Alert archive / Iowa / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 44, NWS Des Moines, IA

June 7, 1993Johnson County, Washington County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 7, 1993, 9:18 PM CDT for Johnson County, Washington County, Iowa. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
Jun 7, 1993, 9:18 PM CDT (02:18 UTC)
Expired
Jun 7, 1993, 10:00 PM CDT
In force
42 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Johnson County, IA, Washington County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.3 hours before the alert went out and 394 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 1993-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 378 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, Omaha, NE at 00:00Z on 1993-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.1939587897117Sfc1 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
378 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
1627 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
192 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

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, Jun 7, 7:58 PM CDT, 1 hour 20 minutes before
IAZALL-080140-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
758 PM CDT MON JUN 7 1993

...A TORNADO WATCH IS IN EFFECT FOR THE EASTERN TWO-THIRDS OF IOWA
   UNTIL 2AM...
...A FLASH FLOOD WATCH IS IN EFFECT FOR ALL BUT EXTREME NORTHWEST
    IOWA TONIGHT...

AT 730 PM CDT...AN AREA OF SHOWERS AND STRONG THUNDERSTORMS CONTINUED
OVER ABOUT THE SOUTHEASTERN HALF OF IOWA. THE SHOWERS AND STORMS
WERE GENERALLY SOUTH AND EAST OF A LINE FROM LAMONI TO WATERLOO TO
DECORAH. THE STRONGEST STORMS WERE LOCATED OVER SOUTH CENTRAL AND
SOUTHEASTERN IOWA IN MONROE AND APPANOOSE COUNTIES BETWEEN ALBIA AND
CENTERVILLE. DANGEROUS LIGHTNING...GUSTY WINDS AND HAIL ARE POSSIBLE
WITH THESE STORMS. OTHER STRONG STORMS WERE LOCATED IN EAST CENTRAL IOWA
NEAR CEDAR RAPIDS.

ANOTHER AREA OF STRONG THUNDERSTORMS WAS LOCATED IN NORTHWESTERN IOWA
ABOUT 10 MILES WEST OF SPENCER. THESE STORMS ARE ALSO CAPABLE OF
PRODUCING STRONG WINDS...DANGEROUS LIGHTNING AND HAIL.

MOVEMENT OF ALL THE SHOWERS AND THUNDERSTORMS WAS TO THE NORTHEAST AT
35 MILES AN HOUR.

PETERSEN/MARTIN
Special weather statement, Jun 7, 7:59 PM CDT, 1 hour 19 minutes before
IAZALL-080140-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
758 PM CDT MON JUN 7 1993

...A TORNADO WATCH IS IN EFFECT FOR THE EASTERN TWO-THIRDS OF IOWA
   UNTIL 2AM...
...A FLASH FLOOD WATCH IS IN EFFECT FOR ALL BUT EXTREME NORTHWEST
    IOWA TONIGHT...

AT 730 PM CDT...AN AREA OF SHOWERS AND STRONG THUNDERSTORMS CONTINUED
OVER ABOUT THE SOUTHEASTERN HALF OF IOWA. THE SHOWERS AND STORMS
WERE GENERALLY SOUTH AND EAST OF A LINE FROM LAMONI TO WATERLOO TO
DECORAH. THE STRONGEST STORMS WERE LOCATED OVER SOUTH CENTRAL AND
SOUTHEASTERN IOWA IN MONROE AND APPANOOSE COUNTIES BETWEEN ALBIA AND
CENTERVILLE. DANGEROUS LIGHTNING...GUSTY WINDS AND HAIL ARE POSSIBLE
WITH THESE STORMS. OTHER STRONG STORMS WERE LOCATED IN EAST CENTRAL IOWA
NEAR CEDAR RAPIDS.

ANOTHER AREA OF STRONG THUNDERSTORMS WAS LOCATED IN NORTHWESTERN IOWA
ABOUT 10 MILES WEST OF SPENCER. THESE STORMS ARE ALSO CAPABLE OF
PRODUCING STRONG WINDS...DANGEROUS LIGHTNING AND HAIL.

MOVEMENT OF ALL THE SHOWERS AND THUNDERSTORMS WAS TO THE NORTHEAST AT
35 MILES AN HOUR.

PETERSEN/MARTIN
Special weather statement, Jun 7, 8:51 PM CDT, 27 minutes before
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Special weather statement, Jun 7, 8:52 PM CDT, 26 minutes before
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Special weather statement, Jun 7, 9:00 PM CDT, 18 minutes before
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Special weather statement, Jun 7, 9:04 PM CDT, 14 minutes before
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 7:03 PM CDTSevere Thunderstorm WarningDMXAppanoose27 min
Jun 7, 7:14 PM CDTTornado WarningDMXDickinson26 min
Jun 7, 7:47 PM CDTSevere Thunderstorm WarningDMXWapello43 min
Jun 7, 8:09 PM CDTFlash Flood WarningDMXAppanoose, Monroe, Wayne3 hr
Jun 7, 8:09 PM CDTFlash Flood WarningDMXWapello3 hr
Jun 7, 8:37 PM CDTFlash Flood WarningDMXKeokuk2 hr
Jun 7, 8:45 PM CDTSevere Thunderstorm WarningDMXAppanoose, Davis25 min
Jun 7, 9:02 PM CDTFlash Flood WarningDMXDavis118 min
Jun 7, 10:53 PM CDTFlash Flood WarningDMXAppanoose, Davis97 min
Jun 8, 11:31 AM CDTSevere Thunderstorm WarningDMXWinneshiek29 min
Jun 8, 11:52 AM CDTTornado WarningDMXWinneshiek38 min
Jun 8, 12:16 PM CDTSevere Thunderstorm WarningDMXAllamakee44 min
Jun 8, 1:11 PM CDTTornado WarningDMXWorth49 min
Jun 8, 1:16 PM CDTSevere Thunderstorm WarningDMXMitchell42 min
Jun 8, 1:45 PM CDTSevere Thunderstorm WarningDMXHoward, Winneshiek26 min
Jun 8, 1:48 PM CDTTornado WarningDMXWright27 min
Jun 8, 6:01 PM CDTTornado WarningDMXWashington29 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1993Every severe thunderstorm warning in 1993

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.