Alert archive / Wyoming / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 20, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jun 7, 2020, 12:25 PM MDT for Lincoln County, Wyoming. It was in force for 33 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
- Jun 7, 2020, 12:25 PM MDT (18:25 UTC)
- Expired
- Jun 7, 2020, 12:58 PM MDT
- In force
- 33 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Lincoln County, WY
The radar
The Salt Lake City radar (KMTX), 186 km from the middle of the area, began a volume at 18:29 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
Salt Lake City I, UT (KSLC), launched 12:00Z, 6.4 hours before the alert went out and 195 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1485 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 193 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 Jun 7, 11:30 AM MDT, 55 minutes earlier.
Area forecast discussion, Jun 7, 11:30 AM MDT, 55 minutes before
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</html>Hazardous weather outlook, Jun 7, 11:15 AM MDT, 1 hour 10 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 1115 AM MDT Sun Jun 7 2020 WYZ001>020-022>030-081300- 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- 1115 AM MDT Sun Jun 7 2020 ...A Slight Risk of Severe Thunderstorms Today for Portions of Southern and Central Wyoming... ...Winter Weather Advisory for Teton and Gros Ventre Mountains and Yellowstone Tonight and Monday Morning... ...Freeze Warning Tonight for the lower elevations of Western Wyoming... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Rest of Today and Tonight Showers and thunderstorms will become widespread this afternoon and evening. Some of the thunderstorms could be severe east of a line from around Kemmerer to Riverton to Greybull. The main hazard will be damaging winds. Attention then turns to northwest Wyoming where accumulating snow will fall in the western mountains mainly tonight into Monday morning. The most significant impacts will be across the Teton and Gros Ventre Mountains as well as Yellowstone National Park. Low temperatures will drop below freezing in the lower elevations of western Wyoming tonight. .DAYS TWO THROUGH SEVEN...Monday through Saturday Monday...Isolated to scattered showers and thunderstorms. Higher elevation snow gradually ends in most locations by Monday night. Friday and Saturday...Above normal temperatures, gusty southwest wind, and low relative humidity could lead to elevated fire weather conditions across southwest and central Wyoming. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions, especially wind gusts and wind damage.
In the hours before
Special weather statement, Jun 7, 11:57 AM MDT, 28 minutes before
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</html>Special weather statement, Jun 7, 12:10 PM MDT, 15 minutes before
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
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</html>Special weather statement, Jun 7, 12:15 PM MDT, 10 minutes before
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<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.
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If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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 |
|---|---|---|---|---|
| Jun 6, 6:10 PM MDT | Special Weather Statement | RIW | Fremont | 35 min |
| Jun 6, 6:22 PM MDT | Special Weather Statement | RIW | Teton | 23 min |
| Jun 7, 2:22 AM MDT | Winter Weather Advisory | RIW | Fremont, Lincoln, Park, Sublette, Teton | 30 hr |
| Jun 7, 2:30 AM MDT | Freeze Watch | RIW | Fremont, Lincoln, Sublette, Sweetwater, Teton | 9 hr |
| Jun 7, 11:15 AM MDT | Freeze Warning | RIW | Fremont, Lincoln, Sublette, Sweetwater, Teton | 22 hr |
| Jun 7, 11:57 AM MDT | Special Weather Statement | RIW | Uinta | 33 min |
| Jun 7, 12:10 PM MDT | Special Weather Statement | RIW | Lincoln, Sublette | 65 min |
| Jun 7, 12:15 PM MDT | Special Weather Statement | RIW | Lincoln, Sublette | 60 min |
| Jun 7, 12:39 PM MDT | Special Weather Statement | RIW | 36 min | |
| Jun 7, 1:09 PM MDT | Special Weather Statement | RIW | Sublette | 51 min |
| Jun 7, 1:27 PM MDT | Special Weather Statement | RIW | 48 min | |
| Jun 7, 1:52 PM MDT | Special Weather Statement | RIW | 53 min | |
| Jun 7, 2:11 PM MDT | Special Weather Statement | RIW | Fremont | 49 min |
| Jun 7, 2:22 PM MDT | Special Weather Statement | RIW | Sweetwater | 38 min |
| Jun 7, 2:25 PM MDT | Special Weather Statement | RIW | Natrona | 65 min |
| Jun 7, 2:42 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 33 min |
| Jun 7, 3:35 PM MDT | Special Weather Statement | RIW | Fremont | 55 min |
| Jun 7, 4:13 PM MDT | Special Weather Statement | RIW | 32 min | |
| Jun 7, 4:20 PM MDT | Special Weather Statement | RIW | Washakie | 55 min |
| Jun 7, 5:06 PM MDT | Special Weather Statement | RIW | Natrona | 24 min |
| Jun 7, 5:23 PM MDT | Special Weather Statement | RIW | 37 min | |
| Jun 7, 5:32 PM MDT | Special Weather Statement | RIW | Natrona | 28 min |
| Jun 7, 5:55 PM MDT | Special Weather Statement | RIW | Natrona | 35 min |
| Jun 7, 5:59 PM MDT | Special Weather Statement | RIW | Natrona | 31 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2020Every severe thunderstorm warning in 2020
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.