Alert archive / Wyoming / Special Weather Statements in 2021

Special Weather Statement, NWS Riverton, WY

August 21, 2021Washakie County, Wyoming

NWS Riverton, WY issued this special weather statement at Aug 21, 2021, 10:59 PM MDT for Washakie County, Wyoming. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 21, 2021, 10:59 PM MDT (04:59 UTC)
Expired: Aug 21, 2021, 11:30 PM MDT
In force: 31 min
Issued by: NWS Riverton, WY
Hail: 0.25 in
Wind: 40

County Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 104 km from the middle of the area, began a volume at 05:02 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.

The nearest sounding before it

Riverton, WY (KRIW), launched 00:00Z, 5.0 hours before the alert went out and 100 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 53 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 2263 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 21, 10:50 PM MDT, 9 minutes earlier.

Area forecast discussion, Aug 21, 10:50 PM MDT, 9 minutes before

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Hazardous weather outlook, Aug 21, 6:00 PM MDT, 4 hours 59 minutes before

Hazardous Weather Outlook
National Weather Service Riverton WY
600 PM MDT Sat Aug 21 2021

WYZ001>020-022>030-221300-
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-
600 PM MDT Sat Aug 21 2021

This Hazardous Weather Outlook is for Western and Central
Wyoming.

.DAY ONE...Tonight

Showers and thunderstorms will continue off-and-on Saturday
evening and into the early morning hours Sunday. Some of the
stronger thunderstorms could produce small hail and gusty outflow
wind of 35 to 45 mph.

.DAYS THREE THROUGH SEVEN...Sunday through Friday

Sunday and Monday...Elevated fire weather conditions each
afternoon mainly over southern Lincoln, Sweetwater, southeast
Fremont and Natrona counties.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

In the hours before

Special weather statement, Aug 21, 9:42 PM MDT, 1 hour 17 minutes before

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Special weather statement, Aug 21, 10:06 PM MDT, 53 minutes before

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Special weather statement, Aug 21, 10:30 PM MDT, 29 minutes before

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Special weather statement, Aug 21, 10:36 PM MDT, 23 minutes before

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Local storm report, Aug 21, 10:51 PM MDT, 8 minutes before

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Special weather statement, Aug 21, 10:59 PM MDT, 0 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
Aug 21, 7:14 PM MDT	Special Weather Statement	RIW	Lincoln	31 min
Aug 21, 7:45 PM MDT	Special Weather Statement	RIW	Lincoln	30 min
Aug 21, 8:24 PM MDT	Special Weather Statement	RIW		36 min
Aug 21, 8:51 PM MDT	Special Weather Statement	RIW		24 min
Aug 21, 9:11 PM MDT	Severe Thunderstorm Warning	RIW	Sublette, Sweetwater	34 min
Aug 21, 9:42 PM MDT	Special Weather Statement	RIW		33 min
Aug 21, 10:06 PM MDT	Special Weather Statement	RIW	Fremont	24 min
Aug 21, 10:30 PM MDT	Special Weather Statement	RIW	Fremont	30 min
Aug 21, 10:36 PM MDT	Special Weather Statement	RIW	Hot Springs	24 min
Aug 21, 11:03 PM MDT	Special Weather Statement	RIW		27 min
Aug 21, 11:42 PM MDT	Special Weather Statement	RIW	Natrona	33 min
Aug 22, 12:38 PM MDT	Red Flag Warning	RIW	Fremont, Hot Springs, Johnson, Natrona, Sweetwater, Washakie	31 hr

Nearby

Special Weather Statements in Wyoming, 2021 Every special weather statement in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.