Alert archive / Iowa / Flash Flood Warnings in 1991

Flash Flood Warning 7, NWS Des Moines, IA

June 1, 1991Cass County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jun 1, 1991, 5:20 PM CDT for Cass County, Iowa. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jun 1, 1991, 5:20 PM CDT (22:20 UTC)
Expired
Jun 1, 1991, 8:15 PM CDT
In force
3 hr
Issued by
NWS Des Moines, IA
Area
Whole counties

County Cass County, IA

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 10.3 hours before the alert went out and 266 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 1991-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3284 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 1991-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 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
3284 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
661 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.5

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 1, 2:21 AM CDTSevere Thunderstorm WarningDMXDallas, Madison16 hr
Jun 1, 4:50 PM CDTFlash Flood WarningDMXDallas3 hr

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.