Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 507, NWS Norman, OK

August 20, 2006Harmon County, Oklahoma; Hardeman County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Aug 20, 2006, 9:05 PM CDT for Harmon County, Oklahoma; Hardeman County, Texas. It was in force for 40 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: Aug 20, 2006, 9:05 PM CDT (02:05 UTC)
Expired: Aug 20, 2006, 9:45 PM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

Counties Harmon County, OK, Hardeman County, TX

The radar

The Altus AFB radar (KFDR), 77 km from the middle of the area, began a volume at 02:06 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 nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.1 hours before the alert went out and 191 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: 704 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1069 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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 Aug 20, 2:54 PM CDT, 6 hours 11 minutes earlier.

Area forecast discussion, Aug 20, 2:54 PM CDT, 6 hours 11 minutes before

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Hazardous weather outlook, Aug 20, 12:05 PM CDT, 9 hours before

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In the hours before

Local storm report, Aug 20, 7:35 PM CDT, 1 hour 30 minutes before

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Special weather statement, Aug 20, 7:39 PM CDT, 1 hour 26 minutes before

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Special weather statement, Aug 20, 7:46 PM CDT, 1 hour 19 minutes before

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Special weather statement, Aug 20, 8:10 PM CDT, 55 minutes before

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Special weather statement, Aug 20, 8:30 PM CDT, 35 minutes before

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Special weather statement, Aug 20, 8:45 PM CDT, 20 minutes before

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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 20, 7:15 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	45 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2006 Severe Thunderstorm Warnings in Texas, 2006 Every severe thunderstorm warning in 2006

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.