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Showers and Thunderstorms from the Great Lakes into the Southern Plains

Frontal boundary and wave of low pressure will keep an active weather pattern from the Great Lakes region through the southern Plains the next couple of days. Isolated instances of severe thunderstorms and flash flooding are possible. Meanwhile, as summer comes to a close, above normal temperatures continue for central and eastern U.S. - especially for most of Puerto Rico with excessive heat. 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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