Alert archive / Nebraska / Flash Flood Warnings in 2026

Flash Flood Warning 12, NWS Cheyenne, WY

July 9, 2026Box Butte County, Dawes County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Jul 9, 2026, 4:31 PM MDT for Box Butte County, Dawes County, Nebraska. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 9, 2026, 4:31 PM MDT (22:31 UTC)
Expired: Jul 9, 2026, 7:30 PM MDT
In force: 3 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

Counties Box Butte County, NE, Dawes County, NE

The radar

The Rapid City radar (KUDX), 184 km from the middle of the area, began a volume at 22:34 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The text

As transmitted.

139 
WGUS55 KCYS 092231
FFWCYS
NEC013-045-100130-
/O.NEW.KCYS.FF.W.0012.260709T2231Z-260710T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cheyenne WY
431 PM MDT Thu Jul 9 2026

The National Weather Service in Cheyenne has issued a

* Flash Flood Warning for...
  North Central Box Butte County in the panhandle of Nebraska...
  South Central Dawes County in the panhandle of Nebraska...

* Until 730 PM MDT.

* At 431 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 1.5 inches of 
  rain have fallen. Additional rainfall amounts up to 1 inch are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  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...
  Box Butte Reservoir, Box Butte Campground and Box Butte Dam.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4258 10318 4247 10290 4235 10300 4240 10318
      4251 10328

FLASH FLOOD...RADAR INDICATED

$$

Fuller

1 follow-up statement

329 
WGUS75 KCYS 100124
FFSCYS

Flash Flood Statement
National Weather Service Cheyenne WY
724 PM MDT Thu Jul 9 2026

NEC013-045-100134-
/O.EXP.KCYS.FF.W.0012.000000T0000Z-260710T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Box Butte NE-Dawes NE-
724 PM MDT Thu Jul 9 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 730 PM MDT THIS EVENING FOR 
NORTH CENTRAL BOX BUTTE AND SOUTH CENTRAL DAWES COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

&&

LAT...LON 4258 10318 4247 10290 4235 10300 4240 10318
      4251 10328

$$

Fuller

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Cheyenne, WY wrote its last area forecast discussion before this flash flood warning went out at Jul 9, 12:37 PM MDT, 3 hours 54 minutes earlier. Its key messages:

Slight Risk of severe thunderstorms this afternoon with heavy rainfall, hail, and strong gusty winds possible.
Strong ridging aloft will produce a dry and hot period for Saturday through Thursday, with the primary challenges being the above normal heat and fire weather conditions.

Area forecast discussion, Jul 9, 12:37 PM MDT, 3 hours 54 minutes before

Area Forecast Discussion
National Weather Service Cheyenne WY
1237 PM MDT Thu Jul 9 2026

.KEY MESSAGES...

- Slight Risk of severe thunderstorms this afternoon with heavy
  rainfall, hail, and strong gusty winds possible.

- Strong ridging aloft will produce a dry and hot period for
  Saturday through Thursday, with the primary challenges being
  the above normal heat and fire weather conditions.

&&

.SHORT TERM /THROUGH FRIDAY NIGHT/...
Issued at 1230 PM MDT Thu Jul 9 2026

Scattered rainfall and some thunderstorms are beginning to form
across the region this afternoon. Similar to yesterday,
expecting storms to continue forming across the high terrain and
move eastwards through the afternoon and early evening into a
more favorable environment for stronger activity. Profiles look
similar to yesterday as well, with high based storms from
inverted V soundings promoting strong winds and accumulating
small hail to some smaller severe hail sizes possible.
Meanwhile we'll see another risk of flooding today as PWAT
values continue to sit in the 0.9-1.25 inch range, generally
around 100-130% of average. With storms expected to train across
the I-80 corridor, look for the highest risk of flooding from
Cheyenne eastwards through Sidney. High resolution guidance
consolidates this activity into clustered to linear activity as
it moves eastwards into the Nebraska Panhandle, keeping high
winds the primary threat into the late afternoon, with storms
beginning to exit our portion of Nebraska during the beginning
of the evening hours. Our severe threat should then diminish by
the time the sun sets, though some lingering showers or storms
may be possible through around midnight.

Into Friday, our focus begins to shift towards heat as ridging
starts building over the region. While the warmth won't begin to
scorch us quite yet, high temperatures should rise around 1-5
degrees with highs in the 80's to 90's for the day. Some
lingering moisture will keep our PWAT values around normal, and
a weak trough and upslope flow may be able to take advantage of
what's left of the moisture to produce an isolated shower or
storm across the southern Laramie Range and along the border
into Colorado, but activity should be weak and sporadic at best.
By the evening, anything that is able to form will dissipate,
the last grasp of notable moisture potential as heat and fire
weather become the focal point into the long term.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
Issued at 1230 PM MDT Thu Jul 9 2026

Saturday through Thursday...Primary challenges will be the heat and
fire weather conditions. Ridging aloft dominates our region, with
quite dry air at low and mid levels, accompanied by warm 700 mb
temperatures, thus chances for late day showers and thunderstorms
will be nearly nil and non existent, and dry weather will prevail.
The 700 mb temperatures will yield maximum temperatures in the 90 to
105 degree range. A weak perturbation and a slight increase in mid
level moisture may spark isolated thunderstorms on Wednesday, and
moreso on Thursday, although the ridging aloft will likely keep it
dry for the entire period.

&&

.AVIATION /18Z TAFS THROUGH 18Z FRIDAY/...
Issued at 1118 AM MDT Thu Jul 9 2026

Storm activity will begin increasing across the region over the
next couple of hours. Any storms could produce MVFR or worse
conditions and gusty, variable winds, all sites except KRWL
where only weak activity is expected. Cloud banks this afternoon
will generally be around 10K feet at BKN, with lowered CIGs
under any storm activity. After storms move out later this
evening, expect CIGs to begin lifting and clearing, with clear
skies into tomorrow morning. Winds are messy thanks to shifting
boundaries across the region and the expected storm activity,
but look for prevailing winds to generally be around 10-20
knots, variable across our entire forecast area, becoming light
and variable overnight into tomorrow morning as strong pressure
gradients exit the region.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.

&&

SHORT TERM...CG
LONG TERM...RUBIN
AVIATION...CG

In the hours before

Special weather statement, Jul 9, 1:08 PM MDT, 3 hours 23 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
108 PM MDT Thu Jul 9 2026

WYZ117-118-091945-
Central Laramie County WY-South Laramie Range Foothills WY-
108 PM MDT Thu Jul 9 2026

...A STRONG THUNDERSTORM WILL IMPACT WEST CENTRAL LARAMIE COUNTY
THROUGH 145 PM MDT...

At 108 PM MDT, Doppler radar was tracking a strong thunderstorm near
Whitaker, or 20 miles northwest of Cheyenne, moving southeast at 20
mph.

HAZARD...Wind gusts up to 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Whitaker.

This includes Interstate 25 in Wyoming between mile markers 23 and
34.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4139 10502 4148 10497 4146 10473 4128 10479
TIME...MOT...LOC 1908Z 293DEG 16KT 4141 10495

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Goatley

Special weather statement, Jul 9, 1:36 PM MDT, 2 hours 55 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
136 PM MDT Thu Jul 9 2026

WYZ117-118-092000-
Central Laramie County WY-South Laramie Range Foothills WY-
136 PM MDT Thu Jul 9 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL LARAMIE COUNTY
THROUGH 200 PM MDT...

At 136 PM MDT, Doppler radar was tracking a strong thunderstorm near
Winchester Hills, or 9 miles south of Cheyenne, moving east at 20
mph.

HAZARD...Wind gusts up to 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Winchester Hills, Bison Crossing, South Greeley Highway, Fox
Farm-College, Cowboy Ranch South, and Grass Hills.

This includes Interstate 25 in Wyoming between mile markers 1 and 6.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4107 10492 4111 10462 4100 10462 4100 10494
TIME...MOT...LOC 1936Z 272DEG 16KT 4102 10486

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Goatley

Special weather statement, Jul 9, 1:44 PM MDT, 2 hours 47 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
144 PM MDT Thu Jul 9 2026

WYZ118-119-092015-
Central Laramie County WY-East Laramie County WY-
144 PM MDT Thu Jul 9 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN LARAMIE COUNTY
THROUGH 215 PM MDT...

At 143 PM MDT, Doppler radar was tracking a strong thunderstorm near
Hillsdale, or 14 miles east of Cheyenne, moving east at 20 mph.

HAZARD...Wind gusts up to 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Burns, Hillsdale, and Carpenter.

This includes Interstate 80 in Wyoming between mile markers 375 and
388.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4114 10459 4123 10455 4121 10429 4104 10434
TIME...MOT...LOC 1943Z 285DEG 15KT 4117 10452

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Goatley

Special weather statement, Jul 9, 2:14 PM MDT, 2 hours 17 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
214 PM MDT Thu Jul 9 2026

WYZ117-118-092100-
Central Laramie County WY-South Laramie Range Foothills WY-
214 PM MDT Thu Jul 9 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN LARAMIE COUNTY
THROUGH 300 PM MDT...

At 214 PM MDT, Doppler radar was tracking a strong thunderstorm near
Willadsen Estates, or 14 miles southwest of Cheyenne, moving east at
20 mph.

HAZARD...Wind gusts up to 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Cheyenne, Happy Valley, Fox Farm-College, Cheyenne Regional Airport,
Winchester Hills, South Greeley Highway, Warren AFB, Frontier Park,
South Cheyenne, Bison Crossing, Ranchettes, Grass Hills, and Cowboy
Ranch South.

This includes the following highways...
 Interstate 25 in Wyoming between mile markers 1 and 13.
 Interstate 80 in Wyoming between mile markers 346 and 366.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4114 10513 4120 10472 4100 10473 4100 10509
TIME...MOT...LOC 2014Z 270DEG 16KT 4105 10504

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Goatley

Special weather statement, Jul 9, 2:23 PM MDT, 2 hours 8 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
223 PM MDT Thu Jul 9 2026

WYZ117>119-092100-
Central Laramie County WY-South Laramie Range Foothills WY-
East Laramie County WY-
223 PM MDT Thu Jul 9 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN LARAMIE COUNTY
THROUGH 300 PM MDT...

At 223 PM MDT, Doppler radar was tracking a strong thunderstorm near
Laramie County Fairgrounds at Archer, or 11 miles southeast of
Cheyenne, moving east at 20 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Cheyenne, Egbert, Laramie County Fairgrounds at Archer, and
Carpenter.

This includes Interstate 80 in Wyoming between mile markers 368 and
369, and between mile markers 374 and 392.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4101 10470 4115 10470 4119 10423 4100 10424
      4100 10468
TIME...MOT...LOC 2023Z 270DEG 16KT 4106 10460

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

Goatley

Local storm report, Jul 9, 4:17 PM MDT, 14 minutes before

Preliminary Local Storm Report
National Weather Service Cheyenne WY
417 PM MDT Thu Jul 9 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0414 PM     Hail             4 WNW Box Butte Dam     42.47N 103.15W
07/09/2026  M1.50 Inch       Dawes              NE   Storm Chaser

&&

RV

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 8, 7:44 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Scotts Bluff	31 min
Jul 8, 8:12 PM MDT	Special Weather Statement	CYS	Banner, Cheyenne, Scotts Bluff	33 min
Jul 8, 8:46 PM MDT	Special Weather Statement	CYS	Cheyenne, Morrill	44 min
Jul 8, 8:54 PM MDT	Special Weather Statement	CYS	Cheyenne	36 min
Jul 9, 2:20 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	40 min
Jul 9, 2:57 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	63 min
Jul 9, 3:16 PM MDT	Flash Flood Warning	CYS	Dawes, Sioux	3 hr
Jul 9, 3:40 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	50 min
Jul 9, 4:21 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	39 min
Jul 9, 4:54 PM MDT	Special Weather Statement	CYS	Cheyenne	36 min
Jul 9, 4:59 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	61 min
Jul 9, 5:27 PM MDT	Special Weather Statement	CYS	Box Butte	33 min
Jul 9, 5:34 PM MDT	Flash Flood Warning	CYS	Box Butte	3 hr
Jul 9, 5:56 PM MDT	Special Weather Statement	CYS	Cheyenne	34 min
Jul 9, 5:59 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	46 min

Nearby

Flash Flood Warnings in Nebraska, 2026 Every 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; radar from the NEXRAD Level II archive.