Alert archive / Iowa / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 21, NWS Des Moines, IA

April 15, 1992Hancock County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 15, 1992, 4:53 PM CDT for Hancock County, Iowa. It was in force for 22 min.

The area

The counties it named.

The facts

Issued
Apr 15, 1992, 4:53 PM CDT (21:53 UTC)
Expired
Apr 15, 1992, 5:15 PM CDT
In force
22 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Hancock County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 9.9 hours before the alert went out and 197 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 1992-04-15Temperature 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 1992-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
536 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-18 m²/s²
0-3 km storm-relative helicity
101 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KALO 152154
SVRALO
IAC081-152245-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WATERLOO IA
453 PM CDT WED APR 15 1992
 
THE NATIONAL WEATHER SERVICE IN WATERLOO HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  545 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTH CENTRAL IOWA
 
   ...HANCOCK COUNTY
 
AT 455 PM CDT WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM 30
MILES SOUTHWEST OF MASON CITY NEAR THE TOWN OF KANAWHA.
 
THE STORM WAS MOVING NORTHEAST AT 35 TO 40 MPH AND WILL BE AFFECTING THE
TOWNS OF CORWITH...BRITT...DUNCAN AND GARNER.
 
 
 
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A REINFORCED BUILDING.
STAY INSIDE AWAYZ FROM WINDOWS UNTIL THE STORM HAS PASSED.
DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
 
GOODSON/COLLAR

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 1:26 AM CDTSevere Thunderstorm WarningDMXChickasaw34 min
Apr 15, 1:35 PM CDTSevere Thunderstorm WarningDMXWarren25 min
Apr 15, 1:50 PM CDTSevere Thunderstorm WarningDMXPolk25 min
Apr 15, 4:00 PM CDTTornado WarningDMXPocahontas30 min
Apr 15, 4:15 PM CDTSevere Thunderstorm WarningDMXLinn41 min
Apr 15, 4:29 PM CDTTornado WarningDMXHumboldt25 min
Apr 15, 6:02 PM CDTSevere Thunderstorm WarningDMXGrundy28 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.