Alert archive / Wyoming / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 7, NWS Riverton, WY

June 6, 2019Lincoln County, Sublette County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 6, 2019, 6:58 PM MDT for Lincoln County, Sublette County, Wyoming. It was in force for 32 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 6, 2019, 6:58 PM MDT (00:58 UTC)
Expired
Jun 6, 2019, 7:30 PM MDT
In force
32 min
Issued by
NWS Riverton, WY
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Lincoln County, WY, Sublette County, WY

The radar

The Riverton/Lander radar (KRIW), 160 km from the middle of the area, began a volume at 01:01 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 6, 1:54 PM MDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 1.0 hours before the alert went out and 235 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, Salt Lake City I, UT at 00:00Z on 2019-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 98 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 00:00Z on 2019-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.193958Sfc1 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
98 J/kg
Mixed-layer CIN
-151 J/kg
Mixed-layer LCL
2717 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Jun 6, 3:36 PM MDT, 3 hours 22 minutes earlier.

Area forecast discussion, Jun 6, 3:36 PM MDT, 3 hours 22 minutes before
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Hazardous weather outlook, Jun 6, 3:49 AM MDT, 15 hours 9 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
349 AM MDT Thu Jun 6 2019

WYZ001>020-022>030-071200-
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-
349 AM MDT Thu Jun 6 2019

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Scattered thunderstorms in the west. A few thunderstorms could be
strong to severe over the west late in the afternoon into the
evening hours.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Warm temperatures Thursday and Friday will continue the higher
elevation snowmelt resulting in rising water levels in creeks,
streams, and rivers into this weekend.

Friday...A chance of thunderstorms west and north. Mainly
isolated thunderstorms elsewhere. Some thunderstorms could be
strong in Johnson County. Windy many locations. Rain will turn to
snow in the mountains Friday night with 2 to 3 inches of snow
expected in Yellowstone Park and 1 to 2 inches expected above 9000
feet in the Teton Range and the Wind River Mountains.

Saturday...A chance of thunderstorms the central and north with
isolated activity in the south.

.SPOTTER INFORMATION STATEMENT...

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

TEAM RIVERTON

In the hours before

Special weather statement, Jun 6, 5:16 PM MDT, 1 hour 42 minutes before
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Local storm report, Jun 6, 5:19 PM MDT, 1 hour 39 minutes before
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Special weather statement, Jun 6, 5:57 PM MDT, 1 hour 1 minute before
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Special weather statement, Jun 6, 6:18 PM MDT, 40 minutes before
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Special weather statement, Jun 6, 6:38 PM MDT, 20 minutes before
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Special weather statement, Jun 6, 6:49 PM MDT, 9 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 6, 6:18 PM MDTSpecial Weather StatementRIW42 min
Jun 6, 6:38 PM MDTSpecial Weather StatementRIWLincoln37 min
Jun 6, 6:49 PM MDTSpecial Weather StatementRIWTeton41 min
Jun 6, 7:04 PM MDTSpecial Weather StatementRIW41 min
Jun 6, 7:18 PM MDTSpecial Weather StatementRIWSublette27 min
Jun 6, 7:27 PM MDTSpecial Weather StatementRIWLincoln33 min
Jun 6, 7:30 PM MDTSpecial Weather StatementRIWSublette30 min
Jun 6, 7:52 PM MDTSpecial Weather StatementRIW38 min
Jun 6, 7:54 PM MDTSpecial Weather StatementRIWSublette51 min
Jun 6, 8:05 PM MDTSpecial Weather StatementRIWSublette40 min
Jun 6, 8:35 PM MDTSpecial Weather StatementRIWFremont, Hot Springs40 min
Jun 6, 9:03 PM MDTSpecial Weather StatementRIWTeton42 min
Jun 6, 9:17 PM MDTSpecial Weather StatementRIWFremont, Hot Springs43 min
Jun 6, 9:53 PM MDTSpecial Weather StatementRIWFremont52 min
Jun 7, 9:38 AM MDTAreal Flood AdvisoryRIWFremont24 hr
Jun 7, 2:32 PM MDTSpecial Weather StatementRIWBig Horn43 min
Jun 7, 4:50 PM MDTSpecial Weather StatementRIWJohnson25 min
Jun 7, 5:21 PM MDTSpecial Weather StatementRIW24 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2019Every severe thunderstorm warning in 2019

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.