Alert archive / Wyoming / Flash Flood Warnings in 2023

Flash Flood Warning 5, NWS Riverton, WY

June 26, 2023Johnson County, Wyoming

NWS Riverton, WY issued this flash flood warning at Jun 26, 2023, 8:01 PM MDT for Johnson County, Wyoming. It was in force for 108 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: Jun 26, 2023, 8:01 PM MDT (02:01 UTC)
Expired: Jun 26, 2023, 9:49 PM MDT
In force: 108 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Flood severity: None

County Johnson County, WY

The radar

The Riverton/Lander radar (KRIW), 187 km from the middle of the area, began a volume at 02:03 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 flash flood 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 flash flood warning went out at Jun 26, 5:30 PM MDT, 2 hours 31 minutes earlier.

Area forecast discussion, Jun 26, 5:30 PM MDT, 2 hours 31 minutes before

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Hazardous weather outlook, Jun 26, 1:03 AM MDT, 18 hours 58 minutes before

Hazardous Weather Outlook
National Weather Service Riverton WY
103 AM MDT Mon Jun 26 2023

WYZ001>020-022>030-271115-
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-
103 AM MDT Mon Jun 26 2023

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Tonight.

Strong to marginally severe thunderstorms are expected to develop
early afternoon Monday off the Bighorns in Johnson County before
quickly pushing to the east of the CWA by late afternoon. The main
severe weather threats will be larger hail over the size of quarters
and damaging winds up to 60 mph. Tornado threat is low but locally
heavy rainfall is possible as well in areas of entraining storms or
rain showers that linger through the evening across much of the
northern half of the CWA. Any lingering rain showers and
thunderstorms will weaken towards sunset Monday evening.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Tuesday will see similar conditions as Monday but less of a severe
weather chance with weaker parameters expected. The severe weather
threat will be limited to Johnson County again during peak heating of
the afternoon being shortlived in the process. Lingering scattered
rain showers and isolated thunderstorms for the northern half of the
CWA east of the Divide expected once again into the evening hours
diminishing towards sunset once again.

Unsettled weather continues through the remainder of the long term
with scattered rain showers and isolated thunderstorms but severe
weather probability is low after Tuesday at this point in time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

In the hours before

Special weather statement, Jun 26, 5:55 PM MDT, 2 hours 6 minutes before

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Special weather statement, Jun 26, 6:12 PM MDT, 1 hour 49 minutes before

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Special weather statement, Jun 26, 6:40 PM MDT, 1 hour 21 minutes before

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Special weather statement, Jun 26, 6:44 PM MDT, 1 hour 17 minutes before

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Special weather statement, Jun 26, 7:30 PM MDT, 31 minutes before

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Special weather statement, Jun 26, 7:48 PM MDT, 13 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
Jun 26, 6:00 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs	18 min
Jun 26, 6:12 PM MDT	Special Weather Statement	RIW	Natrona	33 min
Jun 26, 6:12 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Washakie	29 min
Jun 26, 6:13 PM MDT	Severe Thunderstorm Warning	RIW	Washakie	32 min
Jun 26, 6:17 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Washakie	12 min
Jun 26, 6:39 PM MDT	Severe Thunderstorm Warning	RIW	Johnson, Washakie	36 min
Jun 26, 6:40 PM MDT	Special Weather Statement	RIW	Washakie	20 min
Jun 26, 6:44 PM MDT	Special Weather Statement	RIW	Natrona	31 min
Jun 26, 7:08 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	37 min
Jun 26, 7:30 PM MDT	Special Weather Statement	RIW	Johnson	45 min
Jun 26, 7:48 PM MDT	Special Weather Statement	RIW	Natrona	27 min
Jun 26, 8:19 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	26 min
Jun 27, 8:07 AM MDT	Special Weather Statement	RIW		23 min
Jun 27, 12:05 PM MDT	Special Weather Statement	RIW		25 min
Jun 27, 12:31 PM MDT	Special Weather Statement	RIW	Johnson	14 min
Jun 27, 12:49 PM MDT	Special Weather Statement	RIW	Johnson	26 min
Jun 27, 1:02 PM MDT	Special Weather Statement	RIW	Johnson	13 min
Jun 27, 1:22 PM MDT	Special Weather Statement	RIW	Lincoln	38 min
Jun 27, 1:36 PM MDT	Special Weather Statement	RIW	Hot Springs	24 min
Jun 27, 1:48 PM MDT	Special Weather Statement	RIW	Johnson	27 min
Jun 27, 1:59 PM MDT	Special Weather Statement	RIW	Johnson	16 min
Jun 27, 2:13 PM MDT	Special Weather Statement	RIW		17 min
Jun 27, 2:43 PM MDT	Special Weather Statement	RIW	Natrona	32 min
Jun 27, 3:37 PM MDT	Special Weather Statement	RIW	Natrona	23 min
Jun 27, 3:46 PM MDT	Special Weather Statement	RIW	Hot Springs	14 min
Jun 27, 3:56 PM MDT	Special Weather Statement	RIW	Natrona	34 min
Jun 27, 4:11 PM MDT	Special Weather Statement	RIW	Natrona	34 min
Jun 27, 4:27 PM MDT	Special Weather Statement	RIW	Natrona	18 min

Nearby

Flash Flood Warnings in Wyoming, 2023 Every flash flood warning in 2023

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.