Alert archive / Iowa / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 21, NWS Des Moines, IA

April 26, 1989Black Hawk County, Buchanan County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 26, 1989, 2:54 PM CDT for Black Hawk County, Buchanan County, Iowa. It was in force for 51 min. 2 reports 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 26, 1989, 2:54 PM CDT (19:54 UTC)
Expired
Apr 26, 1989, 3:45 PM CDT
In force
51 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Black Hawk County, IA, Buchanan 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

TimeReportWhereRemark
Apr 26, 3:00 PM CDTThunderstorm Wind 50Black Hawk, IA
Apr 26, 3:14 PM CDTTornado F1Buchanan, 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

Peoria Regional, IL (KPIA), launched 12:00Z, 7.9 hours before the alert went out and 287 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, Peoria Regional, IL at 12:00Z on 1989-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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, Peoria Regional, IL at 12:00Z on 1989-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
2 J/kg
Mixed-layer CIN
-675 J/kg
Mixed-layer LCL
1295 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
54 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 261954
SVRALO
IAC013-019-262045-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE WATERLOO IA
254 PM CDT WED APR 26 1989

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 345 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE NORTHEAST PART OF IOWA
      BLACK HAWK...BUCHANAN

AT 241 PM CDT A SEVERE THUNDERSTORM WAS AT THE WATERLOO AIRPORT
MOVING EAST AT 50 MILES AN HOUR.  THIS STORM HAS PRODUCED WINDS
OF 58 MPH AT THE WATERLOO AIRPORT.

SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 11:19 AM CDTSevere Thunderstorm WarningDMXDickinson, Emmet41 min
Apr 26, 12:06 PM CDTSevere Thunderstorm WarningDMXEmmet, Kossuth54 min
Apr 26, 12:32 PM CDTSevere Thunderstorm WarningDMXKossuth28 min
Apr 26, 1:05 PM CDTSevere Thunderstorm WarningDMXHancock40 min
Apr 26, 2:51 PM CDTSevere Thunderstorm WarningDMXBoone39 min
Apr 26, 3:15 PM CDTTornado WarningDMXBoone30 min
Apr 26, 3:46 PM CDTTornado WarningDMXBoone, Story44 min
Apr 26, 4:06 PM CDTSevere Thunderstorm WarningDMXBenton, Linn39 min
Apr 26, 4:15 PM CDTTornado WarningDMXPolk45 min
Apr 26, 4:45 PM CDTSevere Thunderstorm WarningDMXJohnson, Linn45 min
Apr 26, 4:45 PM CDTSevere Thunderstorm WarningDMXAudubon, Guthrie45 min
Apr 26, 4:54 PM CDTTornado WarningDMXJasper, Polk51 min
Apr 26, 5:20 PM CDTSevere Thunderstorm WarningDMXJasper, Marion, Polk55 min
Apr 26, 5:32 PM CDTSevere Thunderstorm WarningDMXCarroll, Greene, Guthrie43 min
Apr 26, 6:10 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion50 min
Apr 26, 6:23 PM CDTSevere Thunderstorm WarningDMXDallas, Guthrie67 min
Apr 26, 6:53 PM CDTSevere Thunderstorm WarningDMXJefferson, Wapello67 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1989Every severe thunderstorm warning in 1989

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.