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Asperitas clouds sighted in western Pennsylvania

By Jesse Ferrell, AccuWeather meteorologist and senior weather editor

Published Apr 23, 2019 7:48 PM EDT | Updated Apr 23, 2019 8:05 PM EDT

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There was a flurry of photos of Asperitas clouds today on the Pennsylvania Weather Watchers group on Facebook. Asperitas clouds are new, at least as far as their official recognition, which I talk about in this AccuWeather story.

PA Asperitas 4/23 #1

Asperitus clouds in Mercer County, PA 4/23

Facebook/Donald Martin

The clouds in some cases were accompanied by virga (precipitation which is falling but not reaching the ground) which is not a surprise, since they essentially represent the edge of the precipitation.

PA Asperitas 4/23 #4
Donald Martin

The photos above were taken in Mercer County by Donald Martin; below by Laura Kosht at Moraine State Park, PA, and below that, New Castle, PA by Renee Krasinski.

PA Asperitas 4/23 #2
PA Asperitus 4/23 #3
Renee Krasinski

They occurred, as they often do, on the edge of a group of storms where dry air meets moist air, and they were sighted in and around Mercer County, north of Pittsburgh (encircled on the radar/satellite map below).

PA Asperitas Map 4/23

These shots were taken from the WeatherSTEM cameras in Pittsburgh:

PA Asperitas 4/23 Webcams

The animation below shows a time-lapse of the Asperitas clouds on the Pittsburgh camera:

By the time the clouds reached State College this afternoon, they weren't nearly as impressive, but still fun to watch as these WeatherSTEM camera timelapses show:

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Jesse Ferrell
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