Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 528, NWS Norman, OK

July 8, 2009Atoka County, Bryan County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 8, 2009, 3:30 PM CDT for Atoka County, Bryan County, Oklahoma. It was in force for 60 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: Jul 8, 2009, 3:30 PM CDT (20:30 UTC)
Expired: Jul 8, 2009, 4:30 PM CDT
In force: 60 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Atoka County, OK, Bryan County, OK

The radar

The Norman radar (KTLX), 166 km from the middle of the area, began a volume at 20:30 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, 8.5 hours before the alert went out and 164 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: 1619 J/kg
Mixed-layer CIN: -184 J/kg
Mixed-layer LCL: 1179 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.9

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 Jul 8, 12:48 PM CDT, 2 hours 42 minutes earlier.

Area forecast discussion, Jul 8, 12:48 PM CDT, 2 hours 42 minutes before

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Hazardous weather outlook, Jul 8, 11:35 AM CDT, 3 hours 55 minutes before

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In the hours before

Local storm report, Jul 8, 2:06 PM CDT, 1 hour 24 minutes before

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Local storm report, Jul 8, 2:29 PM CDT, 1 hour 1 minute before

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Local storm report, Jul 8, 2:37 PM CDT, 53 minutes before

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Special weather statement, Jul 8, 2:39 PM CDT, 51 minutes before

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Special weather statement, Jul 8, 2:56 PM CDT, 34 minutes before

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Special weather statement, Jul 8, 3:21 PM CDT, 9 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
Jul 8, 4:11 AM CDT	Heat Advisory	OUN	Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 42 more	9 days
Jul 8, 7:51 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	54 min
Jul 8, 8:55 AM CDT	Severe Thunderstorm Warning	OUN	Hughes	65 min
Jul 8, 9:29 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	61 min
Jul 8, 10:43 AM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	62 min
Jul 8, 10:54 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	66 min
Jul 8, 11:52 AM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	41 min
Jul 8, 1:19 PM CDT	Severe Thunderstorm Warning	OUN	McClain, Pottawatomie, Seminole	41 min
Jul 8, 1:56 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Murray, Pontotoc, Pottawatomie, Seminole	49 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

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.