Alert archive / Wyoming / Special Weather Statements in 2021
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Jun 4, 2021, 6:03 PM MDT. It was in force for 27 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
- Jun 4, 2021, 6:03 PM MDT (00:03 UTC)
- Expired
- Jun 4, 2021, 6:30 PM MDT
- In force
- 27 min
- Issued by
- NWS Riverton, WY
The radar
The Pocatello radar (KSFX), 223 km from the middle of the area, began a volume at 00:06 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
Great_falls, MT (KTFX), launched 00:00Z, 0.1 hours before the alert went out and 320 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
- 460 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 2772 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
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 Jun 4, 5:25 PM MDT, 38 minutes earlier.
Area forecast discussion, Jun 4, 5:25 PM MDT, 38 minutes before
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</html>Hazardous weather outlook, Jun 4, 2:30 AM MDT, 15 hours 33 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 230 AM MDT Fri Jun 4 2021 WYZ001>020-022>030-050830- 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- 230 AM MDT Fri Jun 4 2021 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight Unseasonably warm with daytime highs climbing to the 90s to around 100 in the lower elevations. Active snowmelt in the mountains will result in rising water on creeks, streams, and rivers. Isolated showers and thunderstorms with strong winds possible in northern Wyoming this afternoon and evening. .DAYS TWO THROUGH SEVEN...Saturday through Wednesday Saturday through Tuesday...Elevated fire weather conditions are possible across much of the area. Mountain snowmelt continues with rising water levels on creeks, streams, and rivers. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions.
In the hours before
Special weather statement, Jun 4, 2:24 PM MDT, 3 hours 39 minutes before
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</html>Special weather statement, Jun 4, 2:32 PM MDT, 3 hours 31 minutes before
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</html>Special weather statement, Jun 4, 2:39 PM MDT, 3 hours 24 minutes before
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</html>Special weather statement, Jun 4, 2:47 PM MDT, 3 hours 16 minutes before
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</html>Special weather statement, Jun 4, 3:00 PM MDT, 3 hours 3 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 |
|---|---|---|---|---|
| Jun 4, 6:34 PM MDT | Special Weather Statement | RIW | 26 min | |
| Jun 5, 3:48 PM MDT | Special Weather Statement | RIW | 27 min | |
| Jun 5, 4:16 PM MDT | Special Weather Statement | RIW | 29 min | |
| Jun 5, 4:39 PM MDT | Special Weather Statement | RIW | 36 min | |
| Jun 5, 5:24 PM MDT | Special Weather Statement | RIW | 36 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.