Flash Flood Warning 8, NWS Cheyenne, WY

624 
WGUS55 KCYS 270129
FFWCYS
NEC157-270330-
/O.EXT.KCYS.FF.W.0008.000000T0000Z-260627T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cheyenne WY
729 PM MDT Fri Jun 26 2026

The National Weather Service in Cheyenne has extended the

* Flash Flood Warning for...
  Central Scotts Bluff County in the panhandle of Nebraska...

* Until 930 PM MDT.

* At 729 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain in Scottsbluff, Gering. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 0.5 to 1 inch are 
  possible in the warned area. Flash flooding is already occurring.

  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...
  Scottsbluff, Gering, Terrytown, Scotts Bluff National Monument and 
  Scottsbluff Airport.

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 4177 10367 4179 10372 4186 10373 4193 10363
      4185 10357

FLASH FLOOD...RADAR INDICATED

$$

Vasquez

Area Forecast Discussion
National Weather Service Cheyenne WY
525 PM MDT Fri Jun 26 2026

.KEY MESSAGES...

- There is a Slight Risk (2 of 5) of strong to severe
  thunderstorms Friday afternoon. Isolated large hail and strong
  gusty winds are possible east of Interstate 25.

- Warming temperatures, falling humidity, and increasing winds
  will increase fire weather concerns this weekend into early
  next week.

&&

.SHORT TERM /THROUGH SUNDAY NIGHT/...
Issued at 121 PM MDT Fri Jun 26 2026

Development is beginning this afternoon generally along the
front range and just east where a stationary boundary is
located. We should see instability rise once again through the
afternoon hours, with some light shear currently present but
should be strengthening into the evening hours with bulk shear
around 30-50 knots. With this environment, it appears that
widely scattered thunderstorms will be possible in the next
couple of hours and continue into the evening, with large hail
and strong wind gusts the primary hazards.

Into Saturday we'll see the dryline move eastwards and bring a
much drier environment across the CWA. The one exception to
this could be our far eastern Nebraska Panhandle counties, which
could see some development during the later afternoon and
evening hours, but with how dry low levels will be expectation
is that this activity should either be ramping up in this area
and will be strongest just east of these counties, or may even
be dry in nature as better moisture remains just east. In either
case, we should be seeing a break from the stronger storm
activity, with daytime relative humidity values back down into
the teens and breezy winds accompanying. This should bring an
elevated fire weather threat to the area, with the strongest
risk for our zones west of the Laramie Range as strong wind
gusts are expected with the 700mb jet strengthening to around
45-50 knots. Currently we do not anticipate a Red Flag Warning
as last reported fuels remain green, however with how strong
these winds may be combined with the dry conditions we are still
considering breaking the glass for a warning across this area.
Will consult with the evening and nighttime shifts, but a
decision may not be made until tomorrow morning.

Sunday we'll see a shortwave rounding the base of the larger
western US trough moving across the area with the bulk of the
best moisture and storm parameters to the north. This will bring
a sliver of a marginal risk for stronger storms across our
northern zones, but for the most part we'll only have a slight
risk of some showers or possible storms in a mostly mediocre
environment. Breezy winds expected again from the low-level jet
kicking in, but RH values should slightly increase and limit
critical fire weather conditions, with an elevated environment
expected. Otherwise expect a meager cold front pass across the
region through the day, with highs west of the Laramie Range
just under or around 80 degrees, with further east highs sit in
the 80's to low 90's, but descending as we move into the long
term period.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
Issued at 121 PM MDT Fri Jun 26 2026

The persistent troughing that has been glued to the northwest the
better part of the weekend will still be with us to start off the
long-term. A strong shortwave on the southern end of this trough
will swing by Sunday night into Monday morning with a cold front. We
will start off Monday on the backside of the front with winds
shifting from the northwest and drier continental air advecting in.
High temperatures will be slightly cooler than Sunday's, reaching
the upper 70s west and 80s east. Skies should stay mostly clear and
winds breezy up to 45-50 mph in some portions of the area. Some high
wind conditions may show up along the Laramie Range near the
Wheatland area. Most will see gust up to 30 mph. Despite the
rainfall we have received the last few days, fuels remain dry in the
Nebraska and most eastern Wyoming firezones. The anticipated
conditions do incite some concerns in elevated wildland fire
possibilities that basically stick around the rest of the long-term
period.

Tuesday sees much the same as Monday. Winds relax slightly as the
shortwave moves off to the northeast and a ridge axis noses in. This
will also mark the start of a warming trend through at least Friday,
if not longer. Another shortwave associated with the larger
troughing will swing by Tuesday. At the surface enough return flow
out of the southeast may allow a few storms to develop as the
shortwave moves overhead, primarily for the eastern areas. Past
Tuesday temperatures continue to increase each day with a slight
chance of afternoon thunderstorms. Bulk windshear stays elevated
through this period, so I wouldn't discount some risk of severe
thunderstorms. Unfortunately after Friday global ensemble models are
hinting at a large upper level high pressure system developing and
persisting. If this is indeed the reality of the very long term, we
could be in for a long period of hot and dry weather.

&&

.AVIATION /00Z TAFS THROUGH 00Z SATURDAY/...
Issued at 525 PM MDT Fri Jun 26 2026

Thunderstorms are beginning to take shape across the CWA this
afternoon, with a complex heading towards KBFF. Elsewhere, isolated
thunderstorms are moving across the region and may impact KCYS,
KCDR, KSNY and KAIA in the next hour or so. Therefore, PROB30 groups
are in the aforementioned TAFs through about 04Z this evening. Expect
gusty and erratic winds in any storm that goes over a terminal or
comes in the VC of one. TS activity should begin to wind down after
04Z this evening, but expect winds to remain gusty in the 25 to 35
knot range. Outside of TS activity, VFR conditions will prevail
otherwise.

&&

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

&&

SHORT TERM...CG
LONG TERM...RV
AVIATION...RZ

Preliminary Local Storm Report
National Weather Service Cheyenne WY
524 PM MDT Fri Jun 26 2026

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

0405 PM     Wildfire         8 W Fort Robinson       42.67N 103.64W
06/09/2026                   Sioux              NE   Emergency Mngr

            *** 1 INJ ***
            Lightning strike from a nearby thunderstorm
            stuck a T-post 12 feet into the Nebraska
            National Forest igniting the South Fork
            Wildland fire. Under favorable conditions
            and numerous wind shifts the fire quickly
            spread to the east and south overnight of
            June 9. Highway 20 and Fort Robinson State
            Park were closed June 10. The Fort Robinson
            State Park Museum evacuated with artifacts
            safely transferred. During June 11 the
            northern parts of Crawford were under an
            evacuation as the fire encroached the area.
            Southwesterly winds on June 13 increased
            fire activity on the northern edge of the
            fire creating noticeable smoke plumes. A
            multitude of agencies and resources were
            used to combat this fire with total
            personnel reaching above 500. On June 24th,
            a little over two weeks since the fire
            started, the fire was declared 100 percent
            contained. A total of 39,696 acres of
            wildland and timber was burned. A
            firefighter did sustain an injury while
            working the fire.

&&

RV

Special Weather Statement
National Weather Service Cheyenne WY
526 PM MDT Fri Jun 26 2026

NEZ003-019>021-096-270000-
Scotts Bluff NE-Box Butte NE-Morrill NE-South Sioux NE-Banner NE-
526 PM MDT Fri Jun 26 2026

...STRONG THUNDERSTORMS WILL IMPACT SOUTHWESTERN BOX BUTTE...EASTERN
SCOTTS BLUFF...NORTHWESTERN MORRILL...NORTHEASTERN BANNER AND
SOUTHEASTERN SIOUX COUNTIES THROUGH 600 PM MDT...

At 526 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from Lake Alice to near Harrisburg. Movement was
east at 20 mph.

HAZARD...Wind gusts up to 50 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...
Scottsbluff, Gering, Bayard, Terrytown, Minatare, Melbeta, McGrew,
Wildcat Hills State Recreation Area, Lake Minatare State Recreation
Area, Lake Alice Number 2, Scotts Bluff National Monument, Chimney
Rock National Historic Site, Harrisburg, Scottsbluff Airport, Lake
Alice, Wrights Gap, Moomaw Corner, and South Bayard Junction.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
the Panhandle of Nebraska.

&&

LAT...LON 4205 10317 4147 10339 4149 10388 4204 10367
TIME...MOT...LOC 2326Z 266DEG 18KT 4198 10360 4153 10378

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

Goatley

Special Weather Statement
National Weather Service Cheyenne WY
529 PM MDT Fri Jun 26 2026

WYZ101-102-270000-
Converse County Lower Elevations WY-Niobrara County WY-
529 PM MDT Fri Jun 26 2026

...STRONG THUNDERSTORMS WILL IMPACT CENTRAL NIOBRARA AND EAST CENTRAL
CONVERSE COUNTIES THROUGH 600 PM MDT...

At 528 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 11 miles southwest of Manning Ranch to 10 miles
northeast of Lusk. Movement was northeast at 15 mph.

HAZARD...Wind gusts up to 50 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...
Lance Creek and Manning Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
east central Wyoming.

&&

LAT...LON 4307 10405 4306 10405 4282 10428 4279 10517
      4309 10495
TIME...MOT...LOC 2328Z 227DEG 14KT 4285 10501 4286 10432

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

Goatley

Special Weather Statement
National Weather Service Cheyenne WY
531 PM MDT Fri Jun 26 2026

WYZ106>108-116>118-270000-
East Platte County WY-South Laramie Range WY-
Central Laramie Range and Southwest Platte County WY-
Goshen County WY-Central Laramie County WY-
South Laramie Range Foothills WY-
531 PM MDT Fri Jun 26 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN ALBANY...
SOUTHWESTERN GOSHEN...NORTHWESTERN LARAMIE AND SOUTHWESTERN PLATTE
COUNTIES THROUGH 600 PM MDT...

At 531 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles north of Whitaker, or 30 miles north of Cheyenne, moving east
at 25 mph.

HAZARD...Wind gusts up to 40 mph and pea 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...
Chugwater, Whitaker, and Horse Creek.

This includes Interstate 25 in Wyoming between mile markers 28 and
60.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
southeastern Wyoming.

&&

LAT...LON 4127 10527 4164 10535 4182 10480 4146 10456
TIME...MOT...LOC 2331Z 247DEG 22KT 4158 10494

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Vasquez

Special Weather Statement
National Weather Service Cheyenne WY
534 PM MDT Fri Jun 26 2026

NEZ055-270000-
Cheyenne NE-
534 PM MDT Fri Jun 26 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN CHEYENNE COUNTY
THROUGH 600 PM MDT...

At 534 PM MDT, Doppler radar was tracking a strong thunderstorm over
Lorenzo, or 8 miles south of Sidney, moving northeast at 20 mph.

HAZARD...Wind gusts up to 50 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...
Sidney, Colton, Sidney Municipal Airport, Lorenzo, and Cheyenne
County Fairgrounds.

This includes Interstate 80 in Nebraska between mile markers 53 and
66.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
the Panhandle of Nebraska.

&&

LAT...LON 4128 10307 4118 10275 4100 10293 4100 10310
TIME...MOT...LOC 2334Z 206DEG 17KT 4102 10303

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

Goatley

Preliminary Local Storm Report
National Weather Service Cheyenne WY
539 PM MDT Fri Jun 26 2026

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

0534 PM     Hail             8 S Gering              41.71N 103.68W
06/26/2026  M0.75 Inch       Scotts Bluff       NE   Storm Chaser

            Penny sized hail reported on Hwy71.

&&

RV