Alert archive / Wyoming / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 18, NWS Riverton, WY

July 24, 2022Big Horn County, Park County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 24, 2022, 8:48 PM MDT for Big Horn County, Park County, Wyoming. It was in force for 87 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 24, 2022, 8:48 PM MDT (02:48 UTC)
Expired
Jul 24, 2022, 10:15 PM MDT
In force
87 min
Issued by
NWS Riverton, WY
Area
Storm-based polygon
Damage threat
Considerable
Hail
0.75 in
Wind
70.0 mph

Counties Big Horn County, WY, Park County, WY

The radar

The Billings radar (KBLX), 149 km from the middle of the area, began a volume at 02:48 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

Riverton, WY (KRIW), launched 00:00Z, 2.8 hours before the alert went out and 165 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.

Skew-T log-pSkew-T log-p diagram, Riverton, WY at 00:00Z on 2022-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 00:00Z on 2022-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 125 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
5040 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
125 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 24, 4:50 PM MDT, 3 hours 58 minutes earlier.

Area forecast discussion, Jul 24, 4:50 PM MDT, 3 hours 58 minutes before
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Hazardous weather outlook, Jul 24, 4:42 AM MDT, 16 hours 6 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
442 AM MDT Sun Jul 24 2022

WYZ001>020-022>030-251045-
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-
442 AM MDT Sun Jul 24 2022

...Red Flag Warning in Effect This Afternoon and Evening Across
portions of Teton and Lincoln counties...

This Hazardous Weather Outlook is for Western and Central
Wyoming.

.DAY ONE...Today and Tonight.

Elevated to critical fire danger in the west. Scattered showers
and thunderstorms over Sweetwater county and east of the Divide. A
few storms could be strong with hail and damaging wind gusts.

A cold front with a shift to strong north winds gusting 35 to 50
mph east of the Divide during the evening and early overnight.
The Bighorn Canyon Recreation Area in Big Horn County could see
locally higher wind gusts around and just after sunset as strong
outflow winds push though the steep terrain features.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Elevated fire weather conditions are likely each afternoon and
evening through mid-week, with no appreciable widespread wetting
precipitation in the forecast.

.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 24, 3:35 PM MDT, 5 hours 13 minutes before
Special Weather Statement
National Weather Service Riverton WY
335 PM MDT Sun Jul 24 2022

WYZ004-006-008-242200-
North Big Horn Basin-Southeast Big Horn Basin-Bighorn Mountains West-
335 PM MDT Sun Jul 24 2022

...A strong thunderstorm will impact portions of southeastern Big
Horn County through 400 PM MDT...

At 335 PM MDT, Doppler radar was tracking a strong thunderstorm near
Hyattville, or 16 miles northwest of Ten Sleep, moving northeast at
20 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 damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Hyattville around 350 PM MDT.

Other locations in the path of this storm include Medicine Lodge
Archaeological Site and Paintrock Canyon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4412 10762 4418 10783 4446 10777 4433 10735
TIME...MOT...LOC 2135Z 215DEG 18KT 4420 10770

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

Rowe
Special weather statement, Jul 24, 4:18 PM MDT, 4 hours 30 minutes before
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Local storm report, Jul 24, 4:32 PM MDT, 4 hours 16 minutes before
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Special weather statement, Jul 24, 4:47 PM MDT, 4 hours 1 minute before
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Special weather statement, Jul 24, 5:35 PM MDT, 3 hours 13 minutes before
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Special weather statement, Jul 24, 5:57 PM MDT, 2 hours 51 minutes before
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The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 24, 7:25 PM MDTSpecial Weather StatementRIW35 min
Jul 24, 8:31 PM MDTSpecial Weather StatementRIW29 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2022Every severe thunderstorm warning in 2022

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.