Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 504, NWS Norman, OK

August 20, 2006Garvin County, McClain County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 20, 2006, 4:58 PM CDT for Garvin County, McClain County, Oklahoma. It was in force for 32 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, 4:58 PM CDT (21:58 UTC)
Expired: Aug 20, 2006, 5:30 PM CDT
In force: 32 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

Counties Garvin County, OK, McClain County, OK

The radar

The Norman radar (KTLX), 54 km from the middle of the area, began a volume at 22:02 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

Norman, OK (KOUN), launched 12:00Z, 10.0 hours before the alert went out and 40 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: 1208 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 1390 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 20, 2:54 PM CDT, 2 hours 4 minutes earlier.

Area forecast discussion, Aug 20, 2:54 PM CDT, 2 hours 4 minutes before

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Hazardous weather outlook, Aug 20, 12:05 PM CDT, 4 hours 53 minutes before

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In the hours before

Special weather statement, Aug 20, 3:52 PM CDT, 1 hour 6 minutes before

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Special weather statement, Aug 20, 4:02 PM CDT, 56 minutes before

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Special weather statement, Aug 20, 4:13 PM CDT, 45 minutes before

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Special weather statement, Aug 20, 4:20 PM CDT, 38 minutes before

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Special weather statement, Aug 20, 4:47 PM CDT, 11 minutes before

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Special weather statement, Aug 20, 4:54 PM CDT, 4 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 19, 7:02 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	43 min
Aug 20, 2:44 PM CDT	Severe Thunderstorm Warning	OUN	Johnston	31 min
Aug 20, 3:58 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	47 min
Aug 20, 4:25 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	35 min
Aug 20, 5:23 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	37 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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.