Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 70, NWS Des Moines, IA

June 7, 1994Johnson County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 7, 1994, 5:20 PM CDT for Johnson County, Iowa. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
Jun 7, 1994, 5:20 PM CDT (22:20 UTC)
Expired
Jun 7, 1994, 5:50 PM CDT
In force
30 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Johnson County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 10.3 hours before the alert went out and 389 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 12:00Z on 1994-06-07Temperature 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, Minneapolis, MN at 12:00Z on 1994-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
725 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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

Local storm report, Jun 7, 3:18 PM CDT, 2 hours 2 minutes before
LOCAL STORM REPORT...ADDITIONAL
NATIONAL WEATHER SERVICE DES MOINES IA
318 PM CDT TUE JUN 7 1994

   ....SEVERE WEATHER ON  6/6/94....

700 PM CDT... MAJOR CROP DAMAGE IN AND AROUND THE CALLENDER AREA IN
             WEBSTER COUNTY DUE TO HAIL.  MOST OF HAIL WAS PEA TO
             MARBLE SIZE.

845 PM CDT...NUMEROUS POWER LINES AND LARGE TREES DOWNED IN THE
             NEW PROVIDENCE AREA.  /SOUTHERN HARDIN COUNTY/

JM
Local storm report, Jun 7, 3:19 PM CDT, 2 hours 1 minute before
LOCAL STORM REPORT...ADDITIONAL
NATIONAL WEATHER SERVICE DES MOINES IA
318 PM CDT TUE JUN 7 1994

   ....SEVERE WEATHER ON  6/6/94....

700 PM CDT... MAJOR CROP DAMAGE IN AND AROUND THE CALLENDER AREA IN
             WEBSTER COUNTY DUE TO HAIL.  MOST OF HAIL WAS PEA TO
             MARBLE SIZE.

845 PM CDT...NUMEROUS POWER LINES AND LARGE TREES DOWNED IN THE
             NEW PROVIDENCE AREA.  /SOUTHERN HARDIN COUNTY/

JM
Special weather statement, Jun 7, 3:40 PM CDT, 1 hour 40 minutes before
IAZALL-072140-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IOWA
340 PM CDT TUE JUN 7 1994

...A FLASH FLOOD WATCH IS IN EFFECT OVER SOUTHWEST IOWA FOR THE REST OF
THIS AFTERNOON AND TONIGHT...

AT 326 PM...SCATTERED SHOWERS AND THUNDERSTORMS WERE OCCURRING ACROSS
THE CENTRAL THIRD OF THE STATE AND IN THE SOUTHERN TIER OF IOWA
COUNTIES.  THE STRONGEST OF THESE STORMS WAS LOCATED IN A 20 MILE WIDE
BAND FROM TAMA TO 15 MILES WEST OF CEDAR RAPIDS.

THE REMAINDER OF THE SHOWERS WERE LOCATED SOUTH OF A LINE FROM SIOUX
CITY TO NEWTON.

THE THUNDERSTORMS HAVE BEEN PRODUCING PEA SIZE HAIL AND HEAVY RAINFALLS
OF OVER ONE INCH IN THE TAMA/TOLEDO AREA.

SCHAFER/RUNYAN
Special weather statement, Jun 7, 4:40 PM CDT, 40 minutes before
IAZALL-072240-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IOWA
440 PM CDT TUE JUN 7 1994

...A FLASH FLOOD WATCH IS IN EFFECT OVER SOUTHWEST IOWA FOR THE REST OF
THIS AFTERNOON AND TONIGHT...

AT 430 PM...AN INTENSE THUNDERSTORM WITH VERY HEAVY RAINS AND SMALL HAIL
WAS LOCATED IN EAST CENTRAL IOWA JUST NORTHWEST OF CEDAR RAPIDS.  OTHER
THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED IN WEST CENTRAL AND
NORTHWEST IOWA IN AN AREA AOUT 20 MILES WIDE AND EXTENDING FROM JUST
SOUTH OF SIOUX CITY TO JUST WEST OF BOONE.

THE THUNDERSTORMS WERE MOVING TO THE EAST AT 25 MILES AN HORL.

SCOTT

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Local storm report, Jun 7, 5:17 PM CDT, 3 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
520 PM CDT TUE JUN 7 1994

...ALL TIMES CDT...

    TIME                  EVENT              LOCATION -CITY AND COUNTY

 505 PM         1 INCH DIAMETER HAIL        FAIRFAX IN BENTON CO.

 510 PM         1.5 INCH DIMATER HAIL       LAWFORD IN BENTON CO.

 515 PM         0.75 INCH DIAMETER HAIL     4 WEST OF SWISHER IN
                                            JOHNSON COUNTY.

ANDERSON
Local storm report, Jun 7, 5:20 PM CDT, 0 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
520 PM CDT TUE JUN 7 1994

...ALL TIMES CDT...

    TIME                  EVENT              LOCATION -CITY AND COUNTY

 505 PM         1 INCH DIAMETER HAIL        FAIRFAX IN BENTON CO.

 510 PM         1.5 INCH DIMATER HAIL       LAWFORD IN BENTON CO.

 515 PM         0.75 INCH DIAMETER HAIL     4 WEST OF SWISHER IN
                                            JOHNSON COUNTY.

ANDERSON

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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 6, 7:39 PM CDTSevere Thunderstorm WarningDMXFranklin29 min
Jun 6, 7:52 PM CDTSevere Thunderstorm WarningDMXWebster38 min
Jun 6, 8:02 PM CDTSevere Thunderstorm WarningDMXBoone43 min
Jun 6, 8:25 PM CDTTornado WarningDMXBoone50 min
Jun 6, 8:32 PM CDTSevere Thunderstorm WarningDMXHardin43 min
Jun 6, 9:01 PM CDTSevere Thunderstorm WarningDMXBoone40 min
Jun 6, 9:17 PM CDTSevere Thunderstorm WarningDMXMarshall30 min
Jun 6, 9:25 PM CDTSevere Thunderstorm WarningDMXPolk, Story31 min
Jun 7, 4:02 PM CDTSevere Thunderstorm WarningDMXBenton28 min
Jun 7, 4:19 PM CDTTornado WarningDMXBenton26 min
Jun 7, 4:41 PM CDTSevere Thunderstorm WarningDMXLinn49 min
Jun 7, 4:52 PM CDTSevere Thunderstorm WarningDMXBenton15 min
Jun 7, 5:57 PM CDTSevere Thunderstorm WarningDMXJohnson33 min
Jun 7, 6:16 PM CDTSevere Thunderstorm WarningDMXGreene44 min
Jun 7, 6:43 PM CDTSevere Thunderstorm WarningDMXBoone47 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1994Every severe thunderstorm warning in 1994

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.