Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 87, NWS Des Moines, IA

June 11, 1994Van Buren County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 11, 1994, 6:21 PM CDT for Van Buren County, Iowa. It was in force for 39 min.

The area

The counties it named.

The facts

Issued
Jun 11, 1994, 6:21 PM CDT (23:21 UTC)
Expired
Jun 11, 1994, 7:00 PM CDT
In force
39 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Van Buren County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.4 hours before the alert went out and 376 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 12:00Z on 1994-06-11Temperature 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, Omaha, NE at 12:00Z on 1994-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1261 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
195 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

Special weather statement, Jun 11, 4:36 PM CDT, 1 hour 45 minutes before
IAZALL-112240-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
436 PM CDT SAT JUN 11 1994

AT 427 PM...A SMALL CLUSTER OF STRONG THUNDERSTORMS HAD DEVELOPED OVER
SOUTH CENTRAL IOWA AROUND MOUNT AYR...LEON AND LAMONI OR SOME 45 TO 65
MILES SOUTH OF DES MOINES. THESE STORMS WILL PRODUCE BRIEF VERY HEAVY
RAIN...PEA TO MARBLE SIZED HAIL...DEADLY CLOUD TO GROUND LIGHTNING AND
WIND GUSTS OF 30 TO 40 MILES AN HOUR. THERE WAS ANOTHER CLUSTER OF
THUNDERSTORMS OVER NORTHEAST IOWA...MOST OF THESE STORMS WERE WITHIN
A 35 MILE RADIUS OF DUBUQUE. A FEW OF THESE STORMS WILL ALSO PRODUCE
HEAVY RAIN...SMALL HAIL AND DEADLY LIGHTNING.

THE STORMS WERE MOVING EAST AT 20 TO 25 MILES AN HOUR.

BARLOW
Special weather statement, Jun 11, 5:02 PM CDT, 1 hour 19 minutes before
IAZ054-112300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DUBUQUE IA
ISSUED BY WATERLOO IA
502 PM CDT SAT JUN 11 1994

...A STRONG THUNDERSTORM WILL PASS JUST NORTH OF MAQUOKETA...

AT 500 PM RADAR INDICATED A STRONG THUNDERSTORM 10 MILES SOUTH OF
DUBUQUE IN JACKSON COUNTY. THIS STORM WILL PRODUCE BRIEF HEAVY
RAIN...DEADLY LIGHTNING...1/4 TO 1/2 INCH HAIL AS IT MOVES EAST AT 30
MPH.

TOWNS TO BE AFFECTED BY THE STORM INCLUDE BELLEVUE...SPRINGBROOK AND
GREEN ISLAND. THE STORM WILL HAVE MOVED INTO ILLINOIS BY 545 PM.

IF YOU HAVE OUTDOOR ACTIVITIES YOU MAY WANT TO MOVE INDOORS UNTIL THE
STORM HAS PASSED.

COLLAR
Special weather statement, Jun 11, 5:16 PM CDT, 1 hour 5 minutes before
IAZ096-095-112315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
516 PM CDT SAT JUN 11 1994

...STRONG THUNDERSTORMS CONTINUED TO GRAZE THE IOWA-MISSOURI BORDER...

PEOPLE IN WAYNE AND APPANOOSE COUNTIES CAN EXPECT THUNDERSTORMS TO
ROLL THROUGH THE AREA BEFORE 600 PM. SOME OF THE STORMS COULD
PRODUCE UP TO MARBLE SIZED HAIL AND FREQUENT LIGHTNING.

WEATHER SERVICE DOPPLER RADAR SHOWED A CLUSTER OF STRONG THUNDERSTORMS
OVER SOUTHERN WAYNE COUNTY NEAR ALLERTON...WHICH IS 60 MILES SOUTH OF
DES MOINES.  THE STORM WAS MOVING EAST AT 25 MILES AN HOUR AND WAS
CAPABLE OF PRODUCING SMALL HAIL. LIGHTNING DETECTION SYSTEMS ALSO
SHOW NUMEROUS CLOUD-TO-GROUND LIGHTNING STRIKES WITH THIS CELL.

IF YOU ARE IN THE PATH OF THESE STORMS...MOVE INDOORS...ESPECIALLY
PEOPLE IN AND AROUND RATHBURN LAKE. IT IS DANGEORUS TO BE CAUGHT
OUTDOORS DURING AN ELECTRICAL STORM.

PYTLAK

WUUS01KABQ-9
Special weather statement, Jun 11, 5:17 PM CDT, 1 hour 4 minutes before
IAZ096-095-112315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
516 PM CDT SAT JUN 11 1994

...STRONG THUNDERSTORMS CONTINUED TO GRAZE THE IOWA-MISSOURI BORDER...

PEOPLE IN WAYNE AND APPANOOSE COUNTIES CAN EXPECT THUNDERSTORMS TO
ROLL THROUGH THE AREA BEFORE 600 PM. SOME OF THE STORMS COULD
PRODUCE UP TO MARBLE SIZED HAIL AND FREQUENT LIGHTNING.

WEATHER SERVICE DOPPLER RADAR SHOWED A CLUSTER OF STRONG THUNDERSTORMS
OVER SOUTHERN WAYNE COUNTY NEAR ALLERTON...WHICH IS 60 MILES SOUTH OF
DES MOINES.  THE STORM WAS MOVING EAST AT 25 MILES AN HOUR AND WAS
CAPABLE OF PRODUCING SMALL HAIL. LIGHTNING DETECTION SYSTEMS ALSO
SHOW NUMEROUS CLOUD-TO-GROUND LIGHTNING STRIKES WITH THIS CELL.

IF YOU ARE IN THE PATH OF THESE STORMS...MOVE INDOORS...ESPECIALLY
PEOPLE IN AND AROUND RATHBURN LAKE. IT IS DANGEORUS TO BE CAUGHT
OUTDOORS DURING AN ELECTRICAL STORM.

PYTLAK
Special weather statement, Jun 11, 5:19 PM CDT, 1 hour 2 minutes before
IAZ096-095-112315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
516 PM CDT SAT JUN 11 1994

...STRONG THUNDERSTORMS CONTINUED TO GRAZE THE IOWA-MISSOURI BORDER...

PEOPLE IN WAYNE AND APPANOOSE COUNTIES CAN EXPECT THUNDERSTORMS TO
ROLL THROUGH THE AREA BEFORE 600 PM. SOME OF THE STORMS COULD
PRODUCE UP TO MARBLE SIZED HAIL AND FREQUENT LIGHTNING.

WEATHER SERVICE DOPPLER RADAR SHOWED A CLUSTER OF STRONG THUNDERSTORMS
OVER SOUTHERN WAYNE COUNTY NEAR ALLERTON...WHICH IS 60 MILES SOUTH OF
DES MOINES.  THE STORM WAS MOVING EAST AT 25 MILES AN HOUR AND WAS
CAPABLE OF PRODUCING SMALL HAIL. LIGHTNING DETECTION SYSTEMS ALSO
SHOW NUMEROUS CLOUD-TO-GROUND LIGHTNING STRIKES WITH THIS CELL.

IF YOU ARE IN THE PATH OF THESE STORMS...MOVE INDOORS...ESPECIALLY
PEOPLE IN AND AROUND RATHBURN LAKE. IT IS DANGEORUS TO BE CAUGHT
OUTDOORS DURING AN ELECTRICAL STORM.

PYTLAK
Special weather statement, Jun 11, 5:42 PM CDT, 39 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 10, 7:16 PM CDTSevere Thunderstorm WarningDMXCass29 min
Jun 10, 7:36 PM CDTSevere Thunderstorm WarningDMXCass39 min
Jun 10, 7:57 PM CDTSevere Thunderstorm WarningDMXCass33 min
Jun 10, 8:29 PM CDTSevere Thunderstorm WarningDMXAdams31 min
Jun 10, 8:39 PM CDTSevere Thunderstorm WarningDMXUnion36 min
Jun 11, 5:22 PM CDTSevere Thunderstorm WarningDMXAppanoose38 min
Jun 11, 5:51 PM CDTSevere Thunderstorm WarningDMXDavis39 min
Jun 11, 6:32 PM CDTSevere Thunderstorm WarningDMXRinggold17 min
Jun 11, 6:32 PM CDTSevere Thunderstorm WarningDMXDecatur43 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.