Take a look at a viral, time-lapse video of a supercell spotted in northeast Wyoming near Clareton Sunday by Basehunters Chasers:
“These low precipitation supercells are usually found in the Plains or northern Rockies as they form along a boundary dividing dry air to the west and more moist air to the east,” AccuWeather.com Meteorolgist Brian Edwards said. “They generally do not occur east of the Mississippi River.”
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Source: Accuweather