Alert archive / Iowa / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 218, NWS Des Moines, IA

August 14, 1993Jefferson County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 14, 1993, 7:00 PM CDT for Jefferson County, Iowa. It was in force for 45 min.

The area

The counties it named.

The facts

Issued: Aug 14, 1993, 7:00 PM CDT (00:00 UTC)
Expired: Aug 14, 1993, 7:45 PM CDT
In force: 45 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Jefferson County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 0.0 hours before the alert went out and 445 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: 1145 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 758 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 288 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.4

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 14, 3:46 PM CDT, 3 hours 14 minutes before

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Special weather statement, Aug 14, 3:50 PM CDT, 3 hours 10 minutes before

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Special weather statement, Aug 14, 4:44 PM CDT, 2 hours 16 minutes before

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Special weather statement, Aug 14, 5:40 PM CDT, 1 hour 20 minutes before

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Special weather statement, Aug 14, 6:31 PM CDT, 29 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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Special weather statement, Aug 14, 6:44 PM CDT, 16 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 4:19 AM CDT	Flash Flood Warning	DMX	Howard, Winneshiek	4 hr
Aug 15, 4:19 AM CDT	Flash Flood Warning	DMX	Mitchell	4 hr
Aug 15, 5:28 AM CDT	Flash Flood Warning	DMX	Chickasaw	3 hr

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.