Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 180, NWS Des Moines, IA

September 21, 1994Emmet County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Sep 21, 1994, 3:14 PM CDT for Emmet County, Iowa. It was in force for 31 min.

The area

The counties it named.

The facts

Issued: Sep 21, 1994, 3:14 PM CDT (20:14 UTC)
Expired: Sep 21, 1994, 3:45 PM CDT
In force: 31 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Emmet County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 8.2 hours before the alert went out and 185 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: 49 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 834 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 93 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, Sep 21, 2:29 PM CDT, 45 minutes before

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Special weather statement, Sep 21, 2:30 PM CDT, 44 minutes before

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Special weather statement, Sep 21, 2:42 PM CDT, 32 minutes before

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Special weather statement, Sep 21, 2:44 PM CDT, 30 minutes before

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Special weather statement, Sep 21, 2:52 PM CDT, 22 minutes before

IAZ036-037-212100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
252 PM CDT WED SEP 21 1994

...STRONG STORMS WERE DEVELOPING IN CENTRAL IOWA...

AT 250 PM CDT NATIONAL WEATHER SERVICE RADAR INDICATED A STRONG
THUNDERSTORM JUST EAST OF WEBSTER CITY OR ABOUT 60 MILES NORTH OF DES
MOINES. THIS STORM HAS THE POTENTIAL TO PRODUCE HALF-INCH DIAMETER HAIL
AS IT MOVES EAST AT 25 MILES AN HOUR.  THESE STORMS WERE LOCATED IN
EASTERN HAMILTON COUNTY. BRIEF HEAVY RAIN WILL ACCOMPANY THIS STORM.

PERSONS IN THE PATH OF THIS STORM SHOULD SEEK SHELTER.

Special weather statement, Sep 21, 2:53 PM CDT, 21 minutes before

IAZ036-037-212100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
252 PM CDT WED SEP 21 1994

...STRONG STORMS WERE DEVELOPING IN CENTRAL IOWA...

AT 250 PM CDT NATIONAL WEATHER SERVICE RADAR INDICATED A STRONG
THUNDERSTORM JUST EAST OF WEBSTER CITY OR ABOUT 60 MILES NORTH OF DES
MOINES. THIS STORM HAS THE POTENTIAL TO PRODUCE HALF-INCH DIAMETER HAIL
AS IT MOVES EAST AT 25 MILES AN HOUR.  THESE STORMS WERE LOCATED IN
EASTERN HAMILTON COUNTY. BRIEF HEAVY RAIN WILL ACCOMPANY THIS STORM.

PERSONS IN THE PATH OF THIS STORM SHOULD SEEK SHELTER.

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 21, 3:19 PM CDT	Severe Thunderstorm Warning	DMX	Story	26 min
Sep 21, 3:49 PM CDT	Severe Thunderstorm Warning	DMX	Butler	22 min
Sep 21, 3:49 PM CDT	Severe Thunderstorm Warning	DMX	Clay	41 min
Sep 21, 3:54 PM CDT	Severe Thunderstorm Warning	DMX	Pocahontas	41 min
Sep 21, 4:07 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	38 min
Sep 21, 4:20 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	40 min
Sep 21, 4:59 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton	31 min
Sep 21, 6:00 PM CDT	Severe Thunderstorm Warning	DMX	Boone	20 min
Sep 21, 6:00 PM CDT	Severe Thunderstorm Warning	DMX	Story	45 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.