Alert archive / Iowa / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 199, NWS Des Moines, IA

August 9, 1993Worth County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 9, 1993, 4:35 PM CDT for Worth County, Iowa. It was in force for 55 min.

The area

The counties it named.

The facts

Issued: Aug 9, 1993, 4:35 PM CDT (21:35 UTC)
Expired: Aug 9, 1993, 5:30 PM CDT
In force: 55 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Worth County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 9.6 hours before the alert went out and 166 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: 1750 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 649 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.8

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, Aug 9, 1:37 PM CDT, 2 hours 58 minutes before

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Special weather statement, Aug 9, 2:25 PM CDT, 2 hours 10 minutes before

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Special weather statement, Aug 9, 2:29 PM CDT, 2 hours 6 minutes before

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Special weather statement, Aug 9, 2:34 PM CDT, 2 hours 1 minute before

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Special weather statement, Aug 9, 3:12 PM CDT, 1 hour 23 minutes before

IAZ050>052-062>064-092100-

SPECIAL WEATHER STATMENT
NATIONAL WEATHER SERVICE DES MOINES IA
315 PM CDT MON AUG 9 1993

...SEVERE THUNDERSTORM WATCH NUMBER 774 IS NO LONGER IN EFFECT FOR
EASTERN IOWA...

THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR A PART OF EASTERN
IOWA HAS BEEN CANCELLED. THUNDERSTORMS ARE EXPECTED TO REDEVELOP AFTER
7 PM THIS EVENING OVER PARTS OF EAST CENTRAL IOWA.

SMITH

Special weather statement, Aug 9, 3:15 PM CDT, 1 hour 20 minutes before

IAZ050>052-062>064-092100-

SPECIAL WEATHER STATMENT
NATIONAL WEATHER SERVICE DES MOINES IA
315 PM CDT MON AUG 9 1993

...SEVERE THUNDERSTORM WATCH NUMBER 774 IS NO LONGER IN EFFECT FOR
EASTERN IOWA...

THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR A PART OF EASTERN
IOWA HAS BEEN CANCELLED. THUNDERSTORMS ARE EXPECTED TO REDEVELOP AFTER
7 PM THIS EVENING OVER PARTS OF EAST CENTRAL IOWA.

SMITH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 9:03 AM CDT	Severe Thunderstorm Warning	DMX	Fayette	57 min
Aug 9, 4:35 PM CDT	Severe Thunderstorm Warning	DMX	Winnebago	50 min
Aug 9, 4:52 PM CDT	Severe Thunderstorm Warning	DMX	Howard, Mitchell	68 min
Aug 9, 5:55 PM CDT	Severe Thunderstorm Warning	DMX	Chickasaw	35 min
Aug 9, 6:02 PM CDT	Tornado Warning	DMX	Chickasaw	28 min
Aug 9, 6:19 PM CDT	Severe Thunderstorm Warning	DMX	Fayette	46 min
Aug 9, 6:41 PM CDT	Severe Thunderstorm Warning	DMX	Winnebago	49 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1993 Every 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.