Alert archive / Wyoming / Special Weather Statements in 2021
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Jul 5, 2021, 5:14 PM MDT for Fremont County, Wyoming. It was in force for 31 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
- Jul 5, 2021, 5:14 PM MDT (23:14 UTC)
- Expired
- Jul 5, 2021, 5:45 PM MDT
- In force
- 31 min
- Issued by
- NWS Riverton, WY
County Fremont County, WY
The radar
The Riverton/Lander radar (KRIW), 13 km from the middle of the area, began a volume at 23:19 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 12:00Z, 11.2 hours before the alert went out and 9 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
- -300 J/kg
- Mixed-layer LCL
- 1993 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>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 Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Jul 5, 2:50 PM MDT, 2 hours 24 minutes earlier.
Area forecast discussion, Jul 5, 2:50 PM MDT, 2 hours 24 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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</html>Hazardous weather outlook, Jul 5, 4:49 AM MDT, 12 hours 25 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 449 AM MDT Mon Jul 5 2021 WYZ001>020-022>030-061100- 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- 449 AM MDT Mon Jul 5 2021 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Scattered to numerous showers and thunderstorms are expected this afternoon and evening, especially across northwest Wyoming. Brief gusty winds are possible near any showers. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
In the hours before
Special weather statement, Jul 5, 2:04 PM MDT, 3 hours 10 minutes before
Special Weather Statement National Weather Service Riverton WY 204 PM MDT Mon Jul 5 2021 WYZ012-013-024-052030- Jackson Hole-Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 204 PM MDT Mon Jul 5 2021 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN LINCOLN AND SOUTH CENTRAL TETON COUNTIES UNTIL 230 PM MDT... At 203 PM MDT, Doppler radar was tracking a strong thunderstorm near Hoback, or 13 miles northeast of Alpine, moving east at 20 mph. Pea size hail and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Hoback around 220 PM MDT. Other locations impacted by this storm include Hoback Campground. PRECAUTIONARY/PREPAREDNESS ACTIONS... Brief heavy rainfall is also occurring with this storm. Persons in campgrounds should consider seeking sturdy shelter until this storm passes. && LAT...LON 4321 11087 4337 11087 4340 11055 4313 11058 TIME...MOT...LOC 2003Z 274DEG 15KT 4328 11082 Vorst
Special weather statement, Jul 5, 2:15 PM MDT, 2 hours 59 minutes before
Special Weather Statement National Weather Service Riverton WY 215 PM MDT Mon Jul 5 2021 WYZ012-013-052030- Jackson Hole-Teton and Gros Ventre Mountains- 215 PM MDT Mon Jul 5 2021 ...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL TETON COUNTY UNTIL 230 PM MDT... At 215 PM MDT, Doppler radar was tracking a strong thunderstorm over Moran Junction, moving east at 25 mph. Pea size hail and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Buffalo Valley Ranch around 225 PM MDT. Other locations impacted by this storm include Hatchet Campground, Togwotee Mountain Lodge and Buffalo Ranger Station. PRECAUTIONARY/PREPAREDNESS ACTIONS... Brief heavy rainfall is also occurring with this storm. Persons in campgrounds should consider seeking sturdy shelter until this storm passes. && LAT...LON 4375 11050 4386 11057 4404 11027 4380 11014 TIME...MOT...LOC 2015Z 248DEG 23KT 4382 11048 Vorst
Special weather statement, Jul 5, 3:26 PM MDT, 1 hour 48 minutes before
Special Weather Statement National Weather Service Riverton WY 326 PM MDT Mon Jul 5 2021 WYZ023-024-052145- Star Valley-Salt River and Wyoming Ranges- 326 PM MDT Mon Jul 5 2021 ...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL LINCOLN COUNTY UNTIL 345 PM MDT... At 326 PM MDT, Doppler radar was tracking a strong thunderstorm over Afton, moving east at 25 mph. Pea size hail and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Corral Creek Guard Station around 345 PM MDT. Other locations impacted by this storm include Fairview, Afton Municipal Airport and Lincoln County Fairgrounds. PRECAUTIONARY/PREPAREDNESS ACTIONS... Brief heavy rainfall is also occurring with this storm. Persons in campgrounds should consider seeking sturdy shelter until this storm passes. && LAT...LON 4263 11097 4276 11102 4290 11067 4267 11058 TIME...MOT...LOC 2126Z 251DEG 20KT 4270 11091 Vorst
Special weather statement, Jul 5, 4:58 PM MDT, 16 minutes before
Special Weather Statement National Weather Service Riverton WY 458 PM MDT Mon Jul 5 2021 WYZ015-017-018-052330- Wind River Basin-Wind River Mountains East-Lander Foothills- 458 PM MDT Mon Jul 5 2021 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL FREMONT COUNTY UNTIL 530 PM MDT... At 456 PM MDT, Doppler radar was tracking strong thunderstorms along a line extending from near Diversion Dam Rest Area to near Fiddlers Lake. Movement was northeast at 15 mph. Pea size hail and winds in excess of 40 mph will be possible with these storms. Strong thunderstorms will be near... Pilot Butte Reservoir around 525 PM MDT. Lander around 530 PM MDT. Other locations impacted by these storms include Lander Hunt Field and Sinks Canyon Campground. PRECAUTIONARY/PREPAREDNESS ACTIONS... Brief heavy rainfall is also occurring with this storm. Persons in campgrounds should consider seeking sturdy shelter until these storms pass. && LAT...LON 4331 10868 4271 10849 4264 10880 4321 10901 TIME...MOT...LOC 2256Z 213DEG 12KT 4319 10898 4266 10881 Vorst
Special weather statement, Jul 5, 5:14 PM MDT, 0 minutes before
Special Weather Statement National Weather Service Riverton WY 514 PM MDT Mon Jul 5 2021 WYZ007-017>019-052345- Owl Creek and Bridger Mountains-Wind River Basin-Green Mountains and Rattlesnake Range-Lander Foothills- 514 PM MDT Mon Jul 5 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN HOT SPRINGS AND CENTRAL FREMONT COUNTIES UNTIL 545 PM MDT... At 514 PM MDT, Doppler radar was tracking strong thunderstorms along a line extending from near Pilot Butte Reservoir to near Red Canyon. Movement was northeast at 50 mph. Pea size hail and wind gusts of 50 to 55 mph will be possible with these storms. Strong thunderstorms will be near... Pavillion around 520 PM MDT. Sand Draw around 540 PM MDT. Other locations impacted by these storms include Arapahoe Elementary School, Midvale, St Stephens, Riverton Landfill, Fremont County Fairgrounds and Riverton Regional Airport. PRECAUTIONARY/PREPAREDNESS ACTIONS... Brief heavy rainfall is also occurring with this storm. If on or near Ocean 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 4353 10820 4276 10792 4264 10865 4327 10885 TIME...MOT...LOC 2314Z 244DEG 42KT 4326 10883 4269 10861 Vorst
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 6:06 PM MDT | Special Weather Statement | RIW | Park | 24 min |
| Jul 4, 7:47 PM MDT | Special Weather Statement | RIW | Fremont | 28 min |
| Jul 4, 8:19 PM MDT | Special Weather Statement | RIW | Fremont | 26 min |
| Jul 5, 2:04 PM MDT | Special Weather Statement | RIW | 26 min | |
| Jul 5, 2:15 PM MDT | Special Weather Statement | RIW | Teton | 15 min |
| Jul 5, 3:26 PM MDT | Special Weather Statement | RIW | 19 min | |
| Jul 5, 4:58 PM MDT | Special Weather Statement | RIW | Fremont | 32 min |
| Jul 5, 5:25 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 35 min |
Nearby
Special Weather Statements in Wyoming, 2021Every special weather statement in 2021
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.