Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 27, NWS Des Moines, IA

April 23, 1990Winnebago County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 23, 1990, 1:39 PM CDT for Winnebago County, Iowa. It was in force for 66 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 23, 1990, 1:39 PM CDT (18:39 UTC)
Expired: Apr 23, 1990, 2:45 PM CDT
In force: 66 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Winnebago County, IA

The radar

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

What was reported inside it

Time	Report	Where	Remark
Apr 23, 1:53 PM CDT	Thunderstorm Wind 50	Winnebago, IA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 6.7 hours before the alert went out and 164 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 114 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 1060 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 83 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 231839
SVRALO
IAC189-231945-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE WATERLOO IA
139 PM CDT MON APR 23 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 245 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY

   IN THE NORTH CENTRAL PART OF IOWA
      WINNEBAGO

AT 133 PM CDT WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM 25 MILES NORTHWEST OF MASON CITY SOUTH OF THE TOWN
OF THOMPSON IOWA.  AT 130 PM CDT A SHERIFFS DEPUTY REPORTED
HIGH WINDS AND AN SOLID OUTBUILDING DOWN.  THIS SEVERE STORM IS
MOVING NORTHEAST AT 30 MPH.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A REINFORCED BUILDING.
DO NOT SEEK SHELTER UNDER TREES.  DAMAGING WINDS...LARGE HAIL...
VERY HEAVY RAIN...AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE
THUNDERSTORMS.

 THIS IS A DANGEROUS STORM TAKE COVER IMMEDIATELY.

Nearby

Severe Thunderstorm Warnings in Iowa, 1990 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.