Wyoming, 1999

Flash Flood in Wyoming, August 28, 1999

August 28, 1999 · NWS RIW · 1 event in 1 county or zone

Evidence of flash flooding of washes that feed into Buffalo Creek and in Buffalo Creek proper. Much debris and mud on road in area about 100 yards wide.

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.

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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.

Evidence of flash flooding of washes that feed into Buffalo Creek and in Buffalo Creek proper. Much debris and mud on road in area about 100 yards wide. Estimates of up to 1.5 inches of rain in less than 30 minutes in the area.

The radar

The Riverton/Lander radar (KRIW), 73 km away, was scanning. The volume nearest the first event began at 21:29 UTC.

Open the radar archive at this moment

Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Hot Springs

When
August 28, 2:30 PM MST to 2:45 PM MST
Where
Hot Springs County, 7 mi SE of Thermopolis
Reported by
NWS STORM SURVEY
Coordinates
43.719, -108.442 (the zone’s center; the record gives no point)

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

More

Every storm in Wyoming in 1999Every state in 1999This day in weather historyWarnings in Wyoming, August 1999

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: 5710250.