Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 123, NWS Des Moines, IA

June 30, 1994Clay County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 30, 1994, 11:03 PM CDT for Clay County, Iowa. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
Jun 30, 1994, 11:03 PM CDT (04:03 UTC)
Expired
Jun 30, 1994, 11:45 PM CDT
In force
42 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Clay County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.1 hours before the alert went out and 220 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, Omaha, NE at 00:00Z on 1994-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2247 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, Omaha, NE at 00:00Z on 1994-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.1939Sfc1 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
2247 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
1586 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
193 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.6

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 WarningDMXWinnebago48 min
Jun 30, 10:57 PM CDTSevere Thunderstorm WarningDMXWorth29 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.