Alert archive / Wyoming / Special Weather Statements in 2021
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Jul 31, 2021, 3:26 PM MDT for Lincoln County, Wyoming. It was in force for 34 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 31, 2021, 3:26 PM MDT (21:26 UTC)
- Expired
- Jul 31, 2021, 4:00 PM MDT
- In force
- 34 min
- Issued by
- NWS Riverton, WY
County Lincoln County, WY
The radar
The Salt Lake City radar (KMTX), 164 km from the middle of the area, began a volume at 21:27 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, 9.4 hours before the alert went out and 156 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
- 149 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 1716 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 76 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 31, 11:54 AM MDT, 3 hours 32 minutes earlier.
Area forecast discussion, Jul 31, 11:54 AM MDT, 3 hours 32 minutes before
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</html>Hazardous weather outlook, Jul 31, 3:16 AM MDT, 12 hours 10 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 316 AM MDT Sat Jul 31 2021 WYZ001>020-022>030-010930- 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- 316 AM MDT Sat Jul 31 2021 ...Flash Flood Watch remains in effect for areas west of the Divide through this Evening... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Numerous thunderstorms are likely this afternoon and evening along and west of the Divide. Some thunderstorms may produce locally heavy rainfall. A Flash Flood Watch covers the area with the highest potential to see localized flash flooding. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Sunday and Monday...Showers and thunderstorms are likely. The main hazard will be locally heavy rainfall, which could cause localized flash flooding. Tuesday...Scattered afternoon and evening thunderstorms. Thursday...Isolated to scattered thunderstorms possible over the north and northwest. .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 31, 3:26 PM MDT, 0 minutes before
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Please try again in a few minutes.
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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 |
|---|---|---|---|---|
| Jul 30, 6:18 PM MDT | Flash Flood Warning | RIW | Sweetwater | 3 hr |
| Jul 30, 6:31 PM MDT | Areal Flood Advisory | RIW | Natrona | 119 min |
| Jul 30, 7:18 PM MDT | Special Weather Statement | RIW | 27 min | |
| Jul 30, 7:56 PM MDT | Special Weather Statement | RIW | 34 min | |
| Jul 30, 8:25 PM MDT | Flash Flood Warning | RIW | Fremont, Natrona | 3 hr |
| Jul 30, 8:34 PM MDT | Special Weather Statement | RIW | 26 min | |
| Jul 30, 8:45 PM MDT | Special Weather Statement | RIW | Johnson | 30 min |
| Jul 30, 9:45 PM MDT | Special Weather Statement | RIW | Fremont | 30 min |
| Jul 31, 1:41 PM MDT | Areal Flood Advisory | RIW | Big Horn | 3 hr |
| Jul 31, 3:31 PM MDT | Special Weather Statement | RIW | 29 min | |
| Jul 31, 3:48 PM MDT | Areal Flood Advisory | RIW | Lincoln | 36 min |
| Jul 31, 3:58 PM MDT | Special Weather Statement | RIW | Fremont | 32 min |
| Jul 31, 4:10 PM MDT | Flash Flood Warning | RIW | Lincoln | 4 hr |
| Jul 31, 4:21 PM MDT | Special Weather Statement | RIW | Lincoln | 24 min |
| Jul 31, 4:45 PM MDT | Areal Flood Advisory | RIW | Fremont | 60 min |
| Jul 31, 5:03 PM MDT | Special Weather Statement | RIW | Teton | 42 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.