Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 93, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jul 26, 2023, 2:41 PM MDT for Fremont County, Wyoming. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 26, 2023, 2:41 PM MDT (20:41 UTC)
- Expired
- Jul 26, 2023, 3:30 PM MDT
- In force
- 49 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Fremont County, WY
The radar
The Riverton/Lander radar (KRIW), 13 km from the middle of the area, began a volume at 20:44 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 nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 8.7 hours before the alert went out and 435 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 24 J/kg
- Mixed-layer CIN
- -325 J/kg
- Mixed-layer LCL
- 2677 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 26, 12:23 PM MDT, 2 hours 18 minutes earlier.
Area forecast discussion, Jul 26, 12:23 PM MDT, 2 hours 18 minutes before
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Hazardous Weather Outlook National Weather Service Riverton WY 243 AM MDT Wed Jul 26 2023 WYZ001>020-022>030-271300- Yellowstone National Park-Absaroka Mountains-Cody Foothills- North Big Horn Basin-Southwest Big Horn Basin- Southeast Big Horn 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- 243 AM MDT Wed Jul 26 2023 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Isolated to widely scattered afternoon and evening showers and thunderstorms, mainly in the southern half of the area. Strong wind gusts are the main threat from any storm. Locally elevated fire weather possible this afternoon. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Thursday...Scattered afternoon thunderstorms. Some storms could be strong to locally severe. Friday through Sunday...Elevated fire weather possible for much of the period with hot temperatures, breezy conditions and low humidity. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures.
In the hours before
Special weather statement, Jul 26, 1:03 PM MDT, 1 hour 38 minutes before
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Special Weather Statement
National Weather Service Riverton WY
106 PM MDT Wed Jul 26 2023
WYZ025-026-261930-
Upper Green River Basin-Upper Green River Basin Foothills-
106 PM MDT Wed Jul 26 2023
...Strong thunderstorms will impact portions of south central
Sublette County through 130 PM MDT...
At 105 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles south of Daniel to 9 miles southwest of
Boulder to 13 miles east of Marbleton. Movement was northeast at 25
mph.
HAZARD...Winds in excess of 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Pinedale, Boulder and Boulder Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
If on or near a lake, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.
&&
LAT...LON 4298 10990 4298 10988 4279 10962 4251 10947
4241 10986 4277 11013
TIME...MOT...LOC 1905Z 233DEG 23KT 4277 11002 4268 10989 4253 10984
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
MyersSpecial weather statement, Jul 26, 1:29 PM MDT, 1 hour 12 minutes before
Special Weather Statement
National Weather Service Riverton WY
129 PM MDT Wed Jul 26 2023
WYZ028-029-262000-
Flaming Gorge-Rock Springs and Green River-
129 PM MDT Wed Jul 26 2023
...A strong thunderstorm will impact portions of west central
Sweetwater County through 200 PM MDT...
At 128 PM MDT, Doppler radar was tracking a strong thunderstorm near
Green River, moving northeast at 35 mph.
HAZARD...Winds in excess of 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This strong thunderstorm will be near...
Green River around 140 PM MDT.
Other locations in the path of this storm include southwestern Rock
Springs.
This includes Interstate 80 between mile markers 86 and 101.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
If on or near Flaming Gorge Reservoir, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 4134 10959 4143 10964 4170 10946 4151 10916
4146 10918 4144 10924 4141 10924 4132 10950
TIME...MOT...LOC 1928Z 230DEG 29KT 4144 10950
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
MyersSpecial weather statement, Jul 26, 1:59 PM MDT, 42 minutes before
Special Weather Statement
National Weather Service Riverton WY
159 PM MDT Wed Jul 26 2023
WYZ015>019-262030-
Wind River Basin-Upper Wind River Basin-Wind River Mountains
East-Green Mountains and Rattlesnake Range-Lander Foothills-
159 PM MDT Wed Jul 26 2023
...Strong thunderstorms will impact portions of central Fremont
County through 230 PM MDT...
At 158 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles west of Crowheart to Upper Silas Lake.
Movement was east at 40 mph.
HAZARD...Winds in excess of 40 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Strong thunderstorms will be near...
Fiddlers Lake, Upper Silas Lake, Frye Lake, Christina Lake and
Worthen Meadows Reservoir around 205 PM MDT.
Louis Lake and Sinks Canyon State Park around 210 PM MDT.
Other locations in the path of these storms include Red Canyon,
Lander, and Diversion Dam Rest Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Very heavy rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
These storms 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.
If on or near Bull Lake and Ray Lake, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.
&&
LAT...LON 4340 10952 4341 10891 4259 10838 4259 10898
TIME...MOT...LOC 1958Z 276DEG 36KT 4333 10940 4265 10896
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
McDonaldSpecial weather statement, Jul 26, 2:36 PM MDT, 5 minutes before
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</html>The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 12:26 PM MDT | Special Weather Statement | RIW | Sublette | 34 min |
| Jul 26, 12:37 PM MDT | Special Weather Statement | RIW | Sublette | 23 min |
| Jul 26, 1:06 PM MDT | Special Weather Statement | RIW | Sublette | 24 min |
| Jul 26, 1:29 PM MDT | Special Weather Statement | RIW | Sweetwater | 31 min |
| Jul 26, 1:59 PM MDT | Special Weather Statement | RIW | Fremont | 31 min |
| Jul 26, 2:26 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 34 min |
| Jul 26, 2:36 PM MDT | Special Weather Statement | RIW | 24 min | |
| Jul 26, 3:12 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Hot Springs, Natrona, Washakie | 48 min |
| Jul 26, 3:13 PM MDT | Special Weather Statement | RIW | Sweetwater | 47 min |
| Jul 26, 3:19 PM MDT | Special Weather Statement | RIW | Hot Springs | 26 min |
| Jul 26, 3:42 PM MDT | Special Weather Statement | RIW | 33 min | |
| Jul 26, 3:48 PM MDT | Special Weather Statement | RIW | Washakie | 27 min |
| Jul 26, 3:55 PM MDT | Special Weather Statement | RIW | 35 min | |
| Jul 26, 4:00 PM MDT | Special Weather Statement | RIW | Natrona | 30 min |
| Jul 26, 4:13 PM MDT | Special Weather Statement | RIW | Natrona | 47 min |
| Jul 26, 4:41 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 34 min |
| Jul 26, 4:45 PM MDT | Special Weather Statement | RIW | Natrona | 30 min |
| Jul 26, 5:17 PM MDT | Special Weather Statement | RIW | Natrona | 28 min |
| Jul 26, 5:36 PM MDT | Special Weather Statement | RIW | Johnson | 39 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2023Every severe thunderstorm warning in 2023
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.