Alert archive / Wyoming / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 6, NWS Riverton, WY

May 17, 2018Johnson County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at May 17, 2018, 6:08 PM MDT for Johnson County, Wyoming. It was in force for 22 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: May 17, 2018, 6:08 PM MDT (00:08 UTC)
Expired: May 17, 2018, 6:30 PM MDT
In force: 22 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Johnson County, WY

The radar

The Riverton/Lander radar (KRIW), 187 km from the middle of the area, began a volume at 00:12 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 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 May 17, 4:03 PM MDT, 2 hours 5 minutes earlier.

Area forecast discussion, May 17, 4:03 PM MDT, 2 hours 5 minutes before

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Hazardous weather outlook, May 17, 2:00 AM MDT, 16 hours 8 minutes before

Hazardous Weather Outlook
National Weather Service Riverton WY
200 AM MDT Thu May 17 2018

WYZ001>020-022>030-181100-
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-
200 AM MDT Thu May 17 2018

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Isolated to widely scattered thunderstorm this afternoon and
evening.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Friday...Isolated to scattered afternoon and evening
thunderstorms. A steady rain, possibly heavy at times, is possible
in central Wyoming Friday afternoon and Friday night.

Sunday...Isolated to scattered afternoon and evening
thunderstorms mainly over and near the western mountains.

Monday through Wednesday...Isolated to scattered mainly afternoon
and evening thunderstorms across the area. A few strong storms are
possible Tuesday and Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotters are urged to report hail and wind gusts past 45 mph.
Thank you.

In the hours before

Special weather statement, May 17, 3:54 PM MDT, 2 hours 14 minutes before

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Special weather statement, May 17, 4:22 PM MDT, 1 hour 46 minutes before

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Special weather statement, May 17, 4:43 PM MDT, 1 hour 25 minutes before

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Special weather statement, May 17, 5:01 PM MDT, 1 hour 7 minutes before

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Special weather statement, May 17, 5:51 PM MDT, 17 minutes before

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Special weather statement, May 17, 5:57 PM MDT, 11 minutes before

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The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 6:39 PM MDT	Special Weather Statement	RIW	Johnson	36 min
May 18, 12:57 PM MDT	Special Weather Statement	RIW	Lincoln	48 min
May 18, 1:19 PM MDT	Special Weather Statement	RIW		41 min
May 18, 1:24 PM MDT	Special Weather Statement	RIW	Johnson	51 min
May 18, 1:51 PM MDT	Special Weather Statement	RIW		39 min
May 18, 1:57 PM MDT	Special Weather Statement	RIW	Sweetwater	48 min
May 18, 2:46 PM MDT	Special Weather Statement	RIW	Sweetwater	44 min
May 18, 2:48 PM MDT	Special Weather Statement	RIW	Natrona	42 min
May 18, 3:33 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	21 min
May 18, 3:34 PM MDT	Special Weather Statement	RIW	Sweetwater	41 min
May 18, 3:46 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	44 min
May 18, 4:11 PM MDT	Special Weather Statement	RIW	Sweetwater	34 min
May 18, 4:58 PM MDT	Special Weather Statement	RIW		47 min
May 18, 5:10 PM MDT	Special Weather Statement	RIW	Fremont	35 min
May 18, 5:45 PM MDT	Special Weather Statement	RIW	Fremont	45 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2018 Every severe thunderstorm warning in 2018

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.