Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 117, NWS Norman, OK

April 29, 2002Marshall County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 29, 2002, 9:32 PM CDT for Marshall County, Oklahoma. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 29, 2002, 9:32 PM CDT (02:32 UTC)
Expired: Apr 29, 2002, 10:15 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Marshall County, OK

The radar

The Norman radar (KTLX), 153 km from the middle of the area, began a volume at 02:35 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 29, 7:30 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.5 hours before the alert went out and 141 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: 4268 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 10.0

Open this sounding in Storm Lab

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.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 29, 9:30 PM CDT, 2 minutes earlier.

Area forecast discussion, Apr 29, 9:30 PM CDT, 2 minutes before

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In the hours before

Local storm report, Apr 29, 9:28 PM CDT, 4 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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 Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 29, 9:05 PM CDT	Severe Thunderstorm Warning	OUN	Love	40 min
Apr 29, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Clay	49 min
Apr 29, 10:47 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	43 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2002 Every severe thunderstorm warning in 2002

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; radar from the NEXRAD Level II archive.