Alert archive / Iowa / Tornado Warnings in 1992

Tornado Warning 3, NWS Des Moines, IA

April 15, 1992Pocahontas County, Iowa

NWS Des Moines, IA issued this tornado warning at Apr 15, 1992, 4:00 PM CDT for Pocahontas County, Iowa. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
Apr 15, 1992, 4:00 PM CDT (21:00 UTC)
Expired
Apr 15, 1992, 4:30 PM CDT
In force
30 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Pocahontas County, IA

The nearest sounding before it

Omaha, NE (KOVN), launched 12:00Z, 9.0 hours before the alert went out and 210 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 12:00Z on 1992-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 186 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 12:00Z on 1992-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
186 J/kg
Mixed-layer CIN
-210 J/kg
Mixed-layer LCL
1464 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
66 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 KDSM 152101
TORDSM
IAC151-152130-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
400 PM CDT WED APR 15 1992
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  430 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHWEST IOWA
 
   ...EASTERN POCAHONTAS COUNTY
 
AT 357 PM POCAHONTAS SHERIFFS SPOTTED A TORNADO 5 MILES EAST OF
POCAHONTAS OR ABOUT 25 MILES NORTHWEST OF FORT DODNGE.
 
THE TORNADO WAS MOVING NORTHEAST AT 25 MILES AN HOUR.  PEOPLE IN THE
COMMUNITIES OF ROLFE...GILMORE CITY AND RURAL AREAS SHOULD BE PREPARED
TO TAKE COVER IN A BASEMENT OR INTERIOR HALLWAY.
 
MYERS

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, 4:15 PM CDTSevere Thunderstorm WarningDMXLinn41 min
Apr 15, 4:29 PM CDTTornado WarningDMXHumboldt25 min
Apr 15, 4:53 PM CDTSevere Thunderstorm WarningDMXHancock22 min
Apr 15, 6:02 PM CDTSevere Thunderstorm WarningDMXGrundy28 min

Nearby

Tornado Warnings in Iowa, 1992Every tornado warning in 1992Tornadoes 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.