434
NWUS55 KCYS 200217
LSRCYS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
817 PM MDT TUE MAY 19 2026
.TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON
.DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.
..REMARKS..
0832 PM WILDFIRE 11 W AGATE 42.38N 103.98W
05/13/2026 SIOUX NE EMERGENCY MNGR
THUNDERSTORMS LIKELY SPARKED THIS GRASS FIRE
IN RURAL WESTERN SIOUX COUNTY. START TIME
ESTIMATED FROM LIGHTNING DETECTION NETWORKS
WITH A STRIKE COLLOCATED WITH THE STARTING
LOCATION OF THIS FIRE. CONDITIONS AT NEARBY
WEATHER STATIONS WERE BREEZY WITH SOUTHEAST
WINDS GUSTING 25-30 MPH AND RELATIVE
HUMIDITY VALUES BETWEEN 18-22%. THE FIRE
BEGAN TO SPREAD NORTHWEST UNDER THESE
CONDITIONS OVERNIGHT. AN ESTIMATED 380-425
ACRES OF MOSTLY GRASSLANDS WERE BURNED.
TOTAL FIRE CONTAINMENT WAS CONFIRMED ON MAY
19.
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