Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 56, NWS Norman, OK

March 30, 2013Hughes County, Seminole County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 30, 2013, 7:46 PM CDT for Hughes County, Seminole County, Oklahoma. It was in force for 44 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: Mar 30, 2013, 7:46 PM CDT (00:46 UTC)
Expired: Mar 30, 2013, 8:30 PM CDT
In force: 44 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Hughes County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 81 km from the middle of the area, began a volume at 00:48 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.

Issued	Product	Office	Lasted
Mar 30, 6:06 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 0.8 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-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: 354 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 2229 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Mar 30, 6:36 PM CDT, 1 hour 10 minutes earlier.

Area forecast discussion, Mar 30, 6:36 PM CDT, 1 hour 10 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Mar 30, 12:00 PM CDT, 7 hours 46 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1200 PM CDT SAT MAR 30 2013

OKZ004>048-050>052-TXZ083>090-311000-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
1200 PM CDT SAT MAR 30 2013

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...TODAY AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS MUCH OF OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA IS SOUTHEAST OF A LINE FROM ARNETT TO MEDFORD.
THE SLIGHT RISK AREA INCLUDES ALL OF WESTERN NORTH TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM LATE
THIS AFTERNOON INTO THE EVENING AND OVERNIGHT.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PREPARE FOR POSSIBLE SEVERE WEATHER OPERATIONS THIS
AFTERNOON THROUGH TONIGHT.

DISCUSSION...
MODERATE INSTABILITY WILL AGAIN BE IN PLACE ACROSS OKLAHOMA AND
NORTH TEXAS TODAY. SEVERAL WEAK WAVES IN THE FLOW ALOFT...ALONG
WITH SEVERAL BOUNDARIES AT THE SURFACE...WILL SUPPORT SOME
THUNDERSTORM DEVELOPMENT. AFTERNOON HEATING WILL ENHANCE THE
INSTABILITY...AND STORMS WILL LIKELY DEVELOP LATE THIS AFTERNOON
OR EARLY EVENING. A WEAK COLD FRONT WILL MOVE SOUTHEAST THROUGH THE
AREA TODAY AND TONIGHT... AND LOW-LEVEL CONVERGENCE ALONG THIS FRONT
WILL HELP SUSTAIN STORM DEVELOPMENT INTO THE NIGHT. THE MAIN CONCERNS
WITH THESE STORMS WILL BE LARGE HAIL... ALTHOUGH STRONG WINDS WILL
ALSO BE POSSIBLE. THE RISK WILL DIMINISH FROM NORTHWEST TO SOUTHEAST
WITH TIME AS THE FRONT MOVES THROUGH.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SUNDAY MAR 31.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...80 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...60 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS CHANCES WILL PERSIST INTO SUNDAY. THUNDERSTORM
CHANCES WILL AGAIN DEVELOP MONDAY AND EARLY TUESDAY.

OTHER HAZARDOUS WEATHER...
TEMPERATURES WILL DROP TO AROUND FREEZING IN NORTHERN OKLAHOMA TUESDAY
AND WEDNESDAY MORNINGS.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 5 AM
SUNDAY MARCH 31.

.26.

In the hours before

Special weather statement, Mar 30, 7:22 PM CDT, 24 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Mar 30, 7:30 PM CDT, 16 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Mar 30, 7:33 PM CDT, 13 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Mar 30, 7:35 PM CDT, 11 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Mar 30, 7:41 PM CDT, 5 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Mar 30, 7:42 PM CDT, 4 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	60 min
Mar 30, 7:05 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	40 min
Mar 30, 7:22 PM CDT	Special Weather Statement	OUN	Grady	8 min
Mar 30, 7:38 PM CDT	Severe Thunderstorm Warning	OUN	Grady	52 min
Mar 30, 7:42 PM CDT	Special Weather Statement	OUN	Cotton	33 min
Mar 30, 7:52 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	38 min
Mar 30, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Grady	50 min
Mar 30, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	47 min
Mar 30, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	46 min
Mar 30, 8:55 PM CDT	Special Weather Statement	OUN	McClain	20 min
Mar 30, 9:10 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	50 min
Mar 30, 9:14 PM CDT	Severe Thunderstorm Warning	OUN	Grady	46 min
Mar 30, 9:59 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes	46 min
Mar 30, 10:45 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes	60 min
Mar 30, 11:41 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	64 min
Mar 31, 2:31 AM CDT	Special Weather Statement	OUN	Washita	44 min
Mar 31, 2:32 AM CDT	Special Weather Statement	OUN	Grant	43 min
Mar 31, 2:33 AM CDT	Special Weather Statement	OUN	Blaine, Canadian, Kingfisher, Oklahoma	27 min
Mar 31, 2:34 AM CDT	Special Weather Statement	OUN	Caddo	41 min
Mar 31, 2:37 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	53 min
Mar 31, 2:57 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian	63 min
Mar 31, 3:03 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	42 min
Mar 31, 3:21 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	39 min
Mar 31, 3:24 AM CDT	Severe Thunderstorm Warning	OUN	Washita	66 min
Mar 31, 3:49 AM CDT	Special Weather Statement	OUN	Grady	26 min
Mar 31, 3:49 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	41 min
Mar 31, 4:13 AM CDT	Special Weather Statement	OUN	Grady	47 min
Mar 31, 4:17 AM CDT	Special Weather Statement	OUN	Greer	43 min
Mar 31, 4:25 AM CDT	Special Weather Statement	OUN	Pottawatomie	35 min
Mar 31, 4:33 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Pontotoc, Pottawatomie, Seminole	42 min
Mar 31, 4:57 AM CDT	Special Weather Statement	OUN	Carter, Garvin, Stephens	48 min
Mar 31, 5:03 AM CDT	Special Weather Statement	OUN	Hughes, Murray, Pontotoc	42 min
Mar 31, 5:08 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray	67 min
Mar 31, 5:14 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Garvin, Pontotoc	46 min
Mar 31, 5:16 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Johnston, Murray	29 min
Mar 31, 5:38 AM CDT	Severe Thunderstorm Warning	OUN	Johnston, Murray	37 min
Mar 31, 5:55 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston, Pontotoc	50 min
Mar 31, 6:02 AM CDT	Severe Thunderstorm Warning	OUN	Bryan, Carter, Johnston, Love, Marshall	58 min
Mar 31, 6:08 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	52 min
Mar 31, 7:00 AM CDT	Special Weather Statement	OUN	Bryan	30 min
Mar 31, 8:17 AM CDT	Special Weather Statement	OUN	Comanche, Kiowa	28 min
Mar 31, 8:47 AM CDT	Special Weather Statement	OUN	Caddo, Comanche	28 min
Mar 30, 7:30 PM CDT	Special Weather Statement	OUN	Foard	30 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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.