National Weather Service United States Department of Commerce

Winter Returns Across the Northern Tier; Record Warmth for the Southwest

A large high pressure system will usher in cold air for this first day of March across the northern Plains, Great Lakes, Northeast and mid-Atlantic. Some wintry precipitation may evolve across the mid-Mississippi Valley, Ohio Valley and mid-Atlantic through Monday. Meanwhile, record warmth will spread across the Southwest, southern Plains through early this week. Read More >

Overview

June 22nd was a highly unstable day, and became the busiest and most widespread severe weather day of the year so far. A thunderstorm wind gust/squall estimated at 60 mph occurred at the NWS Office in State College. This squall lasted almost 2 minutes, and was accompanied by pea size hail at the office. Numerous large hail reports also came in from many locations in and around the rest of State College. Many trees were downed, as the storms were mainly bow echoes, with occasional rotation present. Numerous reports of large hail also came in from across Central PA.

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Balloon Sounding from KLWX (Washington DC). See the Positive Area (a.k.a. "B+" or "CAPE") is almost 2800 J/kg! That is Highly Unstable.
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