Alert archive / Wyoming / Special Weather Statements in 2024

Special Weather Statement, NWS Billings, MT

August 6, 2024Sheridan County, Wyoming

NWS Billings, MT issued this special weather statement at Aug 6, 2024, 4:21 PM MDT for Sheridan County, Wyoming. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 6, 2024, 4:21 PM MDT (22:21 UTC)
Expired: Aug 6, 2024, 5:00 PM MDT
In force: 39 min
Issued by: NWS Billings, MT
Hail: 0.50 in
Wind: 40

County Sheridan County, WY

The radar

The Billings radar (KBLX), 168 km from the middle of the area, began a volume at 22:25 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.

The text

As transmitted.

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What forecasters said that day

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

NWS Billings, MT wrote its last area forecast discussion before this special weather statement went out at Aug 6, 1:52 PM MDT, 2 hours 29 minutes earlier.

Area forecast discussion, Aug 6, 1:52 PM MDT, 2 hours 29 minutes before

Area Forecast Discussion
National Weather Service Billings MT
152 PM MDT Tue Aug 6 2024

.DISCUSSION...

This afternoon through Wednesday Night...

Main forecast concerns are on the potential for severe thunderstorms
this afternoon into this evening, then focus turns to cooler
temperatures and shower chances, along with a few thunderstorms, on
Wednesday.

A series of shortwave impulses push across the region late this
afternoon and evening providing the upper level support for showers
and thunderstorms. Convective allowing models (CAMS) are in good
agreement this afternoon indicating convection will get going over
the higher terrain/western areas of the forecast area in the 2 to 4
PM timeframe then push eastward through the late afternoon and
evening hours. Forecast soundings show inverted-V soundings across
much of the forecast area with MUCAPE values of 500 to 800 J/kg, but
with deeper mixing anticipating lower values. 0-6 KM Bulk Shear
Vectors increase into the 40 to 50 kt range late this afternoon into
this evening, so this could support organized storms, but the big
limiting factor will be the lack of CAPE.  Given these factors
anticipate the main threat from the storms being severe wind gusts
in excess of 60 mph. Additional  weak shortwave activity overhead
could trigger additional isolated showers and storm overnight, but
the main activity should push east of the region by midnight.

On Wednesday the main trough pushes in from the northwest bringing
much cooler air to the region.  CAPE and shear profiles could
support isolated strong thunderstorms with the potential for hail.
HREF CAMS also support this idea and show helicity tracks over the
forecast area. If these trends continue we will trend our forecast
and messaging toward the potential for isolated strong to severe
storms Wednesday afternoon.
JW

Thursday through Tuesday...

A cold high pressure system to our east Thursday will allow
northerly/northeasterly winds to create strong cold air advection
across the region. Thursday will be the coldest day over the long
term with anomalously low temperatures in the low 70s for most.
These values are 15-20 degrees below average for this time of year
providing relief from the heat. Friday will also see cool
temperatures in the 70s before 500mb heights start to rise and
temperatures return to slightly below average in the low 80s for
the weekend.

Persistent 850mb easterly/southeasterly winds will keep above
average moisture values present throughout the long term.
Precipitation chances Thursday through Friday will be mostly in
the higher terrain. Saturday/Sunday a wave moves through bringing
more significant and widespread precipitation chances (40-60%).
This trend will continue early next week with daily 20-30%
chances. This active week ahead is giving most of the region a
50-70% chance of receiving greater than 0.5 inches of
precipitation over the next 7 days. The convective and showery
nature of this precipitation will lead to more localized amounts.
Torgerson

&&

.AVIATION...

Thunderstorm potential exists for all terminals today, beginning
at KLVM and moving west through KBHK through the afternoon and
evening. Main threat from these storms will be gusts to 70 mph
(most likely out of the west to southwest), with large hail and
heavy rain also possible. As storms reach KBIl and move east,
expect outflow to produce ahead or alongside of the storms with
similar gust potential. A storm going directly over a terminal
could locally produce MVFR to IFR conditions due to low visibility
from heavy rain and strong winds. While all severe storms will be
out of the area by 05z, weaker storms do have a small chance to
pop up behind them.

TS Potential Times

KBIL: 22z-02z
KLVM: 20z-01z
KMLS: 01z-06z
KSHR: 22z-03z

Vertz/Torgerson

&&

.PRELIMINARY POINT TEMP/POPS...

    Wed     Thu     Fri     Sat     Sun     Mon     Tue
-----------------------------------------------------------
BIL 061/075 056/071 053/077 055/083 058/083 057/085 057/087
    76/T    42/W    11/B    23/W    55/T    33/W    23/W
LVM 053/080 048/070 044/075 046/082 049/082 048/083 049/086
    36/T    53/T    23/T    46/T    66/T    34/T    24/T
HDN 059/076 052/072 050/078 053/083 055/083 055/085 055/088
    66/T    42/W    11/B    23/T    55/T    33/W    22/W
MLS 061/071 051/070 047/074 054/082 058/080 057/082 057/085
    66/T    10/U    10/U    12/T    55/T    33/W    22/W
4BQ 063/076 053/071 050/075 054/083 058/082 057/083 058/087
    64/T    21/B    11/B    13/T    56/T    43/T    22/T
BHK 058/071 046/070 043/075 048/080 053/077 054/081 054/084
    65/T    10/U    00/U    01/B    45/T    43/T    22/W
SHR 056/076 049/067 046/077 050/083 052/083 052/085 052/087
    46/T    76/T    33/T    24/T    55/T    34/T    23/T

&&

.BYZ WATCHES/WARNINGS/ADVISORIES...
MT...None.
WY...None.

&&

weather.gov/billings

In the hours before

Special weather statement, Aug 6, 3:03 PM MDT, 1 hour 18 minutes before

Special Weather Statement
National Weather Service Billings MT
303 PM MDT Tue Aug 6 2024

MTZ057-138-169-171-062130-
Bighorn Canyon MT-Southern Big Horn MT-Northern Big Horn MT-
Pryor/Northern Bighorn Mountains MT-
303 PM MDT Tue Aug 6 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN BIG HORN AND EAST
CENTRAL CARBON COUNTIES THROUGH 330 PM MDT...

At 302 PM MDT, Doppler radar was tracking a strong thunderstorm 14
miles southeast of Pryor, or 30 miles north of Lovell, moving east at
65 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could blow around unsecured objects. Minor hail
         damage to vegetation is possible.

Locations impacted include...
Pryor, Fort Smith, St. Xavier, and Crow Indian Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4515 10852 4543 10857 4554 10757 4524 10747
TIME...MOT...LOC 2102Z 259DEG 57KT 4527 10829

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

Torgerson

Special weather statement, Aug 6, 3:30 PM MDT, 51 minutes before

Special Weather Statement
National Weather Service Billings MT
330 PM MDT Tue Aug 6 2024

MTZ138-169-171-062215-
Bighorn Canyon MT-Southern Big Horn MT-
Pryor/Northern Bighorn Mountains MT-
330 PM MDT Tue Aug 6 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN BIG HORN AND
EASTERN CARBON COUNTIES THROUGH 415 PM MDT...

At 329 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles southwest of Fort Smith, or 29 miles northeast of Lovell,
moving east at 30 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could blow around unsecured objects. Minor hail
         damage to vegetation is possible.

Locations impacted include...
Fort Smith, St. Xavier, and Crow Indian Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4509 10817 4549 10817 4549 10752 4500 10758
TIME...MOT...LOC 2129Z 273DEG 25KT 4518 10805

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

Torgerson

Special weather statement, Aug 6, 4:21 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Billings MT
421 PM MDT Tue Aug 6 2024

MTZ138-WYZ198-199-062300-
Southern Big Horn MT-Northeast Bighorn Mountains WY-
Sheridan Foothills WY-
421 PM MDT Tue Aug 6 2024

...STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN BIG HORN AND CENTRAL
SHERIDAN COUNTIES THROUGH 500 PM MDT...

At 420 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles northwest of Dayton to 9 miles
southeast of Granite Pass. Movement was southeast at 35 mph.

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

SOURCE...Radar indicated.

IMPACT...Gusty winds could blow around unsecured objects. Minor hail
         damage to vegetation is possible.

Locations impacted include...
Sheridan, Ranchester, Dayton, Big Horn, Parkman, Banner, and Story.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until midnight MDT for
north central Wyoming.

&&

LAT...LON 4459 10738 4460 10742 4508 10743 4502 10668
      4456 10667 4456 10737
TIME...MOT...LOC 2220Z 294DEG 32KT 4499 10737 4455 10736

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

Torgerson

The office that day

Everything else NWS Billings, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 6, 3:03 PM MDT	Special Weather Statement	BYZ	Big Horn	27 min
Aug 6, 3:30 PM MDT	Special Weather Statement	BYZ	Big Horn	45 min
Aug 6, 4:32 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Stillwater, Yellowstone	43 min
Aug 6, 5:14 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Big Horn, Yellowstone	61 min
Aug 6, 5:27 PM MDT	Severe Thunderstorm Warning	BYZ	Park, Sweet Grass	37 min
Aug 6, 5:48 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Big Horn, Rosebud	57 min

Nearby

Special Weather Statements in Wyoming, 2024 Every special weather statement in 2024

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.