Heavy Snow, Jackson Valley / Sc Teton
- When
- February 20, 4:00 AM MST to 2:00 PM MST
- Where
- Jackson Valley / Sc Teton forecast zone
- Reported by
- TRAINED SPOTTER
- Coordinates
- 43.241, -107.957 (the zone’s center; the record gives no point)
Heavy Snow in Wyoming, February 20, 2001
Locally heavy snow with up to 6 inches in the Jackson Hole area.
Where it happened
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.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 1
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.
What happened
The episode as NWS RIW wrote it up.
Locally heavy snow with up to 6 inches in the Jackson Hole area.
What forecasters said that day
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 20, 2:46 AM MST, 1 hour 14 minutes earlier.
Area forecast discussion, Feb 20, 2:46 AM MST, 1 hour 14 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 246 AM MST TUE FEB 20 2001 THE PATTERN REMAINS MUCH THE SAME AS THE LAST FEW DAYS WITH A LONGWAVE TROUGH OVER WEST COAST SPITTING OUT PIECES OF ENERGY FROM TIME TO TIME. THESE SHORTWAVES HAVE BEEN GETTING SHEARED APART AS THEY APPROACH THE COWBOY STATE RESULTING IN MAINLY JUST SOME CLOUDS EXCEPT FOR THE SOUTHWEST CWFA WHERE FLURRIES OR LIGHT SNOW SHOWERS HAVE BEEN COMMON. I DO NOT SEE MUCH OF A CHANGE FROM THIS SCENARIO TODAY EXCEPT FOR OUT WEST WHERE IR SATELLITE SHOWS A GROWING AREA OF COOLING CLOUD TOPS OVER NORTHEASTERN NEVADA. THE 06Z MESO ETA HAS THIS AREA MOVING ACROSS WEST CENTRAL AND NORTHWEST WYOMING TODAY SO I WILL GO WITH 2 TO 4 INCHES OF SNOW IN THE TETONS AND ACROSS YNK AND 1 TO 3 INCHES AROUND KJAC. MEANWHILE...ARCTIC AIR REMAINS WELL TO THE NORTHEAST ALTHOUGH A WEAK COLD FRONT HAS EKED SOUTHWARD INTO THE NORTHEAST WYOMING. A LOW CLOUD SHIELD HAS FORMED BEHIND THIS FRONT WHICH IS EXPECTED TO WASH OUT TODAY. AVN IS MUCH MORE BULLISH WITH MOISTURE ACROSS THE REGION THIS RUN WITH POPS SKY HIGH EAST OF THE DIVIDE. I WILL OPT FOR PERSISTENCE AND SIDE WITH THE MESO ETA AND KEEP MUCH OF THE AREA DRY TODAY EXCEPT FOR THE PREVIOUSLY MENTIONED SECTIONS OF THE WEST. SHORTWAVE RIDGE REBUILDS OVER THE STATE LATER TONIGHT INTO WEDNESDAY AND HOLDS INTO THURSDAY RESULTING IN DRY WEATHER EAST OF THE DIVIDE. CONTINUED WEAK UPSLOPE FLOW AT 500MB AND A LIMITED AMOUNT OF MOISTURE WILL CONTINUE THE CHANCE FOR SNOW SHOWERS OR FLURRIES OUT WEST. 700MB TEMPS DO NOT CHANGE MUCH OVER THE NEXT FEW DAYS SO I WILL STICK CLOSE TO SIMILAR GUIDANCE NUMBERS TODAY INTO WEDNESDAY. IN THE EXTENDED...A STRONGER WAVE MOVES IN OFF THE PACIFIC BRINGING MUCH OF WYOMING A CHANCE FOR LIGHT SNOW FRIDAY INTO EARLY SATURDAY. ALTHOUGH IT APPEARS THE BRUNT OF THE ENERGY WILL SKIRT SOUTH OF THE STATE...THE LARGER MAGNITUDE OF THIS WAVE AND A DECENT SURFACE REFLECTION DEFINITELY BRINGS A BETTER CHANCE FOR PRECIP...WHICH THE CURRENT EXTENDED HANDLES WELL. ANOTHER RIDGE IS SHOWN TO FOLLOW SUNDAY FOR MORE DRY WEATHER THEN MORE WEAK UPSLOPE FLOW MONDAY MAY RESULT IN SNOW SHOWERS IN THE WEST MONDAY. .RIW...NONE SULLIVAN
The radar
The national radar mosaic for the moment the first event began.
Event by event
1 heavy snow. Local standard time, as filed.
What these are
- Heavy Snow
- Snowfall reaching the local warning threshold without the other hazards of a winter storm.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
More
Every storm in Wyoming in 2001Every state in 2001This day in weather historyWarnings in Wyoming, February 2001
Sources
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: 5232427.