1 avalanche, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Riverton, WY wrote its last area forecast discussion before the first event at Feb 23, 1:48 PM MST, 4 hours 42 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 148 PM MST FRI FEB 23 2001 WATER VAPOR LOOP SHOWS MAIN UPPER LOW DIGGING ALONG SOUTH CA COAST WITH 130 KNOT JET ON BACK SIDE. FIRST SHORTWAVE IN SW DIFLUENT FLOW OVER NE WY. CHANNELED VORTICITY WORKING NWD THRU EASTERN UTAH ASSOCIATED WITH LIGHT TO MODERATE SNOWFALL WITH TS UNDER AREA OF BEST UPPER DIVERGENCE OVER SOUTH UTAH. THIS PRECIPITATION WEAKENING QUICKLY AS IT REACHES DEFORMATION AXIS ACROSS IDAHO/SW MONTANA. 19Z SURFACE MAP SHOWS LOW DEEPENING OVER SE COLORADO. ETA HAS BEEN VERIFYING BEST SO FAR WITH SHORTWAVES AHEAD OF MAIN LOW AND ASSOCIATED AREAS OF LIFT/INSTABILITY. AVN FURTHER SOUTH WITH TRACK OF UPPER LOW...BUT FURTHER NORTH WITH SURFACE LOW DEVELOPMENT IN EAST COLORADO TONIGHT. WITH TROUGH TAKING ON A NEGATIVE TILT...MAIN AREA OF UPPER DIVERGENCE AND NEG DIV-Q SHIFTS TO NE COLORADO INTO WEST NEBRASKA TONIGHT WITH CPR ON THE NW FRINGE. REST OF CWFA IS UNDER STRONG H3 CONVERGENCE WITH ONLY WEAK UVV IN THE LOWER LEVELS. SNOWFALL OVER CPR AREA WILL BE ENHANCED BY A NORTH UPSLOPE FLOW AS LOW DEEPENS OVER EASTERN COLORADO. REMAINING SNOWFALL IN WEST WILL TAPER OFF THIS EVENING. NORTH AND WEST CENTRAL ZONES SHOULD SEE AREAS OF LIGHT SNOW MAINLY IN OROGRAPHICALLY FAVORED AREAS THRU SATURDAY MORNING WITH NORTH/ NORTHEAST UPSLOPE FLOW...WILL GENERALLY GO WITH 1 TO 2 INCH ACCUMULATIONS. LOW MOVES AWAY ACROSS KS SATURDAY WITH SNOW ENDING CENTRAL BY 18Z WITH LINGERING -SN IN CPR INTO THE AFTERNOON. WEST WINDS TO INCREASE ACROSS SW ZONES SATURDAY WITH BLOWING/DRIFTING SNOW IN AREAS THAT RECEIVED 2 TO 4 INCHES TODAY. SATURDAY NIGHT AND SUNDAY...120 KNOT JET DIGS TROUGH ACROSS WESTERN CANADA WITH SHORTWAVE MOVING ACROSS NORTH MONTANA. THERMAL PACKING REMAINS NORTH OF WY BORDER. INCREASING WESTERLY FLOW WITH WARM AIR ADVECTION AND WEAK PVA WILL RESULT IN SCT POPS NW MOUNTAINS. IN EXTENDED...MRF/AVNX CONTINUE TO BACK OFF ON ARCTIC SURGE INTO AREA EARLY NEXT WEEK. ECMWF MOST CONSISTENT OVER LAST COUPLE OF RUNS. WILL MENTION SLIGHT CHANCE OF -SN EAST OF DIVIDE MONDAY WITH POSSIBLE FRONTAL PASSAGE...AND DRY/SEASONABLE AFTERWARDS. CHANCE OF SNOW INCREASES ACROSS WEST THURSDAY AS FLOW BECOMES MORE PROGRESSIVE WITH SEVERAL SHORTWAVES IN FLOW. .RIW...SNOW ADVISORY TONIGHT THROUGH SATURDAY MORNING..ZONE 15 AEM
The national radar mosaic for the moment the first event began.
1 avalanche. Local standard time, as filed.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Avalanche, Teton/Moutains / Teton Except N and Sc | 2001-02-23 | 24 | Male | Outside/Open Areas | Direct |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2001Every state in 2001This day in weather historyWarnings in Wyoming, February 2001
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5232428.