Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 121, NWS Des Moines, IA

June 30, 1994Winnebago County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 30, 1994, 10:57 PM CDT for Winnebago County, Iowa. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Jun 30, 1994, 10:57 PM CDT (03:57 UTC)
Expired
Jun 30, 1994, 11:45 PM CDT
In force
48 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Winnebago County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 4.0 hours before the alert went out and 164 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, Minneapolis, MN at 00:00Z on 1994-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2237 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, Minneapolis, MN at 00:00Z on 1994-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 266 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
2237 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
1140 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
266 m²/s²
0-3 km storm-relative helicity
383 m²/s²
Significant tornado parameter
4.4
Supercell composite
12.4

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 Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 30, 10:23 PM CDTSevere Thunderstorm WarningDMXDickinson52 min
Jun 30, 10:57 PM CDTSevere Thunderstorm WarningDMXWorth29 min
Jun 30, 11:03 PM CDTSevere Thunderstorm WarningDMXClay42 min
Jul 1, 5:47 PM CDTSevere Thunderstorm WarningDMXAudubon, Cass28 min
Jul 1, 5:55 PM CDTSevere Thunderstorm WarningDMXCass35 min
Jul 1, 6:17 PM CDTSevere Thunderstorm WarningDMXAdair28 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1994Every severe thunderstorm warning in 1994

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.