Alert archive / Wyoming / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 22, NWS Riverton, WY

May 27, 2018Big Horn County, Park County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at May 27, 2018, 6:29 PM MDT for Big Horn County, Park County, Wyoming. It was in force for 46 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 27, 2018, 6:29 PM MDT (00:29 UTC)
Expired: May 27, 2018, 7:15 PM MDT
In force: 46 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Big Horn County, WY, Park County, WY

The radar

The Billings radar (KBLX), 149 km from the middle of the area, began a volume at 00:31 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 27, 4:43 PM MDT, 1 hour 46 minutes earlier.

Area forecast discussion, May 27, 4:43 PM MDT, 1 hour 46 minutes before

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Hazardous weather outlook, May 27, 2:42 AM MDT, 15 hours 47 minutes before

Hazardous Weather Outlook
National Weather Service Riverton WY
242 AM MDT Sun May 27 2018

WYZ001>020-022>030-281100-
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-
242 AM MDT Sun May 27 2018

...Flash Flood Watch in effect from noon through this evening for
Natrona and Johnson Counties...

...Flood Watch from this morning through Monday afternoon...

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms developing over most
of the area. Locally heavy rainfall is possible and will elevate
the flood threat along rivers and creeks already running high from
snowmelt. Isolated strong to severe thunderstorms are possible.

.DAYS TWO THROUGH SEVEN...Memorial Day through Saturday

Memorial Day...Scattered showers and thunderstorms developing
over most of the area. Locally heavy rain may elevate the flood
threat along rivers and creeks already running high from snowmelt.

Tuesday...Isolated to scattered showers and thunderstorms across
the area.

Thursday and Friday...Isolated to scattered showers and
thunderstorms mainly in the north and west.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, May 27, 5:17 PM MDT, 1 hour 12 minutes before

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Special weather statement, May 27, 5:21 PM MDT, 1 hour 8 minutes before

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Local storm report, May 27, 5:28 PM MDT, 1 hour 1 minute before

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Local storm report, May 27, 5:50 PM MDT, 39 minutes before

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Local storm report, May 27, 5:52 PM MDT, 37 minutes before

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Local storm report, May 27, 5:57 PM MDT, 32 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 27, 7:33 PM MDT	Special Weather Statement	RIW	Park	42 min
May 27, 8:15 PM MDT	Special Weather Statement	RIW	Park	45 min
May 28, 8:58 AM MDT	Areal Flood Warning	RIW	Johnson	24 hr
May 28, 9:27 AM MDT	Areal Flood Warning	RIW	Johnson	16 hr
May 28, 1:51 PM MDT	Special Weather Statement	RIW		39 min
May 28, 2:16 PM MDT	Special Weather Statement	RIW	Sweetwater	44 min
May 28, 2:28 PM MDT	Special Weather Statement	RIW	Sweetwater	47 min
May 28, 3:11 PM MDT	Special Weather Statement	RIW	Sweetwater	49 min
May 28, 3:22 PM MDT	Special Weather Statement	RIW		38 min
May 28, 3:33 PM MDT	Flash Flood Warning	RIW	Sweetwater	2 hr
May 28, 3:50 PM MDT	Special Weather Statement	RIW	Sweetwater	40 min
May 28, 4:17 PM MDT	Areal Flood Advisory	RIW	Sweetwater	3 hr
May 28, 4:21 PM MDT	Special Weather Statement	RIW	Natrona	39 min
May 28, 5:25 PM MDT	Special Weather Statement	RIW		50 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.