Video footage from Mt. Pleasant in Westmoreland County captured the dramatic occurrence, showing snow, lightning, thunder, and rumbling. Meteorologists confirmed multiple reports of this unusual weather.
According to NOAA, thundersnow requires significant atmospheric instability and moisture, often above a warm front, making it less common in winter. The National Weather Service notes that thundersnow typically brings high snowfall rates, which can contribute to hazardous road conditions due to blowing, drifting, or compacted snow.
The region is preparing for another significant snow event this upcoming weekend. Forecasts suggest accumulating snow from Saturday night into Sunday, with northern counties like Beaver and Butler expecting 1 to 2 inches, while southern areas such as Allegheny and Washington anticipate 2 to 4 inches. Ridges are projected to receive the most, with over 6 inches of snow.
