National Weather Service United States Department of Commerce

Areas of Heavy Rainfall and Critical Fire Weather on Wednesday

Heavy to excessive rainfall may bring flooding to parts of Arizona, New Mexico, Florida, North Carolina, and Virginia Wednesday. Recently burned areas will be particularly vulnerable to flash flooding. Gusty winds and low humidity will bring critical fire weather to parts of the Northwest U.S. and central Alaska on Wednesday where Red Flag Warnings are in effect. Read More >

Overview

An active weather system over the Great Basin brought conditions conducive for severe weather over northern and eastern portions of Wyoming on Monday, June 12th. Heat, moisture and wind shear was greatest in these areas. Storms initially formed near Casper, WY around 12:30pm, moving NNW into southern Johnson County. These storms gradually turned into supercells by 3:00 – 4:00pm, with other convection starting to form in the Big Horn Basin.  The first tornadic storm developed around 5:00pm over SW Johnson County, near Barnum. 1” to 1.75” hail was reported near Barnum by 5:15pm, increasing to 2.5” by 5:30pm 5 miles SW of Kaycee. This storm then proceeded to produce multiple vortices, as it neared Kaycee and Mayoworth. Reports of tornadoes came in between 5:35 and 5:50pm, as the storm slowly moved to the NNE.  

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