Alert archive / Wyoming / Winter Storm Warnings in 2020
Winter Storm Warning 9, NWS Riverton, WY
NWS Riverton, WY issued this winter storm warning at Sep 7, 2020, 4:34 AM MDT for 9 counties in Wyoming. It took effect at Sep 7, 2020, 12:00 PM MDT. It was in force for 30 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 7, 2020, 4:34 AM MDT (10:34 UTC)
- In effect from
- Sep 7, 2020, 12:00 PM MDT
- Expired
- Sep 8, 2020, 6:00 PM MDT
- In force
- 30 hr
- Issued by
- NWS Riverton, WY
Counties Big Horn County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Natrona County, WY, Park County, WY, Sublette County, WY, Sweetwater County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 47 km from the middle of the area, began a volume at 10:35 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.
What forecasters said that day
The local office's own words before this winter storm 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 winter storm warning went out at Sep 6, 10:41 PM MDT, 5 hours 53 minutes earlier.
Area forecast discussion, Sep 6, 10:41 PM MDT, 5 hours 53 minutes before
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</html>Hazardous weather outlook, Sep 7, 4:29 AM MDT, 5 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 429 AM MDT Mon Sep 7 2020 WYZ001>020-022>030-081030- 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- 429 AM MDT Mon Sep 7 2020 ...Red Flag Warning continues through this evening across southern Wyoming... ...Multiple Winter Storm Warnings and Advisories Across the Area this Afternoon through Tuesday, see individual products for details... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Critical fire weather conditions across southern portions. Please see the red flag warning product for more details. A strong cold front will push across the Cowboy State. Significant precipitation is expected with this system east of the Divide, especially overnight tonight. Significant snow possible in the mountains east of the Divide as well as central Wyoming. Please see the winter weather statements for more details. Widespread freezes are expected tonight and Tuesday night. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Tuesday...Winter weather will continue for portions of central and southern Wyoming. Strong to high northeast winds are expected across southern Wyoming, especially along the I-80 corridor. Tuesday night...Widespread frost and freezes are expected Tuesday night. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions, according to standard operating procedure.
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 4:34 AM MDT | Winter Weather Advisory | RIW | Fremont, Hot Springs, Johnson, Lincoln, Park, Sublette and 1 more | 37 hr |
| Sep 7, 11:25 AM MDT | High Wind Warning | RIW | Lincoln, Sublette, Teton | 17 hr |
Nearby
Winter Storm Warnings in Wyoming, 2020Every winter storm 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; radar from the NEXRAD Level II archive.