Alert archive / Iowa / Tornado Warnings in 1990

Tornado Warning 42, NWS Des Moines, IA

June 30, 1990Adams County, Union County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 30, 1990, 5:03 PM CDT for Adams County, Union County, Iowa. It was in force for 27 min.

The area

The counties it named.

The facts

Issued
Jun 30, 1990, 5:03 PM CDT (22:03 UTC)
Expired
Jun 30, 1990, 5:30 PM CDT
In force
27 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Adams County, IA, Union 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 12:00Z, 10.1 hours before the alert went out and 162 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 1990-06-30Temperature 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 12:00Z on 1990-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
3663 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
37 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 302203
TORDSM
IAC003-175-302230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE DES MOINES IA
503 PM CDT SAT JUN 30 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 530 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE SOUTHWEST PART OF IOWA
      EASTERN ADAMS...

   IN THE SOUTH CENTRAL PART OF IOWA
      WESTERN UNION...

AT 458 PM...THE UNION COUNTY SHERIFF SIGHTED A FUNNEL CLOUD IN
THE VICINITY OF CRESTON.  NATIONAL WEATHER SERVICE RADAR
INDICATED AN INTENSE THUNDERSTORM IN WESTERN UNION COUNTY
...BUILDING BACK TOWARD EASTERN ADAMS COUNTY.

THIS STORM WAS LOCATED ABOUT 50 MILES SOUTHWEST OF DES MOINES
...AND WAS SOUTH ABOUT 25 MILES AN HOUR.

THIS WARNING INCLUDES THE CITY OF CRESTON...AS WELL AS CROMWELL
...AND KENT.

IF YOU ARE IN THE PATH OF THIS TORNADO...THE SAFEST PLACE IS IN A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.  IF
NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM ON THE
LOWEST FLOOR.  IF YOU ARE IN A VEHICLE OR MOBILE HOME...LEAVE IT AT
ONCE AND TAKE SHELTER IN A REINFORCED BUILDING OR IN A DITCH.

DOWD/TRUETT/HUTTON

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 7:44 PM CDTTornado WarningDMXWright40 min
Jun 30, 8:24 AM CDTSevere Thunderstorm WarningDMXVan Buren36 min
Jun 30, 9:39 AM CDTSevere Thunderstorm WarningDMXVan Buren36 min
Jun 30, 10:20 AM CDTSevere Thunderstorm WarningDMXVan Buren25 min
Jun 30, 1:05 PM CDTFlash Flood WarningDMXDavis, Van Buren4 hr
Jun 30, 1:30 PM CDTSevere Thunderstorm WarningDMXDavis, Van Buren45 min
Jun 30, 2:53 PM CDTSevere Thunderstorm WarningDMXWarren37 min
Jun 30, 3:08 PM CDTSevere Thunderstorm WarningDMXMadison37 min
Jun 30, 3:23 PM CDTSevere Thunderstorm WarningDMXClarke, Lucas37 min
Jun 30, 3:30 PM CDTSevere Thunderstorm WarningDMXWarren30 min
Jun 30, 3:42 PM CDTTornado WarningDMXMadison, Warren33 min
Jun 30, 4:01 PM CDTSevere Thunderstorm WarningDMXClarke, Union44 min
Jun 30, 4:19 PM CDTSevere Thunderstorm WarningDMXDecatur, Wayne41 min
Jun 30, 4:36 PM CDTSevere Thunderstorm WarningDMXDecatur54 min
Jun 30, 4:39 PM CDTSevere Thunderstorm WarningDMXMahaska51 min
Jun 30, 4:42 PM CDTSevere Thunderstorm WarningDMXRinggold, Union48 min
Jun 30, 4:57 PM CDTTornado WarningDMXDecatur33 min
Jun 30, 5:00 PM CDTFlash Flood WarningDMXMahaska4 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.