Alert archive / Wyoming / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 28, NWS Riverton, WY

August 4, 2010Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Aug 4, 2010, 3:17 PM MDT for Natrona County, Wyoming. It was in force for 28 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
Aug 4, 2010, 3:17 PM MDT (21:17 UTC)
Expired
Aug 4, 2010, 3:45 PM MDT
In force
28 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 21:17 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

Grand Junction, CO (KGJT), launched 12:00Z, 9.3 hours before the alert went out and 449 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, Grand Junction, CO at 12:00Z on 2010-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 868 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, Grand Junction, CO at 12:00Z on 2010-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 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
868 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
1590 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
83 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 6:26 PM MDTSpecial Weather StatementRIWHot Springs49 min
Aug 3, 6:48 PM MDTSpecial Weather StatementRIWHot Springs42 min
Aug 3, 7:18 PM MDTSpecial Weather StatementRIWHot Springs42 min
Aug 3, 8:37 PM MDTAreal Flood AdvisoryRIWSweetwater113 min
Aug 4, 9:18 AM MDTSpecial Weather StatementRIWLincoln42 min
Aug 4, 10:14 AM MDTSpecial Weather StatementRIWSublette46 min
Aug 4, 12:25 PM MDTSpecial Weather StatementRIW50 min
Aug 4, 12:26 PM MDTSpecial Weather StatementRIWFremont49 min
Aug 4, 12:58 PM MDTSpecial Weather StatementRIWFremont47 min
Aug 4, 1:41 PM MDTSpecial Weather StatementRIW49 min
Aug 4, 2:21 PM MDTSevere Thunderstorm WarningRIWHot Springs, Park27 min
Aug 4, 2:28 PM MDTSevere Thunderstorm WarningRIWNatrona47 min
Aug 4, 2:41 PM MDTSpecial Weather StatementRIWNatrona49 min
Aug 4, 2:56 PM MDTSpecial Weather StatementRIW49 min
Aug 4, 3:11 PM MDTSpecial Weather StatementRIWNatrona34 min
Aug 4, 3:52 PM MDTSpecial Weather StatementRIW23 min
Aug 4, 4:00 PM MDTSpecial Weather StatementRIW45 min
Aug 4, 4:29 PM MDTSpecial Weather StatementRIWSublette31 min
Aug 4, 4:45 PM MDTSpecial Weather StatementRIW45 min
Aug 4, 5:00 PM MDTAreal Flood AdvisoryRIWFremont3 hr

Nearby

Severe Thunderstorm Warnings in Wyoming, 2010Every severe thunderstorm warning in 2010

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.