Alert archive / Iowa / Tornado Warnings in 1990

Tornado Warning 8, NWS Des Moines, IA

June 1, 1990Pocahontas County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 1, 1990, 11:46 PM CDT for Pocahontas County, Iowa. It was in force for 9 min.

The area

The counties it named.

The facts

Issued
Jun 1, 1990, 11:46 PM CDT (04:46 UTC)
Expired
Jun 1, 1990, 11:55 PM CDT
In force
9 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Pocahontas 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, 4.8 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 00:00Z on 1990-06-02Temperature 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 1990-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 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
3589 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
241 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 020446
TORDSM
IAC151-020515-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1146 PM CDT FRI JUN 1 1990
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL 1215 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN NORTHWEST IOWA
          ...POCOHONTAS
 
AT 1145 PM...WEATHER RADAR IN DES MOINES INDICATED A POSSIBLE TORNADO
ABOUT 5 MILES SOUTHWEST OF POCAHONTAS...OR ABOUT 30 MILES NORTHWEST OF
FORT DODGE.
 
THE STORM CONTINUED MOVING NORTHEAST AT 45 MILES AN HOUR...AND WILL BE
AFFECTING THE CITIES OF POCAHONTAS AND ROLFE.
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF 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.
 
BARLOW/GOODSON/TRUETT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 11:29 PM CDTSevere Thunderstorm WarningDMXPocahontas46 min
Jun 2, 11:49 AM CDTTornado WarningDMXJefferson26 min

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.