Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 92, NWS Des Moines, IA

June 12, 1994Dickinson County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 12, 1994, 6:44 PM CDT for Dickinson County, Iowa. It was in force for 31 min.

The area

The counties it named.

The facts

Issued: Jun 12, 1994, 6:44 PM CDT (23:44 UTC)
Expired: Jun 12, 1994, 7:15 PM CDT
In force: 31 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Dickinson County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 11.7 hours before the alert went out and 205 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 7 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1636 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 142 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 12, 5:55 PM CDT, 49 minutes before

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Special weather statement, Jun 12, 5:57 PM CDT, 47 minutes before

IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038-
039-040-130000-

SPECIAL WEATHER STATEMENT...CORRECTION
NATIONAL WEATHER SERVICE WATERLOO IA
555 PM CDT SUN JUN 12 1994

...A LINE OF STRONG STORMS TO MOVE INTO NORTHEAST IOWA...

AT 550 PM RADAR WAS SHOWING A LINE OF STRONG THUNDERSTORMS FROM NEAR
CHARLES CITY...30 MILES EAST OF MASON CITY TO NEAR PARKERSBURG...20
MILES WEST OF WATERLOO. THESE STORMS WILL PRODUCE WINDS UP TO 50
MPH...1/4 TO 1/2 INCH HAIL...BRIEF VERY HEAVY RAINS AND FREQUENT DEADLY
LIGHTNING.

THESE STORMS WERE RACING TO THE EAST AT AROUND 40 MPH AND WILL AFFECT
THE FOLLOWING TOWNS:

CHARLES CITY - 550 PM THRU 610 PM
CLARKSVILLE
PARKERSBURG

NEW HAMPTON - 610 PM THRU 625 PM
TRIPOLI
WAVERLY
DENVER
WATERLOO/CEDAR FALLS

PEOPLE SHOULD MOVE INDOORS AS THESE STORMS APPROACH. A TORNADO WATCH
REMAINS IN EFFECT FOR AREAS ALONG AND WEST OF I-35 TILL 10 PM CDT.

STAY TUNED FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS.

COLLAR

Special weather statement, Jun 12, 6:20 PM CDT, 24 minutes before

IAZ003-004-014-130017-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
620 PM CDT SUN JUN 12 1994

...STRONG THUNDERSTORMS WILL MOVE INTO THE IOWA GREAT LAKES AREA...

STRONG THUNDERSTORMS OVER THE IOWA/MINNESOTA BORDER...BETWEEN SIOUX
FALLS AND ESTHERVILLE...ABOUT 80 MILES NORTHWEST OF SPENCER TO 30
MILES NORTHEAST OF SPENCER...WILL BE AFFECTING THE IOWA GREAT LAKES
AREA AFTER 630 PM CDT.  THE STORMS WERE MOVING EAST AT 35 MILES AN
HOUR AND ARE CAPABLE OF PRODUCING FREQUENT DANGEROUS LIGHTNING...WIND
GUSTS TO 50 MILES AN HOUR...HAIL...AND HEAVY RAINS.

PEOPLE BOATING ON THE LAKES SHOULD GET TO SAFE HARBOR AS QUICKLY AS
POSSIBLE.

CHB

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Special weather statement, Jun 12, 6:20 PM CDT, 24 minutes before

IAZ003-004-014-130017-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
620 PM CDT SUN JUN 12 1994

...STRONG THUNDERSTORMS WILL MOVE INTO THE IOWA GREAT LAKES AREA...

STRONG THUNDERSTORMS OVER THE IOWA/MINNESOTA BORDER...BETWEEN SIOUX
FALLS AND ESTHERVILLE...ABOUT 80 MILES NORTHWEST OF SPENCER TO 30
MILES NORTHEAST OF SPENCER...WILL BE AFFECTING THE IOWA GREAT LAKES
AREA AFTER 630 PM CDT.  THE STORMS WERE MOVING EAST AT 35 MILES AN
HOUR AND ARE CAPABLE OF PRODUCING FREQUENT DANGEROUS LIGHTNING...WIND
GUSTS TO 50 MILES AN HOUR...HAIL...AND HEAVY RAINS.

PEOPLE BOATING ON THE LAKES SHOULD GET TO SAFE HARBOR AS QUICKLY AS
POSSIBLE.

CHB

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Special weather statement, Jun 12, 6:35 PM CDT, 9 minutes before

IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038-
039-040-130100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
635 PM CDT SUN JUN 12 1994

...SHOWERS AND STORMS TO SPREAD INTO THE HIGHWAY 150 CORRIDOR...

AT 630 PM RADAR WAS SHOWING A LARGE AREA OF SHOWERS AND THUNDERSTORMS
ACROSS NORTHEAST AND NORTH CENTRAL IOWA. THE STRONGEST STORMS WERE
IN A LINE FROM 5 MILES SOUTHWEST OF DECORAH TO WATERLOO. THE STORMS
ARE CAPABLE OF PRODUCING ISOLATED GUSTS UP TO 50 MPH ALONG WITH PEA
SIZE HAIL...DEADLY LIGHTNING AND BRIEF HEAVY RAINS.

THE STRONGEST STORMS WERE MOVING EAST AT 40 MPH AND WILL AFFECT
THE FOLLOWING TOWNS:

FAYETTE     635 PM - 700 PM
WEST UNION
OELWEIN
INDEPENDENCE

WAUKON   700 PM - 720 PM
ELKADER
MANCHESTER

TRI STATE AREA INCLUDING DUBUQUE   720 - 740 PM

FOR AREAS ALONG AND WEST OF HIGHWAY 63 AN AREA OF LIGHT RAIN SHOWERS
WILL PERSIST THROUGH THE EVENING HOURS.

A TORNADO WATCH REMAINS IN EFFECT FOR AREAS ALONG AND WEST OF I-35
TILL 10 PM. MORE THUNDERSTORMS WERE MOVING INTO FAR NORTHWEST IOWA
AND WILL HAVE TO BE MONITORED FOR NORTH CENTRAL IOWA LATER THIS
EVENING.

STAY TUNED FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS.

COLLAR

Special weather statement, Jun 12, 6:37 PM CDT, 7 minutes before

IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038-
039-040-130100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
635 PM CDT SUN JUN 12 1994

...SHOWERS AND STORMS TO SPREAD INTO THE HIGHWAY 150 CORRIDOR...

AT 630 PM RADAR WAS SHOWING A LARGE AREA OF SHOWERS AND THUNDERSTORMS
ACROSS NORTHEAST AND NORTH CENTRAL IOWA. THE STRONGEST STORMS WERE
IN A LINE FROM 5 MILES SOUTHWEST OF DECORAH TO WATERLOO. THE STORMS
ARE CAPABLE OF PRODUCING ISOLATED GUSTS UP TO 50 MPH ALONG WITH PEA
SIZE HAIL...DEADLY LIGHTNING AND BRIEF HEAVY RAINS.

THE STRONGEST STORMS WERE MOVING EAST AT 40 MPH AND WILL AFFECT
THE FOLLOWING TOWNS:

FAYETTE     635 PM - 700 PM
WEST UNION
OELWEIN
INDEPENDENCE

WAUKON   700 PM - 720 PM
ELKADER
MANCHESTER

TRI STATE AREA INCLUDING DUBUQUE   720 - 740 PM

FOR AREAS ALONG AND WEST OF HIGHWAY 63 AN AREA OF LIGHT RAIN SHOWERS
WILL PERSIST THROUGH THE EVENING HOURS.

A TORNADO WATCH REMAINS IN EFFECT FOR AREAS ALONG AND WEST OF I-35
TILL 10 PM. MORE THUNDERSTORMS WERE MOVING INTO FAR NORTHWEST IOWA
AND WILL HAVE TO BE MONITORED FOR NORTH CENTRAL IOWA LATER THIS
EVENING.

STAY TUNED FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS.

COLLAR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 7:20 PM CDT	Severe Thunderstorm Warning	DMX	Lucas	25 min
Jun 12, 3:46 PM CDT	Severe Thunderstorm Warning	DMX	Emmet	29 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1994 Every 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.