Alert archive / Wyoming / Flash Flood Warnings in 2026

Flash Flood Warning 10, NWS Cheyenne, WY

July 8, 2026Laramie County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jul 8, 2026, 6:10 PM MDT for Laramie County, Wyoming. It was in force for 3 hr. 7 reports 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: Jul 8, 2026, 6:10 PM MDT (00:10 UTC)
Expired: Jul 8, 2026, 9:15 PM MDT
In force: 3 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 24 km from the middle of the area, began a volume at 00:13 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
Jul 8, 6:18 PM MDT	FLASH FLOOD	2 Ene Cheyenne, WY	Public reported to dispatch of hazardous road conditions due to flooding and a few cars stranded.
Jul 8, 6:20 PM MDT	FLASH FLOOD	1 Nne Cheyenne, WY	There was flooding on Sheridan St and Mountain Rd. Quite a bit of mud and dirt was over the road, and I was in that area earlier yesterday (before storms), which did not have that. I do want to note this is a flash flood/flood prone area.
Jul 8, 6:22 PM MDT	FLASH FLOOD	1 Ese Cheyenne, WY	Media report of flooded roadway in Slack Channel at Henderson and Forest in Cheyenne. Video shows flooded water with some motion. Water a quarter way up car tires.
Jul 8, 6:30 PM MDT	FLASH FLOOD	Cheyenne, WY	NWS Employee reported standing water, more than usual with rain, with large drainage ditches and catch basins being completely full.
Jul 8, 6:30 PM MDT	RAIN 1.63	2 E Cheyenne, WY	NWS Employee reports 1.63 inches of rain in about 1 hour east of Cheyenne.
Jul 8, 6:30 PM MDT	RAIN 1.9	4 Ene Cheyenne, WY	Public report of 1.9 inches of rain at Dell Range and Highway 30 east of Cheyenne.
Jul 8, 6:36 PM MDT	FLASH FLOOD	4 Ene Cheyenne, WY	Public reported to dispatch of road flooding blocking traffic on Whiteney Road.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 5 storm reports to this flash flood warning; the first came 8 minutes after it went out.

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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.2 hours before the alert went out and 332 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1735 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1985 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.1

Open this sounding in Storm Lab

The text

As transmitted.

099 
WGUS55 KCYS 090010
FFWCYS
WYC021-090315-
/O.NEW.KCYS.FF.W.0010.260709T0010Z-260709T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cheyenne WY
610 PM MDT Wed Jul 8 2026

The National Weather Service in Cheyenne has issued a

* Flash Flood Warning for...
  South Central Laramie County in southeastern Wyoming...

* Until 915 PM MDT.

* At 610 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.5 and 1.5 inches of 
  rain have fallen with more storms on the way. 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...
  Cheyenne, Laramie County Fairgrounds at Archer, Fox Farm-College, 
  South Cheyenne, South Greeley Highway, Ranchettes, Cheyenne 
  Regional Airport, Bison Crossing, Winchester Hills, North 
  Cheyenne, Frontier Park, Carpenter, Warren AFB, Grass Hills and 
  Cowboy Ranch South.

This includes the following highways...
	Interstate 25 in Wyoming between mile markers 7 and 16.
	Interstate 80 in Wyoming between mile markers 360 and 381.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4100 10421 4100 10434 4100 10442 4100 10447
      4100 10450 4100 10454 4100 10460 4100 10466
      4100 10468 4100 10470 4100 10473 4106 10486
      4122 10486 4126 10475 4118 10447

FLASH FLOOD...RADAR INDICATED

$$

Mose

2 follow-up statements

757 
WGUS75 KCYS 090043
FFSCYS

Flash Flood Statement
National Weather Service Cheyenne WY
643 PM MDT Wed Jul 8 2026

WYC021-090315-
/O.CON.KCYS.FF.W.0010.000000T0000Z-260709T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Laramie WY-
643 PM MDT Wed Jul 8 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MDT THIS 
EVENING FOR SOUTH CENTRAL LARAMIE COUNTY...

At 643 PM MDT, The public reported thunderstorms producing heavy 
rain in east Cheyenne. Between 0.5 and 1.5 inches of rain have 
fallen. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public reported.

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...
  Cheyenne, Laramie County Fairgrounds at Archer, Fox Farm-College, 
  South Cheyenne, South Greeley Highway, Ranchettes, Cheyenne 
  Regional Airport, Bison Crossing, Winchester Hills, North 
  Cheyenne, Frontier Park, Carpenter, Warren AFB, Grass Hills and 
  Cowboy Ranch South.

This includes the following highways...
	Interstate 25 in Wyoming between mile markers 6 and 16.
	Interstate 80 in Wyoming between mile markers 360 and 381.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4100 10421 4100 10434 4100 10442 4100 10447
      4100 10450 4100 10454 4100 10460 4100 10466
      4100 10468 4100 10470 4100 10473 4106 10486
      4122 10486 4126 10475 4118 10447

FLASH FLOOD...OBSERVED

$$

Mose

424 
WGUS75 KCYS 090308
FFSCYS

Flash Flood Statement
National Weather Service Cheyenne WY
908 PM MDT Wed Jul 8 2026

WYC021-090318-
/O.EXP.KCYS.FF.W.0010.000000T0000Z-260709T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Laramie WY-
908 PM MDT Wed Jul 8 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MDT THIS EVENING FOR 
SOUTH CENTRAL LARAMIE COUNTY...

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

&&

LAT...LON 4100 10421 4100 10434 4100 10442 4100 10447
      4100 10450 4100 10454 4100 10460 4100 10466
      4100 10468 4100 10470 4100 10473 4106 10486
      4122 10486 4126 10475 4118 10447

$$

Mose

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 8, 5:52 PM MDT, 18 minutes earlier. Its key messages:

Slight Risk of severe thunderstorms this afternoon and Thursday with heavy rainfall, hail, and strong gusty winds possible.
A ridge builds into the long term, drying the area out and developing Red Flag and potential heat advisory conditions through next week.

Area forecast discussion, Jul 8, 5:52 PM MDT, 18 minutes before

Area Forecast Discussion
National Weather Service Cheyenne WY
552 PM MDT Wed Jul 8 2026

.KEY MESSAGES...

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

- A ridge builds into the long term, drying the area out and
  developing Red Flag and potential heat advisory conditions
  through next week.

&&

.SHORT TERM /THROUGH THURSDAY NIGHT/...
Issued at 125 PM MDT Wed Jul 8 2026

As of this afternoon the dryline is noted on radar right around
the I-25 corridor and retreating westwards into Cheyenne proper.
Development has begun along this boundary with a few storms
noted, but nothing strong currently. Forecast sounding profiles
across the region note inverted V's, which combined with DCAPE
values into the 1000-1500 J/kg range would be indicative of
high based storms with strong wind gusts the primary hazards.
That being said, there is a little bit of instability across the
region, and some meager support for updrafts, so we can't rule
out a storm or two to have at least some hail, whether it be
severe in size or small accumulating hail. Finally, moisture is
actually notably plentiful east of I-25 despite the dry surface,
with PWAT values into the 1-1.5" range. With the scattered
nature of storm development, if any we get multiple stronger
storms training over the same location, a marginal risk of
excessive rainfall will be possible. Storms will continue into
the early evening, but by around 8-9 PM storms should be on the
decline as support wanes.

Moving into Thursday, our severe risk continues once again along
and east of the I-25 corridor, but this time profiles will
support a bit more organization to storm development. Initial
storms should go up during the early afternoon with steep mid-
level lapse rates and modest instability around 1000-2000 J/kg,
which would support isolated storms capable of both large hail
and damaging winds. This batch of activity though will likely
grow upscale into a more linear feature, which will shift the
primary hazard into mostly strong winds as storms evolve into
western Nebraska. And like today, PWAT values into the 1-1.5"
range should fuel at least a meager risk of localized flooding.
Once again as the sun goes down we'll see storm activity wane
and/or move out of our area.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
Issued at 125 PM MDT Wed Jul 8 2026

Friday...The atmosphere dries out somewhat compared to today and
Thursday, with shortwave ridging aloft bulging over eastern Wyoming.
The 12Z GFS indicates decent low and mid level moisture for far
southeast Wyoming and the Nebraska Panhandle, and diurnal heating
and low level mechanical lift, along with a passing perturbation,
will likely produce isolated late day showers and thunderstorms from
I-25 eastward, and we may see our POPS and thunderstorm coverage
increase somewhat in the next few model runs and days.

Saturday through Wednesday...Ridging aloft dominates our region,
with quite dry air at low and mid levels, accompanied by 700 mb
temperatures from 14 to 21 Celsius, 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 Tuesday, and moreso on Wednesday, along the
convective inhibition aloft gradient along the I-25 corridor and
further to the west.

&&

.AVIATION /00Z TAFS THROUGH 00Z FRIDAY/...
Issued at 547 PM MDT Wed Jul 8 2026

A relatively active evening for thunderstorm development is expected
today, as the Storm Prediction Center in Norman, Oklahoma has a
slight risk for severe thunderstorms through this evening, to the
east of a Casper to Cheyenne line, including far southeast Wyoming
and the Nebraska Panhandle. A marginal risk of severe thunderstorms
for this evening exists elsewhere to the west of the aforementioned
Casper to Cheyenne line.

Synoptically, a negatively tilted shortwave trough aloft will move
into western Nebraska this evening, while a low level convergence
axis develops along the Interstate 25 corridor, then storms will
develop and strengthen as they develop and propagate across far
southeast Wyoming, and especially the Nebraska Panhandle this
evening, where scattered thunderstorms will likely conglomerate and
develop into a Mesoscale Convective Complex, or MCC, somewhere over
the Nebraska Panhandle this evening, thunderstorms will likely end
across the Nebraska Panhandle in the 03Z to 05Z timeframe.

Wyoming TAFS...Using the 21Z HRRR, which has consistently been
fairly accurate with respect to timing, high confidence, and expect
thunderstorms to continue until around 02Z.

Expect TEMPO for thunderstorms at Rawlins, Laramie and Cheyenne for
much of the early evening hours, and some storms will produce low
level turbulence, strong downdrafts, as well as gusty and erratic
winds up to 45 knots, along with brief MVFR visibility restrictions.
VFR prevails however, with clouds clearing out late this evening and
overnight. As is typical, expect gusty gradient and mix down winds
until sunset.

At Cheyenne, best chance for thunderstorms, and high confidence,
according to the likely accurate 21Z run of the HRRR, will be until
02Z, and storms increasing in coverage and intensity through early
evening. Some storms will produce low level turbulence, strong
downdrafts, as well as gusty and erratic winds up near 50 knots,
along with brief MVFR visibility restrictions. VFR prevails however,
with clouds clearing out late this evening and overnight. As is
typical, expect gusty gradient and mix down winds until sunset.

Nebraska TAFS...High confidence in the 21Z HRRR run, which has
consistently shown thunderstorms developing and/or propagating along
the Wyoming and Nebraska state line around 23Z, and crossing the
Panhandle during the 00Z to 04Z time frame, with clusters of
thunderstorms and a possible MCC, Mesoscale Convective Complex,
forming this evening, somewhere over the northern or central
Nebraska Panhandle and propagating southeastward. The strongest
storms will be capable of producing one inch diameter hail or
larger, wind gusts in excess of 60 mph and locally heavy rainfall,
along with low level turbulence, and strong downdrafts. Brief MVFR
will be likely during the thunderstorms this evening, with skies
clearing out late this evening and late tonight. As is typical,
expect gusty gradient winds and mix down winds until sunset.

&&

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

&&

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

In the hours before

Local storm report, Jul 8, 4:20 PM MDT, 1 hour 50 minutes before

Preliminary Local Storm Report
National Weather Service Cheyenne WY
420 PM MDT Wed Jul 8 2026

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

0350 PM     Hail             12 E Chugwater          41.76N 104.59W
07/08/2026  M1.25 Inch       Goshen             WY   Trained Spotter

&&

Special weather statement, Jul 8, 4:33 PM MDT, 1 hour 37 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
433 PM MDT Wed Jul 8 2026

WYZ110-090145-
North Snowy Range Foothills-
Including the cities of Arlington and Elk Mountain
433 PM MDT Wed Jul 8 2026

Gusty showers are moving east near Arlington and along I-80. These
showers will be capable of producing wind gusts in excess of 50 to
55 mph.

These showers are expected to continue for the next two to three
hours.

Local storm report, Jul 8, 5:25 PM MDT, 45 minutes before

Preliminary Local Storm Report
National Weather Service Cheyenne WY
525 PM MDT Wed Jul 8 2026

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

0425 PM     Hail             9.5 NW Hawk Springs     41.89N 104.40W
07/08/2026  M1.00 Inch       Goshen             WY   Public

            Delayed, public report of quarter-sized hail
            9 miles west and 3 miles north of Hawk
            Springs.

&&

Special weather statement, Jul 8, 5:41 PM MDT, 29 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
541 PM MDT Wed Jul 8 2026

WYZ117>119-090015-
Central Laramie County WY-South Laramie Range Foothills WY-
East Laramie County WY-
541 PM MDT Wed Jul 8 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN LARAMIE COUNTY
THROUGH 615 PM MDT...

At 541 PM MDT, trained weather spotters reported a strong
thunderstorm near Cheyenne, moving north at 10 mph.

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

SOURCE...Trained weather spotters.

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

Locations impacted include...
Cheyenne, Laramie County Fairgrounds at Archer, Fox Farm-College,
Cheyenne Regional Airport, Winchester Hills, South Greeley Highway,
Ranchettes, Warren AFB, Frontier Park, North Cheyenne, South
Cheyenne, Carpenter, Bison Crossing, Grass Hills, and Cowboy Ranch
South.

This includes the following highways...
 Interstate 25 in Wyoming between mile markers 6 and 15.
 Interstate 80 in Wyoming between mile markers 358 and 385.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
southeastern Wyoming.

&&

LAT...LON 4109 10491 4126 10480 4112 10421 4100 10417
      4100 10467
TIME...MOT...LOC 2341Z 177DEG 11KT 4115 10473

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

Vasquez

Special weather statement, Jul 8, 5:44 PM MDT, 26 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
544 PM MDT Wed Jul 8 2026

WYZ102-090015-
Niobrara County WY-
544 PM MDT Wed Jul 8 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN NIOBRARA COUNTY
THROUGH 615 PM MDT...

At 544 PM MDT, Doppler radar was tracking a strong thunderstorm near
Keeline, or 15 miles west of Lusk, moving east at 15 mph.

HAZARD...Wind gusts up to 40 mph and nickel 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...
Manville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
east central Wyoming.

&&

LAT...LON 4282 10483 4291 10479 4289 10451 4273 10462
TIME...MOT...LOC 2344Z 291DEG 13KT 4284 10473

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

Vasquez

Special weather statement, Jul 8, 6:09 PM MDT, 1 minute before

Special Weather Statement
National Weather Service Cheyenne WY
609 PM MDT Wed Jul 8 2026

WYZ103-105-106-115>117-090045-
Shirley Basin WY-South Laramie Range WY-
Central Laramie Range and Southwest Platte County WY-
North Laramie Range WY-South Laramie Range Foothills WY-
Laramie Valley WY-
609 PM MDT Wed Jul 8 2026

...STRONG THUNDERSTORMS WILL IMPACT NORTHEASTERN ALBANY...
NORTHWESTERN LARAMIE...SOUTHWESTERN PLATTE AND SOUTHERN CONVERSE
COUNTIES THROUGH 645 PM MDT...

At 608 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles west of Garrett to 8 miles northwest of
Flying X Ranch to near Baldy Peak. Movement was northeast at 20 mph.

HAZARD...Wind gusts of 50 to 55 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...
Friend Park Campground, Baldy Peak, Sybille Canyon, Flying X Ranch,
Garrett, and Wheatland Reservoir Number 3.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
southeastern and east central Wyoming.

&&

LAT...LON 4229 10552 4204 10524 4149 10513 4143 10553
      4216 10581
TIME...MOT...LOC 0008Z 244DEG 19KT 4214 10573 4193 10550 4155 10545

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

Vasquez

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 6:09 PM MDT	Special Weather Statement	CYS	Albany	36 min
Jul 8, 6:57 PM MDT	Special Weather Statement	CYS	Laramie	33 min
Jul 8, 7:03 PM MDT	Special Weather Statement	CYS	Laramie	27 min
Jul 8, 7:20 PM MDT	Special Weather Statement	CYS	Laramie	25 min
Jul 8, 7:29 PM MDT	Special Weather Statement	CYS	Laramie	16 min
Jul 8, 7:44 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	31 min
Jul 8, 7:48 PM MDT	Special Weather Statement	CYS	Goshen	27 min
Jul 8, 7:58 PM MDT	Special Weather Statement	CYS	Platte	32 min
Jul 8, 8:25 PM MDT	Special Weather Statement	CYS	Niobrara	35 min
Jul 9, 1:08 PM MDT	Special Weather Statement	CYS	Laramie	37 min
Jul 9, 1:36 PM MDT	Special Weather Statement	CYS	Laramie	24 min
Jul 9, 1:44 PM MDT	Special Weather Statement	CYS	Laramie	31 min
Jul 9, 2:14 PM MDT	Special Weather Statement	CYS	Laramie	46 min
Jul 9, 2:23 PM MDT	Special Weather Statement	CYS	Laramie	37 min
Jul 9, 4:59 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	46 min

Nearby

Flash Flood Warnings in Wyoming, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.