Alert archive / Iowa / Flash Flood Warnings in 1991

Flash Flood Warning 14, NWS Des Moines, IA

June 14, 1991Cass County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jun 14, 1991, 4:02 AM CDT for Cass County, Iowa. It was in force for 118 min.

The area

The counties it named.

The facts

Issued
Jun 14, 1991, 4:02 AM CDT (09:02 UTC)
Expired
Jun 14, 1991, 6:00 AM CDT
In force
118 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Cass County, IA

The nearest sounding before it

Omaha, NE (KOVN), launched 00:00Z, 9.0 hours before the alert went out and 120 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 1991-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1980 joules per kilogram.LCLEL10008507005003002001001 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 1991-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 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
1980 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1429 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
309 m²/s²
Significant tornado parameter
0.8
Supercell composite
9.6

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 14, 1:09 AM CDTSevere Thunderstorm WarningDMXCass51 min
Jun 14, 1:20 AM CDTSevere Thunderstorm WarningDMXGuthrie40 min
Jun 14, 4:49 PM CDTSevere Thunderstorm WarningDMXFayette41 min
Jun 14, 5:12 PM CDTSevere Thunderstorm WarningDMXAllamakee33 min

Nearby

Flash Flood Warnings in Iowa, 1991Every flash flood warning 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.