Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 558, NWS Norman, OK

July 17, 2009Carter County, Garvin County, Murray County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 17, 2009, 12:56 AM CDT for Carter County, Garvin County, Murray County, Oklahoma. It was in force for 64 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 17, 2009, 12:56 AM CDT (05:56 UTC)
Expired
Jul 17, 2009, 2:00 AM CDT
In force
64 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Carter County, OK, Garvin County, OK, Murray County, OK

The radar

The Norman radar (KTLX), 95 km from the middle of the area, began a volume at 05:58 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.

IssuedProductOfficeLasted
Jul 16, 4:34 PM CDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 5.9 hours before the alert went out and 183 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-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2009-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 550 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2009-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
550 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
2862 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 17, 12:20 AM CDT, 36 minutes earlier.

Area forecast discussion, Jul 17, 12:20 AM CDT, 36 minutes before
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Hazardous weather outlook, Jul 17, 12:30 AM CDT, 26 minutes before
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In the hours before

Local storm report, Jul 16, 11:10 PM CDT, 1 hour 46 minutes before
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Local storm report, Jul 16, 11:18 PM CDT, 1 hour 38 minutes before
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Special weather statement, Jul 16, 11:35 PM CDT, 1 hour 21 minutes before
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Special weather statement, Jul 16, 11:45 PM CDT, 1 hour 11 minutes before
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Local storm report, Jul 16, 11:46 PM CDT, 1 hour 10 minutes before
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Special weather statement, Jul 17, 12:00 AM CDT, 56 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 7:04 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Kiowa56 min
Jul 16, 7:46 PM CDTSevere Thunderstorm WarningOUNComanche, Cotton, Kiowa, Tillman59 min
Jul 16, 8:37 PM CDTSevere Thunderstorm WarningOUNBeckham, Ellis, Roger Mills53 min
Jul 16, 9:29 PM CDTSevere Thunderstorm WarningOUNBeckham, Custer, Roger Mills, Washita61 min
Jul 16, 10:06 PM CDTSevere Thunderstorm WarningOUNBeckham, Caddo, Custer, Greer, Jackson, Kiowa and 1 more54 min
Jul 16, 10:43 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Jackson, Kiowa, Tillman62 min
Jul 16, 11:21 PM CDTSevere Thunderstorm WarningOUNCotton, Tillman54 min
Jul 16, 11:51 PM CDTSevere Thunderstorm WarningOUNComanche, Grady, Stephens54 min
Jul 17, 12:10 AM CDTSevere Thunderstorm WarningOUNCleveland, Garvin, McClain65 min
Jul 17, 1:30 AM CDTSevere Thunderstorm WarningOUNCarter, Johnston, Marshall, Murray60 min
Jul 16, 9:13 PM CDTSevere Thunderstorm WarningOUNBaylor, Wilbarger62 min
Jul 17, 12:11 AM CDTSevere Thunderstorm WarningOUNArcher, Baylor49 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009Every 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.