Winter Storm in Wyoming, September 21 to 23, 2000

Name: Winter Storm in Wyoming, September 21 to 23, 2000
Start: 2000-09-21T18:00
End: 2000-09-23T18:00
Location: Wyoming

September 21 to 23, 2000 · NWS RIW · 15 events in 15 counties and zones

and up to a foot of snow to the Casper area and to parts of Sweetwater County.

Where it happened

Every event with a place to put it; 15 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

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 15

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.

Early Fall storm brought up to 2 feet of snow to the Big Horn Mtns...12 to 18 inches to the Absarokas and Wind River Mtns...and up to a foot of snow to the Casper area and to parts of Sweetwater County.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

15 winter storm. Local standard time, as filed.

Winter Storm, East Johnson

When: September 21, 6:00 PM MST to September 22, 3:00 PM MST
Where: East Johnson forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 41.660, -108.879 (the zone’s center; the record gives no point)

Winter Storm, Flaming Gorge / Sc Sweetwater

When: September 21, 6:00 PM MST to September 23, 6:00 PM MST
Where: Flaming Gorge / Sc Sweetwater forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 42.516, -110.286 (the zone’s center; the record gives no point)

Winter Storm, Green Mountains / S Fremont

When: September 21, 6:00 PM MST to September 23, 6:00 PM MST
Where: Green Mountains / S Fremont forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 42.904, -109.273 (the zone’s center; the record gives no point)

Winter Storm, Kemmerer / S Lincoln

When: September 21, 6:00 PM MST to September 23, 12:00 PM MST
Where: Kemmerer / S Lincoln forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 43.041, -108.630 (the zone’s center; the record gives no point)

Winter Storm, Lander Foothills / C Fremont

When: September 21, 6:00 PM MST
Where: Lander Foothills / C Fremont forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 43.002, -109.948 (the zone’s center; the record gives no point)

Winter Storm, Natrona / Natrona Except X Se

When: September 21, 6:00 PM MST to September 23, 6:00 PM MST
Where: Natrona / Natrona Except X Se forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 42.904, -109.273 (the zone’s center; the record gives no point)

Winter Storm, North Absarokas / C Park

When: September 21, 6:00 PM MST
Where: North Absarokas / C Park forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 43.760, -108.887 (the zone’s center; the record gives no point)

Winter Storm, Owl Creek Mountains / S Hot Springs

When: September 21, 6:00 PM MST to September 22, 6:00 PM MST
Where: Owl Creek Mountains / S Hot Springs forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 43.695, -107.538 (the zone’s center; the record gives no point)

Winter Storm, Red Desert / Ne Sweetwater

When: September 21, 6:00 PM MST to September 23, 6:00 PM MST
Where: Red Desert / Ne Sweetwater forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 42.264, -110.656 (the zone’s center; the record gives no point)

Winter Storm, Rock Springs/Green River / Sw Sweetwater

When: September 21, 6:00 PM MST to September 23, 6:00 PM MST
Where: Rock Springs/Green River / Sw Sweetwater forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 42.962, -106.798 (the zone’s center; the record gives no point)

Winter Storm, Southeast Big Horn Mountains / W Johnson

When: September 21, 6:00 PM MST to September 22, 3:00 PM MST
Where: Southeast Big Horn Mountains / W Johnson forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 42.264, -110.656 (the zone’s center; the record gives no point)

Winter Storm, Southeast Sweetwater

When: September 21, 6:00 PM MST to September 23, 6:00 PM MST
Where: Southeast Sweetwater forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 42.767, -109.915 (the zone’s center; the record gives no point)

Winter Storm, Western Big Horn Mountains / E Big Horn / E Washakie

When: September 21, 6:00 PM MST
Where: Western Big Horn Mountains / E Big Horn / E Washakie forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 42.433, -109.520 (the zone’s center; the record gives no point)

Winter Storm, Wind River Mtns East / Wc Fremont

When: September 21, 6:00 PM MST to September 23, 12:00 PM MST
Where: Wind River Mtns East / Wc Fremont forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 44.039, -106.585 (the zone’s center; the record gives no point)

Winter Storm, Yellowstone National Park Mt Id / W Park / N Teton

When: September 21, 6:00 PM MST
Where: Yellowstone National Park Mt Id / W Park / N Teton forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 44.228, -110.089 (the zone’s center; the record gives no point)

What these are

Winter Storm: A storm that brought snow, sleet or freezing rain at warning levels, usually over several hours or days.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Wyoming in 2000 Every state in 2000 This day in weather history Warnings in Wyoming, September 2000

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: 5157114, 5157115, 5157116, 5157117, 5157118, 5157119, 5157120, 5157121, 5157122, 5157123, 5157124, 5157125, 5157168, 5157169, 5157170.