Alert archive / Iowa / Tornado Warnings in 1990

Tornado Warning 33, NWS Des Moines, IA

June 19, 1990Decatur County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 19, 1990, 10:23 PM CDT for Decatur County, Iowa. It was in force for 37 min.

The area

The counties it named.

The facts

Issued
Jun 19, 1990, 10:23 PM CDT (03:23 UTC)
Expired
Jun 19, 1990, 11:00 PM CDT
In force
37 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Decatur County, IA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.4 hours before the alert went out and 226 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 1990-06-20Temperature 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, Omaha, NE at 00:00Z on 1990-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -66 square meters per square second.1939587897117Sfc1 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
3628 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
-66 m²/s²
0-3 km storm-relative helicity
74 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 200333
TORDSM
IAC053-200400-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1023 PM CDT TUE JUN 19 1990
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL 1100 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH CENTRAL IOWA
          ...DECATUR
 
AT 1030 PM RADAR INDICATED A POSSIBLE TORNADO OVER DECATUR COUNTY...OR
ABOUT 55 MILES SOUTH OF DES MOINES. THE STORM IS MOVING EAST AT 25 TO
30 MILES AN HOUR.
 
SOME TOWNS AFFECTED BY THIS STORM INCLUDE GRAND RIVER...VAN
WERT...DECATUR CITY...LEON AND GARDEN GROVE.
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE COF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
MARTIN/ELLIS/FORSTER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 7:04 PM CDTFlash Flood WarningDMXMarion, Warren5 hr
Jun 19, 7:04 PM CDTFlash Flood WarningDMXMadison5 hr
Jun 19, 8:05 PM CDTFlash Flood WarningDMXKeokuk, Mahaska4 hr
Jun 19, 8:05 PM CDTFlash Flood WarningDMXWashington4 hr
Jun 19, 8:11 PM CDTSevere Thunderstorm WarningDMXJones49 min
Jun 19, 8:11 PM CDTSevere Thunderstorm WarningDMXMahaska49 min
Jun 19, 8:38 PM CDTFlash Flood WarningDMXAppanoose, Davis, Monroe, Wapello7 hr
Jun 19, 8:38 PM CDTFlash Flood WarningDMXJefferson, Van Buren7 hr
Jun 19, 8:45 PM CDTTornado WarningDMXMarion30 min
Jun 19, 8:48 PM CDTSevere Thunderstorm WarningDMXWinneshiek42 min
Jun 19, 9:00 PM CDTSevere Thunderstorm WarningDMXClarke, Union45 min
Jun 19, 9:12 PM CDTSevere Thunderstorm WarningDMXDecatur, Ringgold48 min
Jun 19, 9:13 PM CDTSevere Thunderstorm WarningDMXKeokuk, Mahaska62 min
Jun 19, 9:15 PM CDTSevere Thunderstorm WarningDMXAllamakee30 min
Jun 19, 9:19 PM CDTFlash Flood WarningDMXClarke, Decatur, Lucas, Wayne5 hr
Jun 19, 9:19 PM CDTFlash Flood WarningDMXRinggold, Union5 hr
Jun 19, 9:42 PM CDTTornado WarningDMXDecatur, Ringgold48 min
Jun 19, 10:14 PM CDTSevere Thunderstorm WarningDMXWarren46 min
Jun 19, 10:52 PM CDTSevere Thunderstorm WarningDMXWayne33 min
Jun 19, 11:31 PM CDTSevere Thunderstorm WarningDMXAppanoose29 min
Jun 19, 11:55 PM CDTFlash Flood WarningDMXKeokuk, Washington6 hr
Jun 19, 11:55 PM CDTFlash Flood WarningDMXMahaska6 hr
Jun 19, 11:55 PM CDTFlash Flood WarningDMXMarion4 hr

Nearby

Tornado Warnings in Iowa, 1990Every tornado warning in 1990Tornadoes in 1990

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.