Alert archive / Wyoming / Tornado Warnings in 1991

Tornado Warning 13, NWS Rapid City, SD

June 21, 1991Natrona County, Wyoming

NWS Rapid City, SD issued this tornado warning at Jun 21, 1991, 2:47 PM MDT for Natrona County, Wyoming. It was in force for 43 min.

The area

The counties it named.

The facts

Issued
Jun 21, 1991, 2:47 PM MDT (20:47 UTC)
Expired
Jun 21, 1991, 3:30 PM MDT
In force
43 min
Issued by
NWS Rapid City, SD
Area
Whole counties

County Natrona County, WY

The nearest sounding before it

Lander/Hunt Fiel, WY (KLND), launched 12:00Z, 8.8 hours before the alert went out and 156 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, Lander/Hunt Fiel, WY at 12:00Z on 1991-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 324 joules per kilogram.LCLLFCEL10008507005003002001001 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, Lander/Hunt Fiel, WY at 12:00Z on 1991-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
324 J/kg
Mixed-layer CIN
-214 J/kg
Mixed-layer LCL
908 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 8:04 PM MDTSevere Thunderstorm WarningUNRConverse41 min
Jun 20, 8:48 PM MDTSevere Thunderstorm WarningUNRConverse42 min

Nearby

Tornado Warnings in Wyoming, 1991Every tornado warning in 1991Tornadoes in 1991

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.