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Overview

One of the most significant outbreaks of severe weather to impact southeast Wyoming and the western Nebraska Panhandle in the past 30 years occurred on the afternoon and evening of Monday 12 June 2017.  A strong low pressure system moving across the northern Rockies on Monday triggered widespread severe thunderstorms across the area. The Storm Prediction Center (SPC) issued a moderate risk forecast for Monday. The Storm Prediction Center issued a particularly dangerous situation (PDS) tornado watch around 1:00 pm.  This is the first ever PDS tornado watch issued for Wyoming.

Throughout the afternoon several tornadoes touched down initially near Fort Laramie, WY and lifted northeast through north central Goshen County, and crossed the state line into Sioux County. Several homesteads were damaged with 2 minor injuries in this area. Another tornado touched down roughly 11 miles northeast of Cheyenne and produced only minor damage. Additional tornadoes formed across the extreme southeast corner of Wyoming and lifted northeast contributing to damage in northwest Kimball County and into Morrill and Box Butte Counties. Numerous homes were damaged with this tornado. The town of Bayard was an area hit the hardest with several homes near complete losses. These storms continued to move northeast until finally weakening later that night.

In total 40 warnings were issued throughout the course of the day. 23 were tornado warnings, and 15 were severe thunderstorm warnings. 22 reports of tornado sightings were reported during the afternoon and evening. 

Radar GIF

Radar reflectivity of the storms that developed during the afternoon and early evening.

Supercells near Bushnell tornado north Cheyenne Kimball ne

Several Supercells near Bushnell, NE

Credit: Jacob Deflitch

Tornado that formed north of Cheyenne

Credit: Chuck Patient

Supercell near Kimball, NE

Credit: Tyler Sanders

 

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