Tornado Warning 5, NWS Cheyenne, WY

693 
WWUS55 KCYS 020011
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
611 PM MDT Mon Jun 1 2026

NEC123-020030-
/O.CON.KCYS.TO.W.0005.000000T0000Z-260602T0030Z/
Morrill NE-
611 PM MDT Mon Jun 1 2026

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR
NORTHEASTERN MORRILL COUNTY...

At 611 PM MDT, a severe thunderstorm capable of producing a tornado
was located 16 miles south of Alliance Municipal Airport, or 20 miles
southeast of Alliance, moving east at 20 mph.

HAZARD...Tornado and ping pong ball size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
northeastern Morrill County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4175 10293 4190 10293 4194 10268 4174 10266
      4174 10264 4171 10264
TIME...MOT...LOC 0011Z 267DEG 16KT 4183 10272 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN

$$

Natoli

912 
WWUS55 KCYS 020020
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
620 PM MDT Mon Jun 1 2026

NEC123-020030-
/O.EXP.KCYS.TO.W.0005.000000T0000Z-260602T0030Z/
Morrill NE-
620 PM MDT Mon Jun 1 2026

...THE TORNADO WARNING FOR NORTHEASTERN MORRILL COUNTY WILL EXPIRE AT
630 PM MDT...

The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.

A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
the Panhandle of Nebraska.

Remember, a Severe Thunderstorm Warning still remains in effect for
eastern Morrill County until 645 PM MDT.

&&

LAT...LON 4175 10293 4190 10293 4194 10268 4174 10266
      4174 10264 4171 10264
TIME...MOT...LOC 0020Z 273DEG 27KT 4183 10265 

$$

Natoli

Area Forecast Discussion
National Weather Service Cheyenne WY
536 PM MDT Mon Jun 1 2026

.KEY MESSAGES...

- Monday & Tuesday bring another chance for strong to severe
  thunderstorms in the afternoon and evening. There is a slight
  risk (level 2 of 5) across the eastern high plains on both
  days. Large hail, severe wind, and an isolated tornado
  possible.

- A warming and slight drying trend appears likely after
  Wednesday with temperatures climbing into the 80s by later in
  the week and during next weekend.

&&

.SHORT TERM /THROUGH TUESDAY NIGHT/...
Issued at 1230 PM MDT Mon Jun 1 2026

After some morning showers and thunderstorms that produced hail,
storminess will continue into the afternoon as daytime heating
begins to further destabilize the atmosphere. A stagnant upper-level
low over the Montana/Canada border will allow the CWA to tap into
moisture from the Gulf. Moisture-rich low-level southerly flow will
usher in the necessary humidity needed to fuel storm development
during the afternoon and evening. Lift will come in the form of
vorticity maxes streaming through the area from the trough to the
north. Moderate instability this afternoon with MUCAPE values around
1500 J/kg will create an environment capable of producing severe
storms east of the Laramie Range. Hi-Res guidance shows initially
discrete cells, with effective shear and steep mid-level lapse rates
supporting a large hail threat. As the afternoon progresses into
evening, more outflow dominant storms will lead to a severe wind
threat. Storms will move out of the Nebraska panhandle rather
quickly this evening, with most storms expected to be out of the
area by 9 PM. A few lingering storms could be possible overnight,
but the severe threat will be long gone by then.

With the upper-level low still stuck over the Montana/Canada border,
a similar set up is forecast for Tuesday. The environment remains
largely the same, although with a few small, but important changes.
Model soundings show a lot more instability in the Nebraska
panhandle Tuesday afternoon with MUCAPE values of 2500 J/kg and
higher. However, shear values are rather unimpressive with weak low-
level and effective shear. On top of that, a strong capping
inversion seems to persist through most of the afternoon. Hi-Res
guidance shows storms forming off the high terrain per usual, but
not necessarily strengthening as they enter the more favorable
environment. They are likely also catching onto the cap that
may be in place. Soundings do show the cap eroding by the
evening hours. This is also when the HRRR shows another round of
convection developing off the high terrain and pushing eastward
into the Wyoming high plains, and into the Nebraska panhandle
overnight. These storms do appear stronger, as instability will
persist into the overnight hours. As a result, cannot rule out
severe nocturnal convection from about 8 PM Tuesday through 1 AM
Wednesday. Primary hazards will once again be large hail in
initial discrete cells, transitioning to more of a wind threat
as convection becomes a bit more organized.

&&

.LONG TERM /WEDNESDAY THROUGH MONDAY/...
Issued at 150 PM MDT Sun May 31 2026

We remain under SW flow aloft upstream of a high amplitude
positively-tilted ridge centered over Ontario and the Great Lakes
region, resulting in mostly dry and above-average temperatures
heading into the second half of the week. Thanks to trajectories
stemming from the Gulf of Mexico, PWAT over SE Wyoming and W
Nebraska will be in the 80th-90th percentile relative to
climatology. This will allow for daily chances of showers and
thunderstorms despite the absence of any large-scale forcing for
ascent. Despite anomalously high PWAT, long range ensemble
forecast soundings continue to show large dewpoint depressions
at the surface and inverted-V profiles, so any showers or storms
will likely produce far more wind than any beneficial moisture.
The threat for any severe weather looks to remain low towards
the end of the week as deep-layer shear is weak due to the lack
of mid and upper level flow. Going into the weekend, high
temperatures are expected to push 80 degrees west of the I-25
corridor, with even a few 90s for our Nebraska counties as we
remain under longwave ridging through the end of the long term
period.

&&

.AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/...
Issued at 530 PM MDT Mon Jun 1 2026

Thunderstorms will continue through sunset near or over
Nebraska panhandle TAF sites (namely, BFF, CDR, SNY, and AIA).
Strong winds up to 50 kt, hail, and heavy rain causing ponding
of water are all threats with these strong storms. Brief IFR
conditions are also possible as storm cores move overhead with
heavy rain, thus reducing visibility.

After storms have exited the region to the east after 02/0600Z,
low clouds may develop, especially for locations that received
rainfall this evening. The most likely timeframe for low clouds
and fog is during the early AM hours, shortly before sunrise
(02/0900Z) and lasting until mid-morning (02/1500Z). After this
time, increasing mixing should help dissipate low clouds. Storms
will again develop Tuesday afternoon, with PROB30 groups used
to indicate the locations and timing in the the favored areas.

&&

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

&&

SHORT TERM...SF
LONG TERM...NB
AVIATION...WFO-RIW

Preliminary Local Storm Report
National Weather Service Cheyenne WY
351 PM MDT Mon Jun 1 2026

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

0350 PM     Hail             8 SW South Greeley High 41.00N 104.91W
06/01/2026  M1.00 Inch       Laramie            WY   Trained Spotter

            Trained spotter reports quarter sized hail
            along Interstate 25.

&&

Preliminary Local Storm Report
National Weather Service Cheyenne WY
359 PM MDT Mon Jun 1 2026

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

0356 PM     Hail             1 S Cheyenne            41.13N 104.80W
06/01/2026  E1.00 Inch       Laramie            WY   Public

            Report from mPING: Quarter (1.00 in.).

&&

Preliminary Local Storm Report
National Weather Service Cheyenne WY
408 PM MDT Mon Jun 1 2026

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

0359 PM     Hail             1 SW Cheyenne           41.13N 104.81W
06/01/2026  E0.75 Inch       Laramie            WY   Public

            Report from mPING: Dime (0.75 in.).

0400 PM     Hail             2 E Cheyenne            41.15N 104.76W
06/01/2026  E1.00 Inch       Laramie            WY   Public

            Report from mPING: Quarter (1.00 in.).

0402 PM     Hail             2 NW South Greeley High 41.12N 104.83W
06/01/2026  E1.00 Inch       Laramie            WY   Public

            Report from mPING: Quarter (1.00 in.).

0404 PM     Hail             7 E North Cheyenne      41.18N 104.67W
06/01/2026  E0.50 Inch       Laramie            WY   Public

            Report from mPING: Half-inch (0.50 in.).

&&

Preliminary Local Storm Report
National Weather Service Cheyenne WY
437 PM MDT Mon Jun 1 2026

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

0433 PM     Tornado          9 NE Mitchell           42.03N 103.68W
06/01/2026                   Sioux              NE   Storm Chaser

            Storm chaser reports broad circulation on
            the ground. Another spotter in the area
            reported a brief funnel around the same
            time.

&&

Preliminary Local Storm Report
National Weather Service Cheyenne WY
524 PM MDT Mon Jun 1 2026

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

0441 PM     Tstm Wnd Gst     4 WNW Terrytown         41.87N 103.74W
06/01/2026  M61 MPH          Scotts Bluff       NE   Mesonet

            UPR site gust 61 MPH.

&&

Preliminary Local Storm Report
National Weather Service Cheyenne WY
542 PM MDT Mon Jun 1 2026

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

0538 PM     Hail             7 NE Angora             41.95N 103.01W
06/01/2026  E1.00 Inch       Morrill            NE   Public

            Report from mPING: Quarter (1.00 in.).

&&