Alert archive / Nebraska / Flash Flood Warnings in 2026
Flash Flood Warning 21, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Aug 15, 2026, 2:47 PM MDT for Dawes County, Sioux County, Nebraska. It was in force for 58 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 15, 2026, 2:47 PM MDT (20:47 UTC)
- Expired
- Aug 15, 2026, 3:45 PM MDT
- In force
- 58 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Dawes County, NE, Sioux County, NE
The radar
The Rapid City radar (KUDX), 166 km from the middle of the area, began a volume at 20:47 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 15, 3:15 PM MDT | FLASH FLOOD | 1 Ene Fort Robinson, NE | Delayed report. Fort Robinson State Park employee estimated a 6 to 10 ft rise in the White River outside of the in about 30 minutes, with water running over a few bridges. Exact time of flooding was estimated. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The text
As transmitted.
567
WGUS55 KCYS 152047
FFWCYS
NEC045-165-152145-
/O.NEW.KCYS.FF.W.0021.260815T2047Z-260815T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cheyenne WY
247 PM MDT Sat Aug 15 2026
The National Weather Service in Cheyenne has issued a
* Flash Flood Warning for...
West Central Dawes County in the panhandle of Nebraska...
Northeastern Sioux County in the panhandle of Nebraska...
* Until 345 PM MDT.
* At 247 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1.25 inches of
rain have fallen. The expected rainfall rate is 1.5 to 3 inches in
1 hour. Flash flooding is ongoing or expected to begin shortly.
Excessive rainfall over the burn scar may result in debris flow
moving through the South Fork and Soldier Creek area. The debris
flow can consist of rock, mud, vegetation and other loose materials.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Crawford, Fort Robinson State Park and Soldier Creek Campground.
This includes the following streams and drainages...
Tucker Creek, White River, Middle Fork Soldier Creek, Sand Creek,
Boggy Creek, Cherry Creek, Bozle Creek, North Fork Soldier Creek,
Soldier Creek, Smiley Canyon Creek, Little Cottonwood Creek and
Spring Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall will cause
extensive and severe flash flooding of creeks...streams...and
ditches in the Burn Scar. Severe debris flows can also be
anticipated across roads. Roads and driveways may be washed away in
places. If you encounter flood waters...climb to safety.
Move to higher ground now. Act quickly to protect your life.
Be aware of your surroundings and do not drive on flooded roads.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 4278 10366 4276 10338 4265 10342 4266 10369
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-3 INCHES IN 1 HOUR
$$
MM1 follow-up statement
898 WGUS75 KCYS 152147 FFSCYS Flash Flood Statement National Weather Service Cheyenne WY 347 PM MDT Sat Aug 15 2026 NEC045-165-152157- /O.EXP.KCYS.FF.W.0021.000000T0000Z-260815T2145Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dawes NE-Sioux NE- 347 PM MDT Sat Aug 15 2026 ...FLASH FLOOD WARNING HAS EXPIRED FOR WEST CENTRAL DAWES AND NORTHEASTERN SIOUX COUNTIES... Flood waters have receded. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. A Flood Watch remains in effect until 1000 PM MDT Saturday for portions of panhandle Nebraska and Wyoming. && LAT...LON 4278 10366 4276 10338 4265 10342 4266 10369 $$ Trudel
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 6:27 PM MDT | Areal Flood Advisory | CYS | Cheyenne, Morrill | 2 hr |
| Aug 14, 7:47 PM MDT | Areal Flood Advisory | CYS | Banner, Kimball | 101 min |
| Aug 15, 1:12 AM MDT | Flood Watch | CYS | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 21 hr |
| Aug 15, 2:22 PM MDT | Areal Flood Advisory | CYS | Sioux | 113 min |
| Aug 15, 2:42 PM MDT | Special Weather Statement | CYS | Dawes | 33 min |
| Aug 15, 3:16 PM MDT | Special Weather Statement | CYS | Dawes | 29 min |
| Aug 15, 3:37 PM MDT | Special Weather Statement | CYS | Dawes | 38 min |
| Aug 15, 3:55 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Kimball | 50 min |
| Aug 15, 4:05 PM MDT | Flash Flood Warning | CYS | Kimball | 3 hr |
| Aug 15, 4:07 PM MDT | Special Weather Statement | CYS | Box Butte | 23 min |
| Aug 15, 4:18 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte | 42 min |
| Aug 15, 4:55 PM MDT | Special Weather Statement | CYS | Box Butte | 35 min |
| Aug 15, 5:08 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte | 36 min |
Nearby
Flash Flood Warnings in Nebraska, 2026Every flash flood warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; radar from the NEXRAD Level II archive.