Alert archive / Wyoming / Special Weather Statements in 2021

Special Weather Statement, NWS Riverton, WY

June 4, 2021Hot Springs County, Wyoming

NWS Riverton, WY issued this special weather statement at Jun 4, 2021, 2:39 PM MDT for Hot Springs County, Wyoming. It was in force for 36 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
Jun 4, 2021, 2:39 PM MDT (20:39 UTC)
Expired
Jun 4, 2021, 3:15 PM MDT
In force
36 min
Issued by
NWS Riverton, WY

County Hot Springs County, WY

The radar

The Riverton/Lander radar (KRIW), 37 km from the middle of the area, began a volume at 20:39 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 12:00Z, 8.7 hours before the alert went out and 34 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-pSkew-T log-p diagram, Riverton, WY at 12:00Z on 2021-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2021-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3179 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
-5 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jun 4, 2:31 PM MDT, 8 minutes earlier.

Area forecast discussion, Jun 4, 2:31 PM MDT, 8 minutes before
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Hazardous weather outlook, Jun 4, 2:30 AM MDT, 12 hours 9 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
230 AM MDT Fri Jun 4 2021

WYZ001>020-022>030-050830-
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-
230 AM MDT Fri Jun 4 2021

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Unseasonably warm with daytime highs climbing to the 90s to around
100 in the lower elevations. Active snowmelt in the mountains
will result in rising water on creeks, streams, and rivers.

Isolated showers and thunderstorms with strong winds possible in
northern Wyoming this afternoon and evening.

.DAYS TWO THROUGH SEVEN...Saturday through Wednesday

Saturday through Tuesday...Elevated fire weather conditions are
possible across much of the area. Mountain snowmelt continues
with rising water levels on creeks, streams, and rivers.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions.

In the hours before

Special weather statement, Jun 4, 2:24 PM MDT, 15 minutes before
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Special weather statement, Jun 4, 2:32 PM MDT, 7 minutes before
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Special weather statement, Jun 4, 2:39 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 8:24 AM MDTFlood WatchRIWBig Horn, Fremont, Hot Springs, Johnson, Natrona, Park and 1 more3 days
Jun 4, 2:24 PM MDTSpecial Weather StatementRIWHot Springs36 min
Jun 4, 2:32 PM MDTSpecial Weather StatementRIWBig Horn28 min
Jun 4, 2:47 PM MDTSpecial Weather StatementRIWBig Horn28 min
Jun 4, 3:00 PM MDTSpecial Weather StatementRIWHot Springs30 min

Nearby

Special Weather Statements in Wyoming, 2021Every 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.