Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 86, NWS Riverton, WY

July 24, 2008Johnson County, Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 24, 2008, 4:19 PM MDT for Johnson County, Natrona County, Wyoming. It was in force for 41 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
Jul 24, 2008, 4:19 PM MDT (22:19 UTC)
Expired
Jul 24, 2008, 5:00 PM MDT
In force
41 min
Issued by
NWS Riverton, WY
Area
Storm-based polygon

Counties Johnson County, WY, Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 152 km from the middle of the area, began a volume at 22:21 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

Rapid City, SD (KUNR), launched 12:00Z, 10.3 hours before the alert went out and 312 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, Rapid City, SD at 12:00Z on 2008-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 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, Rapid City, SD at 12:00Z on 2008-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 square meters per square second.1939587897Sfc1 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
53 J/kg
Mixed-layer CIN
-334 J/kg
Mixed-layer LCL
2123 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
-18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 6:28 PM MDTSpecial Weather StatementRIW32 min
Jul 23, 6:45 PM MDTSpecial Weather StatementRIWJohnson45 min
Jul 23, 8:38 PM MDTSpecial Weather StatementRIWJohnson52 min
Jul 24, 12:08 AM MDTSpecial Weather StatementRIWWashakie52 min
Jul 24, 1:05 AM MDTSpecial Weather StatementRIWJohnson55 min
Jul 24, 1:12 AM MDTSpecial Weather StatementRIWJohnson63 min
Jul 24, 3:08 AM MDTSpecial Weather StatementRIWJohnson67 min
Jul 24, 6:06 AM MDTSpecial Weather StatementRIWTeton39 min
Jul 24, 6:41 AM MDTSpecial Weather StatementRIW64 min
Jul 24, 7:34 AM MDTSpecial Weather StatementRIW56 min
Jul 24, 12:18 PM MDTSpecial Weather StatementRIW57 min
Jul 24, 1:33 PM MDTSpecial Weather StatementRIWJohnson27 min
Jul 24, 1:48 PM MDTSpecial Weather StatementRIWFremont57 min
Jul 24, 2:13 PM MDTSpecial Weather StatementRIWWashakie62 min
Jul 24, 3:19 PM MDTSpecial Weather StatementRIWJohnson41 min
Jul 24, 4:06 PM MDTSpecial Weather StatementRIWJohnson54 min
Jul 24, 5:01 PM MDTSpecial Weather StatementRIWNatrona59 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2008Every severe thunderstorm warning in 2008

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.