Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 258, NWS Norman, OK

May 18, 20134 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 18, 2013, 6:41 AM CDT for 4 counties in Oklahoma. It was in force for 49 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
May 18, 2013, 6:41 AM CDT (11:41 UTC)
Expired
May 18, 2013, 7:30 AM CDT
In force
49 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Beckham County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK

The radar

The Altus AFB radar (KFDR), 83 km from the middle of the area, began a volume at 11:40 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, 11.7 hours before the alert went out and 193 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, Amarillo Airport, TX at 00:00Z on 2013-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1089 joules per kilogram.LCLEL10008507005003002001001 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, Amarillo Airport, TX at 00:00Z on 2013-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.193958Sfc1 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
1089 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
3224 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.8

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 May 18, 5:43 AM CDT, 58 minutes earlier.

Area forecast discussion, May 18, 5:43 AM CDT, 58 minutes before
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Hazardous weather outlook, May 18, 6:15 AM CDT, 26 minutes before
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In the hours before

Special weather statement, May 18, 6:02 AM CDT, 39 minutes before
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Local storm report, May 18, 6:28 AM CDT, 13 minutes before
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Local storm report, May 18, 6:31 AM CDT, 10 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 5:56 AM CDTSevere Thunderstorm WarningOUNGreer, Harmon, Jackson49 min
May 18, 6:02 AM CDTSpecial Weather StatementOUNBeckham, Ellis, Greer, Harmon, Roger Mills43 min
May 18, 6:45 AM CDTSpecial Weather StatementOUNBeckham, Custer, Dewey, Ellis, Greer, Harmon and 4 more30 min
May 18, 7:13 AM CDTSpecial Weather StatementOUNBeckham, Custer, Dewey, Ellis, Greer, Harmon and 4 more32 min
May 18, 4:21 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon, Jackson, Kiowa39 min
May 18, 4:30 PM CDTSpecial Weather StatementOUNJackson15 min
May 18, 4:49 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa41 min
May 18, 4:59 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon, Jackson46 min
May 18, 5:06 PM CDTSevere Thunderstorm WarningOUNWashita39 min
May 18, 5:14 PM CDTSpecial Weather StatementOUNHarper16 min
May 18, 5:25 PM CDTSevere Thunderstorm WarningOUNHarper50 min
May 18, 5:27 PM CDTSevere Thunderstorm WarningOUNBeckham48 min
May 18, 5:29 PM CDTSevere Thunderstorm WarningOUNKiowa46 min
May 18, 5:39 PM CDTSevere Thunderstorm WarningOUNCuster51 min
May 18, 5:44 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon, Jackson46 min
May 18, 5:45 PM CDTSevere Thunderstorm WarningOUNWashita45 min
May 18, 5:59 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa, Tillman, Washita46 min
May 18, 6:11 PM CDTSevere Thunderstorm WarningOUNBeckham, Custer, Roger Mills49 min
May 18, 6:40 PM CDTSpecial Weather StatementOUNDewey35 min
May 18, 6:43 PM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Custer, Kiowa, Washita47 min
May 18, 6:46 PM CDTSpecial Weather StatementOUNGreer29 min
May 18, 6:51 PM CDTSevere Thunderstorm WarningOUNHarper24 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2013Every severe thunderstorm warning in 2013

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.