Special Weather Statement, NWS Cheyenne, WY

Area Forecast Discussion
National Weather Service Cheyenne WY
1108 AM MDT Mon Jun 22 2026

.KEY MESSAGES...

- Isolated to scattered afternoon and evening thunderstorms are
  expected today, mainly east of I-25, with some storms likely
  becoming strong to severe, with the main threats being large
  hail and strong winds.

- Widely scattered strong to severe thunderstorms are possible
  again on Tuesday, with large hail and strong winds as the
  primary hazards.

- Daily chances for showers and thunderstorms will continue
  through much of the week ahead with temperatures near average
  west of I-25 and cooler than average east of I-25.

&&

.UPDATE...
Issued at 729 AM MDT Mon Jun 22 2026

Some early morning isolated showers and thunderstorms are
ongoing across our northern counties, as evidenced by WSR-88D
radar reflectivity loop and visible satellite imagery along with
lightning indicators. Added some low POPS to cover isolated to
widely scattered thunderstorms through 10 AM for Converse and
Niobrara Counties of southeast Wyoming and for our northern
Nebraska Panhandle counties of Sioux, Dawes and Box Butte.

&&

.SHORT TERM /THROUGH TONIGHT/...
Issued at 202 AM MDT Mon Jun 22 2026

Another day and another shot of severe weather, more on that in a
bit. With an abundance of low-level moisture in place, low ceilings
and areas of fog are possible for many location east of the I-25
corridor through the early morning hours, with most of it eroding by
noon as model solutions depict. Then, attention shifts to the
possibility of severe weather once again for this afternoon
primarily east of the Laramie Range into the Nebraska Panhandle.
This is where storms will initiate and drift off to the east,
sometime between 1-3PM. The severity of the storms are always on our
minds and what are the possibilities of tornadoes. Well, there will
be ample instability in place along with enough shear, enough to
produce strong winds and large hail, at the start. As we progress
through the afternoon hours, the low-level jet should ramp up, this
will increase vertical shear and with ample instability in place,
this may supper the development of supercells. These supercells will
have the capability to produce very large hail and perhaps a tornado
or two into the evening hours. All this is shown with in-house hi-
res guidance, the development of discrete supercells developing
near the I-25 corridor and trekking east into the Nebraska Panhandle
during the late afternoon/early evening hours. Some of the
thunderstorm activity, most likely less in severity, may last into
the overnight hours as an upper level low to our north supports
additional synoptic lift. When all the activity ends late
tonight, the added moisture will once again bring another round
of patchy fog and low celings across the High Plains through
Tuesday morning. One other thing, highs today will top out into
the low to mid 80s while lows tonight (Monday night) dip into
the low to mid 50s.

&&

.LONG TERM /TUESDAY THROUGH SUNDAY/...
Issued at 130 PM MDT Sun Jun 21 2026

The long-term period will begin under zonal flow aloft underneath a
flat longwave ridge with numerous embedded vorticity maxima
propagating across SE Wyoming into Western Nebraska. High
temperatures on Tuesday will be cooler than the previous day thanks
to a cold frontal passage during the morning hours which will shift
our surface winds to NNE. Moist, post-frontal upslope flow will
increase our surface dewpoints across SE Wyoming and the Nebraska
Panhandle into the mid to upper 50s combined with 40-50 knot 500 mb
flow and an associated shear-induced vorticity maximum moving across
the area which will set the stage for convective initiation on
Tuesday afternoon. Forecast soundings continue to indicate effective
bulk shear values in excess of 45 knots, so there will be the
potential for a few severe thunderstorms with the addition of 500-
1000 J/Kg of MLCAPE confined to areas east of the I-25 corridor
where the greatest low-level moisture will exist. This lines up with
the Day 3 SPC Convective Outlook which places Cheyenne and other
locations along and south of the I-80 corridor in a marginal risk
for severe weather. Despite sufficient deep-layer shear for
supercells, low and mid-level flow is progged to be quite weak,
lower than 10-15 knots, yielding little to no low-level curvature in
the hodograph. This should limit the overall tornado threat with any
storms, leaving large hail and damaging winds as the main threats
with any supercells. With the cooler post-frontal air mass and
lingering low-level moisture, forecast highs on Tuesday are expected
to be near or slightly below climatology in the mid to upper 70s
mainly east of the Laramie Range, with upper 70s to low 80s to the
west.

The pattern remains active into Wednesday as another shortwave
trough embedded in the zonal flow regime progresses across our area,
providing another source for forcing for ascent. Surface winds turn
to more SE, which will allow for additional theta-e advection and
low-level moistening throughout the day. It is too far out to get
into specifics, but the combination of a lifting mechanism, progged
dewpoints in the mid 50s (resulting in surface-based instability),
and effective bulk shear values greater than 50 knots, there will be
a threat for severe weather on Wednesday as well. SPC has placed
much of SE Wyoming and the Panhandle in a Day 4 risk for severe
weather, so future forecasts will have to be monitored. High
temperatures will again be slightly below climatology mainly in the
low to mid 70s.

Much of the same for Thursday as embedded disturbances continue to
move across our region and consistent signals from ensemble guidance
that low-level moisture will remain in place east of the Laramie
Range. Forecast soundings and medium-range ensembles continue to
show sufficient deep-layer shear and flow aloft for organized
convection, with primary hazards to be ironed out in the coming
days. As we finish off the work week and head into the weekend, the
synoptic-scale flow pattern will become southwesterly downstream of
a rather high-amplitude trough centered over British Columbia and
the Pacific Northwest. PWAT is progged to be at or above the 80th
percentile on Friday, so there will be the possibility for an
additional round of late day afternoon showers and storms. Severe
potential looks low at this time given the lack of shear. A warming
trend will continue into the weekend with mostly dry conditions and
temperatures near or slightly above climatology.

&&

.AVIATION /18Z TAFS THROUGH 18Z TUESDAY/...
Issued at 1107 AM MDT Mon Jun 22 2026

A weather disturbance aloft will move over western Nebraska late this
afternoon and will combine with adequate low and mid level moisture
to produce isolated to scattered afternoon and evening thunderstorms
today across far southeast Wyoming and the Nebraska Panhandle.

Widespread low clouds and fog will occur after midnight tonight along and
east of I-25 including TAF sites at Cheyenne and the Nebraska Panhandle.
MVFR ceilings will continue much of Tuesday morning for TAF sites east
of I-25.

Wyoming TAFS...High confidence in VFR at Laramie and Rawlins, with
sufficient surface gradients to produce wind gusts to 30 knots until 01Z.

For Cheyenne, high confidence in VFR through 08Z, with IFR in low clouds
and fog thereafter and ceilings rising to MVFR after mid morning Tuesday.
Sufficient surface gradients to produce wind gusts to 26 knots until 01Z.

Nebraska TAFS...High confidence in VFR continuing until around 08Z, with
isolated to scattered thunderstorms at each site from 20Z to 02Z,
producing a few wind gusts in excess of 45 knots and visibilities under
three miles at times. High confidence in widespread IFR developing
after 08Z, due to ceiling and visibility restrictions. Visibilities will
improve above six miles after 15Z Tuesday, with ceilings improving to
MVFR.

&&

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

&&

UPDATE...RUBIN
SHORT TERM...RZ
LONG TERM...NB
AVIATION...RUBIN

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Special Weather Statement
National Weather Service Cheyenne WY
105 PM MDT Mon Jun 22 2026

WYZ101-102-221930-
Converse County Lower Elevations WY-Niobrara County WY-
105 PM MDT Mon Jun 22 2026

...A STRONG THUNDERSTORM WILL IMPACT WEST CENTRAL NIOBRARA AND
EASTERN CONVERSE COUNTIES THROUGH 130 PM MDT...

At 105 PM MDT, Doppler radar was tracking a strong thunderstorm near
Manning Ranch, or 27 miles northwest of Lusk, moving east at 30 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...
Lance Creek and Manning Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 4297 10496 4312 10497 4322 10448 4289 10447
TIME...MOT...LOC 1905Z 267DEG 24KT 4303 10485

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

Vasquez

Special Weather Statement
National Weather Service Cheyenne WY
114 PM MDT Mon Jun 22 2026

NEZ020-054-WYZ108-119-221945-
Kimball NE-Banner NE-Goshen County WY-East Laramie County WY-
114 PM MDT Mon Jun 22 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN KIMBALL...
SOUTHWESTERN BANNER...SOUTHERN GOSHEN AND NORTHEASTERN LARAMIE
COUNTIES THROUGH 145 PM MDT...

At 114 PM MDT, Doppler radar was tracking a strong thunderstorm near
Meriden Rest Area, or 35 miles northwest of Kimball, moving southeast
at 25 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...
Albin.

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
the Panhandle of Nebraska...and southeastern Wyoming.

&&

LAT...LON 4153 10429 4160 10424 4153 10389 4133 10402
TIME...MOT...LOC 1914Z 296DEG 20KT 4153 10421

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

Vasquez

Special Weather Statement
National Weather Service Cheyenne WY
121 PM MDT Mon Jun 22 2026

WYZ101-221945-
Converse County Lower Elevations WY-
121 PM MDT Mon Jun 22 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN CONVERSE COUNTY
THROUGH 145 PM MDT...

At 121 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Bill, or 33 miles south of Wright, moving
southeast at 25 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...
Bill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 4322 10556 4333 10548 4327 10507 4307 10528
TIME...MOT...LOC 1921Z 300DEG 21KT 4327 10543

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

Vasquez