Alert archive / Texas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 671, NWS Norman, OK

August 16, 20138 counties in Texas

NWS Norman, OK issued this severe thunderstorm warning at Aug 16, 2013, 4:18 AM CDT for 8 counties in Texas. It was in force for 57 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 16, 2013, 4:18 AM CDT (09:18 UTC)
Expired: Aug 16, 2013, 5:15 AM CDT
In force: 57 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 57 km from the middle of the area, began a volume at 09:20 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, 9.3 hours before the alert went out and 277 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: 1231 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 2101 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.0

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 15, 6:40 PM CDT, 9 hours 38 minutes earlier.

Area forecast discussion, Aug 15, 6:40 PM CDT, 9 hours 38 minutes before

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Hazardous weather outlook, Aug 15, 5:13 PM CDT, 11 hours 5 minutes before

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</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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 15, 8:23 PM CDT	Special Weather Statement	OUN	Grant, Kay	52 min
Aug 15, 8:55 PM CDT	Special Weather Statement	OUN	Grant, Kay	20 min
Aug 15, 9:11 PM CDT	Special Weather Statement	OUN	Kay	49 min
Aug 15, 9:45 PM CDT	Areal Flood Advisory	OUN	Kay	2 hr
Aug 15, 10:19 PM CDT	Special Weather Statement	OUN	Woods	56 min
Aug 15, 10:31 PM CDT	Severe Thunderstorm Warning	OUN	Woods	29 min
Aug 15, 10:43 PM CDT	Special Weather Statement	OUN	Grant	47 min
Aug 15, 10:55 PM CDT	Special Weather Statement	OUN	Ellis	50 min
Aug 15, 10:57 PM CDT	Severe Thunderstorm Warning	OUN	Woods	33 min
Aug 15, 11:18 PM CDT	Special Weather Statement	OUN	Garfield	42 min
Aug 15, 11:31 PM CDT	Severe Thunderstorm Warning	OUN	Woods	44 min
Aug 15, 11:37 PM CDT	Special Weather Statement	OUN	Lincoln, Pottawatomie	38 min
Aug 15, 11:44 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	46 min
Aug 15, 11:56 PM CDT	Special Weather Statement	OUN	Garfield	49 min
Aug 16, 12:33 AM CDT	Special Weather Statement	OUN	Roger Mills	42 min
Aug 16, 12:45 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	45 min
Aug 16, 12:50 AM CDT	Special Weather Statement	OUN	Canadian	40 min
Aug 16, 1:10 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	50 min
Aug 16, 1:16 AM CDT	Special Weather Statement	OUN	Pontotoc	44 min
Aug 16, 1:20 AM CDT	Special Weather Statement	OUN	Custer	40 min
Aug 16, 1:52 AM CDT	Special Weather Statement	OUN	Caddo, Grady	38 min
Aug 16, 2:01 AM CDT	Special Weather Statement	OUN	Custer	44 min
Aug 16, 2:23 AM CDT	Special Weather Statement	OUN	Greer, Harmon, Jackson	52 min
Aug 16, 2:28 AM CDT	Special Weather Statement	OUN	Grady	47 min
Aug 16, 3:03 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	42 min
Aug 16, 3:28 AM CDT	Severe Thunderstorm Warning	OUN	Harmon	47 min
Aug 15, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Clay	31 min
Aug 16, 2:57 AM CDT	Special Weather Statement	OUN	Hardeman	48 min
Aug 16, 4:04 AM CDT	Special Weather Statement	OUN	Archer, Baylor, Clay, Wilbarger	41 min
Aug 16, 5:11 AM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	34 min

Nearby

Severe Thunderstorm Warnings in Texas, 2013 Every 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.