Alert archive / Iowa / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 88, NWS Des Moines, IA

August 25, 1992Black Hawk County, Buchanan County, Fayette County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 25, 1992, 1:37 PM CDT for Black Hawk County, Buchanan County, Fayette County, Iowa. It was in force for 53 min.

The area

The counties it named.

The facts

Issued
Aug 25, 1992, 1:37 PM CDT (18:37 UTC)
Expired
Aug 25, 1992, 2:30 PM CDT
In force
53 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Black Hawk County, IA, Buchanan County, IA, Fayette County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 6.6 hours before the alert went out and 281 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 12:00Z on 1992-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 1992-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -33 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
611 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
-33 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 25, 1:17 PM CDT, 20 minutes before
IAZ006>011-016>019-026>029-038>040-251910-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
115 PM CDT TUE AUG 25 1992

...ISOLATED STRONG THUNDERSTORM ALONG HIGHWAY 20 NEAR WATERLOO...

AT 110 PM CDT AN ISOLATED STRONG THUNDERSTORM HAD DEVELOPED SOUTHWEST
OF WATERLOO NEAR THE TOWN OF HUDSON.  THIS STORM WAS PRODUCING HEAVY
RAINS AND SOME PEA SIZE HAIL.  THIS STORM WAS MOVING NORTHEAST AT 30
MILES AN HOUR.  THIS STORM WILL AFFECT THED TOWNS OF WAVERLY...DENVER
AND DUNKERTON THROUGH 2 PM.

TRS

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 25, 2:36 PM CDTSevere Thunderstorm WarningDMXTama44 min
Aug 25, 3:23 PM CDTSevere Thunderstorm WarningDMXBlack Hawk52 min
Aug 25, 5:16 PM CDTSevere Thunderstorm WarningDMXJefferson29 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1992Every severe thunderstorm warning in 1992

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.