Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 2, NWS Riverton, WY

May 17, 2023Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at May 17, 2023, 1:59 PM MDT for Natrona 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 17, 2023, 1:59 PM MDT (19:59 UTC)
Expired: May 17, 2023, 2:45 PM MDT
In force: 46 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 137 km from the middle of the area, began a volume at 19:59 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, 1:53 PM MDT, 6 minutes earlier.

Area forecast discussion, May 17, 1:53 PM MDT, 6 minutes before

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Hazardous weather outlook, May 17, 1:54 AM MDT, 12 hours 5 minutes before

Hazardous Weather Outlook
National Weather Service Riverton WY
154 AM MDT Wed May 17 2023

WYZ001>020-022>030-181200-
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-
154 AM MDT Wed May 17 2023

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

A Cold front passes through the area today, which will bring rain
showers and thunderstorms, plus gusty northerly winds east of the
Continental Divide. Minor flooding continues across western valleys.

.DAYS TWO THROUGH SEVEN...Thursday through Wednesday.

Thursday...Another cold front sweeps through areas east of the
Continental Divide. Showers and thunderstorms become more
widespread.

Friday...Isolated thunderstorms are possible in western mountains.

Saturday through Wednesday...Above normal temperatures. Mountain
snowmelt increases, resulting in rising water levels. Rivers and
creeks across the far west and near foothill locations are most
likely to be impacted. Isolated thunderstorms are possible,
especially west of the Continental Divide.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed this afternoon or tonight.

In the hours before

Special weather statement, May 17, 12:56 PM MDT, 1 hour 3 minutes before

Special Weather Statement
National Weather Service Riverton WY
1256 PM MDT Wed May 17 2023

WYZ020-171945-
Natrona County Lower Elevations-
1256 PM MDT Wed May 17 2023

...A strong thunderstorm will impact portions of central Natrona
County through 145 PM MDT...

At 1255 PM MDT, Doppler radar was tracking a strong thunderstorm near
Powder River, or 34 miles northwest of Casper, moving southeast at 20
mph.

HAZARD...Winds in excess of 30 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  Goldeneye Reservoir.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4314 10702 4319 10692 4301 10657 4285 10685
TIME...MOT...LOC 1855Z 318DEG 18KT 4310 10692

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH

Wittmann

Special weather statement, May 17, 1:41 PM MDT, 18 minutes before

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Local storm report, May 17, 1:47 PM MDT, 12 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, 7:35 AM MDT	River Flood Advisory	RIW	Lincoln	6 days
May 17, 12:56 PM MDT	Special Weather Statement	RIW	Natrona	49 min
May 17, 1:41 PM MDT	Special Weather Statement	RIW	Natrona	49 min
May 17, 2:40 PM MDT	Special Weather Statement	RIW	Natrona	35 min
May 17, 3:39 PM MDT	Special Weather Statement	RIW	Natrona	51 min
May 17, 4:51 PM MDT	Special Weather Statement	RIW	Natrona	24 min
May 17, 5:13 PM MDT	Special Weather Statement	RIW	Natrona	32 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2023 Every severe thunderstorm 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.