Severe Thunderstorm Watch

SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 515
NWS STORM PREDICTION CENTER NORMAN OK
430 PM MDT TUE JUL 15 2025

SEVERE THUNDERSTORM WATCH 515 IS IN EFFECT UNTIL 1000 PM MDT
FOR THE FOLLOWING LOCATIONS

WYC003-013-017-019-025-043-160400-
/O.NEW.KWNS.SV.A.0515.250715T2230Z-250716T0400Z/

WY
.    WYOMING COUNTIES INCLUDED ARE

BIG HORN             FREMONT             HOT SPRINGS
JOHNSON              NATRONA             WASHAKIE
$$


ATTN...WFO...RIW...

Red Flag Warning

URGENT - FIRE WEATHER MESSAGE
National Weather Service Pocatello ID
106 PM MDT Tue Jul 15 2025

IDZ410-411-413-427-160300-
/O.CON.KPIH.FW.W.0005.000000T0000Z-250716T0300Z/
Upper Snake River Valley/Idaho Falls BLM-
Centennial Mountains and Snake River Range/Targhee NF-
Caribou Range/Caribou NF-
Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls
BLM south of the Snake River-
106 PM MDT Tue Jul 15 2025

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING
FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 411, 413,
AND 427...

* AFFECTED AREA...Fire Weather Zone 410 Upper Snake River
  Valley/Idaho Falls BLM, Fire Weather Zone 411 Centennial
  Mountains and Snake River Range/Targhee NF, Fire Weather Zone
  413 Caribou Range/Caribou NF and Fire Weather Zone 427 Goose
  Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls
  BLM south of the Snake River.

* TIMING...Scattered thunderstorms are expected to develop
  during the afternoon and evening hours, supporting the
  potential for gusty outflow winds and frequent lightning.

* WINDS...A dry low level environment will promote the potential
  for storms to produce gusty outflow wind gusts in excess of 40-
   50 mph, locally higher up to around 60 mph.

* RELATIVE HUMIDITY...As low as 15 to 25 percent.

* THUNDERSTORMS...25 to 45 percent coverage expected.

* IMPACTS...Critical fire weather conditions are expected today.
  Lightning may generate new fire starts. Any new fire starts or
  existing fires may spread rapidly.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly based on these criteria
for Southeastern Idaho:

- Relative humidity at or below 15 percent and wind gusts of at
least 25 mph in the mountains, or 30 mph in the Snake Plain.

- Thunderstorm coverage of 25 percent, without specific rainfall
criteria.

&&

$$

Special Weather Statement

Special Weather Statement
National Weather Service Pocatello ID
659 PM MDT Tue Jul 15 2025

IDZ052>055-058-062>064-160130-
Eastern Magic Valley ID-Arco/Mud Lake Desert ID-
Big Hole Mountains ID-Upper Snake River Plain ID-
Marsh and Arbon Highlands ID-Caribou Range ID-Blackfoot Mountains ID-
Lower Snake River Plain ID-
659 PM MDT Tue Jul 15 2025

...GUSTY OUTFLOW WINDS WILL IMPACT SOUTHWESTERN TETON...EASTERN
BLAINE... SOUTHERN JEFFERSON...SOUTHEASTERN BUTTE...NORTHWESTERN
BONNEVILLE... SOUTHERN MADISON AND NORTHERN BINGHAM COUNTIES THROUGH
730 PM MDT...

At 656 PM MDT, Doppler radar was tracking gusty outflow winds along
a line extending from 8 miles west of Taber to 6 miles southeast of
Bone.
Movement was northeast at 50 mph.

HAZARD...Wind gusts of 50 to 55 mph. Blowing dust reducing
         visibility to below 2 miles.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Idaho Falls, Rigby, Ririe Reservoir, Lorenzo, Goshen, Ammon, Shelley,
Iona, Ucon, Menan, Ririe, Roberts, Firth, Lewisville, Atomic City,
Archer, Rose, Southeast Inl, Taber, and Bone.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4377 11281 4371 11139 4320 11169 4327 11301
TIME...MOT...LOC 0056Z 205DEG 44KT 4331 11281 4324 11170

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

$$

AMM

Special Weather Statement
National Weather Service Billings MT
623 PM MDT Tue Jul 15 2025

MTZ138-169-171-WYZ198-199-160115-
Southern Big Horn MT-Bighorn Canyon MT-Sheridan Foothills WY-
Pryor/Northern Bighorn Mountains MT-Northeast Bighorn Mountains
WY-
623 PM MDT Tue Jul 15 2025

...AN AREA OF STRONG THUNDERSTORMS WILL IMPACT SOUTH CENTRAL BIG
HORN AND NORTHWESTERN SHERIDAN COUNTIES UNTIL 715 PM MDT...

At 623 PM MDT, Doppler radar was tracking an area of strong
thunderstorms 26 miles south of Fort Smith, or 55 miles west of
Sheridan, moving east at 35 mph.

HAZARD...Wind gusts up to 30 mph, pea size hail, very heavy rainfall
and frequent lightning.

SOURCE...Radar indicated.

IMPACT...Heavy rainfall may cause minor flooding of small streams
and make rural roads difficult to drive on.

Locations impacted include...
  Ranchester, Dayton, Lodge Grass, Wyola, Parkman, Bighorn Lake and
  northern section of the Elk Burn Scar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

People in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4525 10809 4535 10732 4480 10714 4479 10783
      4482 10782 4487 10786 4491 10785 4493 10788
      4499 10788 4500 10791 4500 10807
TIME...MOT...LOC 0019Z 270DEG 39KT 4494 10806

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

$$

Tesar

Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Riverton WY
106 PM MDT Tue Jul 15 2025

WYZ001>020-022>030-161300-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn Basin-
Owl Creek and Bridger Mountains-Bighorn Mountains West-
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-Teton and Gros Ventre Mountains-
Jackson Hole-Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
106 PM MDT Tue Jul 15 2025

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...This Afternoon and Tonight.

Widespread to numerous thunderstorms develop by mid-afternoon and
continue through the evening, especially east of the Continental
Divide. Strong to severe thunderstorms will be capable of 60 mph
wind gusts, one-half to one inch diameter hail, and periods of heavy
rainfall. West of the Divide, dry showers and thunderstorms will be
capable of gusty outflow 40 to 60 mph through the evening.

A Red Flag Warning is in effect until 8 PM for far southwest Wyoming
due to low relative humidity, gusty wind, and the potential for gusty
outflow wind from showers and thunderstorms.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...A chance for afternoon and evening thunderstorms, mainly
across southern Wyoming.

Friday through Monday...Isolated afternoon and evening thunderstorm
chances each day.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

$$