Alert archive / Iowa / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 239, NWS Des Moines, IA

September 2, 1993Decatur County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Sep 2, 1993, 2:52 PM CDT for Decatur County, Iowa. It was in force for 25 min.

The area

The counties it named.

The facts

Issued
Sep 2, 1993, 2:52 PM CDT (19:52 UTC)
Expired
Sep 2, 1993, 3:17 PM CDT
In force
25 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Decatur County, IA

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 7.9 hours before the alert went out and 250 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, Topeka, KS at 12:00Z on 1993-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 943 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, Topeka, KS at 12:00Z on 1993-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 129 square meters per square second.19395878Sfc1 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
943 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
762 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
129 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

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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 Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 2, 1:06 PM CDTSevere Thunderstorm WarningDMXRinggold54 min
Sep 2, 1:06 PM CDTSevere Thunderstorm WarningDMXTaylor42 min
Sep 2, 2:04 PM CDTSevere Thunderstorm WarningDMXRinggold31 min
Sep 2, 2:04 PM CDTSevere Thunderstorm WarningDMXDecatur41 min
Sep 2, 2:52 PM CDTSevere Thunderstorm WarningDMXWayne38 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1993Every severe thunderstorm warning in 1993

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.