Flash Flood, Sublette
- When
- August 9, 2:55 PM MST
- Where
- Sublette County, Big Piney
- Reported by
- GENERAL PUBLIC
- Coordinates
- 42.767, -109.915 (the zone’s center; the record gives no point)
Flash Flood in Wyoming, August 9, 2001
Flooding occurred across highway 189 just south of Big Piney.
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.
Flooding occurred across highway 189 just south of Big Piney.
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 Aug 9, 12:50 PM MST, 2 hours 5 minutes earlier.
Area forecast discussion, Aug 9, 12:50 PM MST, 2 hours 5 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 150 PM MDT THU AUG 9 2001 WV IMAGERY SHOWING STRONG SHORT WAVE OVER SOUTHERN ID AND NORTHEAST NV WITH GOOD DRYING BEHIND IT OVER MUCH OF NV. ALSO...SOME CLOUD TOP COOLING ON IR OVER SOUTHERN ID. BEST INSTABILITY ACROSS THE WESTERN CWFA WITH A FEW CG STRIKES OVER NORTHERN LINCOLN AND WESTERN SUBLETTE COS. MORE ORGANIZED CONVECTION OVER THE UINTAS AND WESTERN CO. THE ID/NV SHORT WAVE WILL BE THE SHORT TERM WEATHER PROBLEM ACROSS THE WEST CWFA THIS EVENING. STABLE AIRMASS IN PLACE EAST OF THE DIVIDE WITH SC SLOWLY BREAKING. UPPER LEVEL WEST-NORTHWEST FLOW OVER THE CWFA THROUGH 12/00Z WITH UPPER RIDGE OVER THE SOUTHWEST US. SHORT WAVE TO MOVE ACROSS THE CWFA TONIGHT WITH BEST 7-3H OMEGA ACROSS THE WEST BETWEEN 10/00Z AND 10/06Z AND THEN DYNAMICS THEN WEAKEN OVER THE EAST AFTER 10/06Z. WILL GO WITH SCT EVE POPS ACROSS THE WEST TONIGHT AND ISOLD OVER THE EAST. FOR FRI AND SAT WILL GO WITH ISOLD AFTN AND EVE POPS AS ONLY INSTABILITY WILL BE THE TRIGGER AND DYNAMICS WILL BE WEAK. WILL NOT MAKE ANY THE CHANGES TO THE EXTENDED AS UPPER RIDGE WILL EDGE TOWARD WY AND UPPER LEVEL WNW FLOW OVER THE CWFA. RIW...NONE MC
The radar
The national radar mosaic for the moment the first event began.
Event by event
1 flash flood. Local standard time, as filed.
What these are
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Hail and Damaging Winds in Illinois, August 9, 2001
- Heat in Missouri, August 9, 2001
- Heat in Texas, August 9, 2001
- Hail and Damaging Winds in New York, August 9, 2001
- Flood and Damaging Winds in Wisconsin, August 9, 2001
- Hail and Damaging Winds in Michigan, August 9, 2001
- Flash Flood and Hail in Ohio, August 9, 2001
- Lightning Strike in Michigan, August 9, 2001
- Lightning Strike in New York, August 9, 2001
- Damaging Wind in Texas, August 9, 2001
- Lightning Strike in North Dakota, August 9, 2001
- Damaging Winds in Vermont, August 9, 2001
More
Every storm in Wyoming in 2001Every state in 2001This day in weather historyWarnings in Wyoming, August 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: 5263396.