Alert archive / Wyoming / Special Weather Statements in 2021
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Jul 15, 2021, 1:09 PM MDT for Sublette County, Wyoming. It was in force for 36 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 15, 2021, 1:09 PM MDT (19:09 UTC)
- Expired
- Jul 15, 2021, 1:45 PM MDT
- In force
- 36 min
- Issued by
- NWS Riverton, WY
County Sublette County, WY
The radar
The Riverton/Lander radar (KRIW), 149 km from the middle of the area, began a volume at 19:11 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, 7.2 hours before the alert went out and 155 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
- 345 J/kg
- Mixed-layer CIN
- -183 J/kg
- Mixed-layer LCL
- 1860 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- 71 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 15, 11:25 AM MDT, 1 hour 44 minutes earlier.
Area forecast discussion, Jul 15, 11:25 AM MDT, 1 hour 44 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.
</p>
</section>
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<script src="index.js"></script>
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</html>Hazardous weather outlook, Jul 15, 5:29 AM MDT, 7 hours 40 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 529 AM MDT Thu Jul 15 2021 WYZ001>020-022>030-161130- 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- 529 AM MDT Thu Jul 15 2021 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Isolated to widely scattered thunderstorms possible across the area this afternoon and evening. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Friday...Isolated thunderstorms possible across the area. Saturday through Tuesday...Hot, with record high temperatures possible. .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 15, 1:09 PM MDT, 0 minutes before
Special Weather Statement National Weather Service Riverton WY 109 PM MDT Thu Jul 15 2021 WYZ026-151945- Upper Green River Basin- 109 PM MDT Thu Jul 15 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SUBLETTE COUNTY UNTIL 145 PM MDT... At 108 PM MDT, Doppler radar was tracking a strong thunderstorm over Big Piney, moving southeast at 10 mph. Pea size hail and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Big Piney around 120 PM MDT. Marbleton around 125 PM MDT. Other locations impacted by this storm include Sublette County Fairgrounds and Big Piney Marbleton Airport. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && LAT...LON 4254 11032 4267 11015 4254 10987 4235 11012 TIME...MOT...LOC 1908Z 313DEG 8KT 4256 11017 TL
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 1:17 PM MDT | Special Weather Statement | RIW | 28 min | |
| Jul 15, 1:34 PM MDT | Special Weather Statement | RIW | 26 min | |
| Jul 15, 2:00 PM MDT | Special Weather Statement | RIW | 30 min | |
| Jul 15, 2:02 PM MDT | Special Weather Statement | RIW | 28 min | |
| Jul 15, 2:02 PM MDT | Special Weather Statement | RIW | 28 min | |
| Jul 15, 2:23 PM MDT | Special Weather Statement | RIW | Fremont | 37 min |
| Jul 15, 2:26 PM MDT | Special Weather Statement | RIW | Lincoln | 34 min |
| Jul 15, 2:58 PM MDT | Special Weather Statement | RIW | Fremont | 32 min |
| Jul 15, 3:02 PM MDT | Special Weather Statement | RIW | Johnson | 28 min |
| Jul 15, 3:32 PM MDT | Special Weather Statement | RIW | Fremont | 28 min |
| Jul 15, 3:33 PM MDT | Red Flag Warning | RIW | Fremont, Hot Springs, Johnson, Lincoln, Natrona, Park and 5 more | 29 hr |
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.