Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 160, NWS Des Moines, IA

August 9, 1990Hardin County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 9, 1990, 10:11 PM CDT for Hardin County, Iowa. It was in force for 34 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
Aug 9, 1990, 10:11 PM CDT (03:11 UTC)
Expired
Aug 9, 1990, 10:45 PM CDT
In force
34 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Hardin 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
Aug 9, 10:30 PM CDTThunderstorm Wind 50Hardin, 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 00:00Z, 3.2 hours before the alert went out and 276 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, Minneapolis, MN at 00:00Z on 1990-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 230 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, Minneapolis, MN at 00:00Z on 1990-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.19395878Sfc1 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
230 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1690 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 9, 9:15 PM CDT, 56 minutes before
IAZ002-003-007-080300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
910 PM CDT THU AUG 8 1990

AT 905 PM CDT SHOWERS AND THUNDERSTORMS WERE OCCURRING IN A 25 MILE
WIDE BAND FROM 5 MILES NORTH OF HAMPTON TO DECORAH. THE STRONGEST
STORMS WERE IN SOUTHEAST CERRO GORDO COUNTY NEAR THE TOWN OF DOUGHERTY
AND SOUTHERN FLOYD COUNTY BETWEEN MARBLE ROCK AND CHARLES CITY. THESE
STORMS WILL PRODUCE HEAVY RAINS...DEADLY LIGHTNING...AND SOME SMALL
HAIL. THESE STORMS WERE MOVING TO THE SOUTH AT 20 MILES AN HOUR.

THESE STORMS WILL CONTINUE TO MOVE SOUTH INTO FRANKLIN AND BUTLER
COUNTIES AND AFFECT THE CITIES OF HAMPTON...SHEFFIELD...CLARKSVILLE
AND GREENE.

PEOPLE SHOULD BE ALERT FOR TMHREATENING WEATHER AND MOVE TO A PLACE
OF SAFETY IF IN THE PATH OF THESE STORMS.

COLLAR
Special weather statement, Aug 9, 10:06 PM CDT, 5 minutes before
IAZ002-003-007-100400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
1005 PM CDT THU AUG 9 1990

AT 955 PM CDT SHOWERS AND THUNDERSTORMS WERE OCCURRING IN A 25 MILE
WIDE BAND FROM 5 MILES NORTH OF GRUNDY CENTER THROUGH NEW HARTFORD TO
10 MILES NORTHEAST OF WAVERLY. THESE STORMS WILL PRODUCE HEAVY RAINS
...DEADLY LIGHTNING...AND POSSIBLY SOME SMALL HAIL. THE STORMS WERE
MOVING TO THE SOUTH AT 20 TO 25 MILES AN HOUR.

THESE STORMS WILL CONTINUE TO MOVE THROUGH GRUNDY AND BLACK HAWK COUNTY
AND AFFECT THE CITIES OF WATERLOO...CEDAR FALLS..AND THE GRUNDY CENTER
AREA BETWEEN 1000 AND 1100 PM CDT.

PEOPLE SHOULD BE ALERT FOR THREATENING WEATHER AND MOVE TO A PLACE
OF SAFETY IF IN THE PATH OF THESE STORMS.

COLLAR

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 11:44 PM CDTSevere Thunderstorm WarningDMXStory31 min
Aug 10, 12:49 AM CDTSevere Thunderstorm WarningDMXBoone34 min
Aug 10, 12:49 AM CDTSevere Thunderstorm WarningDMXDallas41 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1990Every 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.