370
NWUS55 KRIW 221753
LSRRIW
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1153 AM MDT TUE SEP 22 2026
.TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON
.DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.
..REMARKS..
0430 PM TORNADO 15 SE SAINT STEPHENS 42.82N 108.21W
09/19/2026 FREMONT WY STORM CHASER
DELAYED REPORT: ON SATURDAY AFTERNOON SEP
19, A NON-MESOCYCLONE TORNADO (OFTEN
REFERRED TO AS A "LANDSPOUT TORNADO")
TOUCHED DOWN NEAR THE INTERSECTION OF SAND
DRAW RD (WY HWY 135) AND OIL SPRINGS RD. A
103 MPH WIND GUST WAS MEASURED BY A
VEHICLE-MOUNTED WIND SENSOR, MAKING THIS AN
EF1 RATED TORNADO. NO OTHER REPORTS OF
DAMAGE WERE RECEIVED, AS THE TORNADO
IMPACTED A RURAL AREA WITH PRIMARILY SANDY
SOILS AND SAGEBRUSH. A VIDEO OF THE TORNADO
SHOWS A BROAD SURFACE CIRCULATION BLOWING
DUST INTO MULTIPLE PEOPLE, THEN THE
CIRCULATION TIGHTENED AND STRENGTHENED,
IMPACTING A VEHICLE, WERE THE WIND GUST WAS
MEASURED. MULTIPLE THUNDERSTORMS WERE
NEARBY, WITH ASSOCIATED STORM OUTFLOWS &
GUST FRONTS INTERACTING, LIKELY CONTRIBUTING
TO BRIEF SURFACE-BASED CIRCULATIONS IN THIS
AREA. A MESOCYCLONE WAS NOT EVIDENT IN THE
NEAREST STORM ON RADAR.
RIW
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