Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 188, NWS Des Moines, IA

September 21, 1994Boone County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Sep 21, 1994, 6:00 PM CDT for Boone County, Iowa. It was in force for 20 min.

The area

The counties it named.

The facts

Issued: Sep 21, 1994, 6:00 PM CDT (23:00 UTC)
Expired: Sep 21, 1994, 6:20 PM CDT
In force: 20 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Boone County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 11.0 hours before the alert went out and 314 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, 5:23 PM CDT, 37 minutes before

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Special weather statement, Sep 21, 5:28 PM CDT, 32 minutes before

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Local storm report, Sep 21, 5:44 PM CDT, 16 minutes before

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Special weather statement, Sep 21, 5:45 PM CDT, 15 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Special weather statement, Sep 21, 5:50 PM CDT, 10 minutes before

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<body>
  <main class="wrap">
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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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Local storm report, Sep 21, 6:00 PM CDT, 0 minutes before

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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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
Sep 21, 3:14 PM CDT	Severe Thunderstorm Warning	DMX	Emmet	31 min
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	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.