Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 235, NWS Norman, OK

May 9, 2013Jackson County, Tillman County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 9, 2013, 6:35 PM CDT for Jackson County, Tillman County, Oklahoma. It was in force for 40 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 9, 2013, 6:35 PM CDT (23:35 UTC)
Expired: May 9, 2013, 7:15 PM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Jackson County, OK, Tillman County, OK

The radar

The Altus AFB radar (KFDR), 22 km from the middle of the area, began a volume at 23:35 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, 11.6 hours before the alert went out and 181 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: 162 J/kg
Mixed-layer CIN: -316 J/kg
Mixed-layer LCL: 887 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 390 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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 9, 6:19 PM CDT, 16 minutes earlier.

Area forecast discussion, May 9, 6:19 PM CDT, 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
619 PM CDT THU MAY 9 2013

.AVIATION...
0Z TAFS... SCATTERED SHOWERS/STORMS WILL AFFECT PARTS OF OK AND
WESTERN NORTH TEXAS TONIGHT INTO FRI MORNING. SHOWERS/STORMS MAY
LINGER INTO FRI AFTERNOON IN PARTS OF CENTRAL/SOUTHERN OK AND
WESTERN NORTH TEXAS BUT CHANCES TOO LOW FOR MENTION IN THE TAF.
STRONG AND VARIABLE WINDS AND HAIL COULD BE POSSIBLE WITH/NEAR ANY
OF THE STORMS TONIGHT INTO EARLY FRI.

&&

.PREV DISCUSSION... /ISSUED 252 PM CDT THU MAY 9 2013/

DISCUSSION...
COMPLEX WEATHER FORECAST THIS EVENING. MULTIPLE BOUNDARIES ARE IN
THE AREA AND CLOUDINESS HAS LIMITED WARMING. BUT MESOANALYSIS
SHOWS INSTABILITY HAS BEEN INCREASING AND CIN WEAKENING. 12Z OUN
SOUNDING SHOWED IT WOULD NOT TAKE MUCH WARMING TO ELIMINATE THE
CIN. WATER VAPOR SATELLITE ALSO SHOWS WHAT APPEARS TO BE A WAVE
MOVING THROUGH WEST TEXAS AND BEGINNING TO ENHANCE LIFT. OVERALL
RESULT SHOULD BE SCATTERED STORMS DEVELOPING THIS AFTERNOON AND
EVENING. INSTABILITY IS HIGH ENOUGH THAT SEVERE WEATHER WILL BE
POSSIBLE. STORM CHANCES WILL PERSIST INTO TOMORROW EVENING.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  55  76  51  73 /  50  20  10  10
HOBART OK         54  75  50  76 /  50  20  10  10
WICHITA FALLS TX  55  78  53  79 /  40  30  10  10
GAGE OK           49  71  48  74 /  30  10  10  20
PONCA CITY OK     56  73  50  74 /  50  20  10  20
DURANT OK         58  79  55  78 /  40  30  20   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

25/25/25

Hazardous weather outlook, May 9, 11:55 AM CDT, 6 hours 40 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT THU MAY 9 2013

OKZ004>048-050>052-TXZ083>090-100000-
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-
1155 AM CDT THU MAY 9 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

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

LOCATION...THE SLIGHT RISK AREA IS SOUTH OF A LINE FROM HOLLIS TO ELK CITY
TO TALOGA TO MEDFORD.

TIMING...2 PM UNTIL MIDNIGHT

HAZARDS...LARGE HAIL TO BASEBALL DIAMETER...DAMAGING WIND...ISOLATED
TORNADOES.

DISCUSSION...
SURFACE MOISTURE WILL CONTINUE TO INCREASE THIS AFTERNOON SOUTH OF A
SLOWLY-MOVING COLD FRONT. CONVERGENCE ALONG THE FRONT...AND SURFACE HEATING
WITH ITS ASSOCIATED LOW-LEVEL INSTABILITY...WILL SUPPORT THE DEVELOPMENT
OF THUNDERSTORMS THIS AFTERNOON AND EVENING. STRONG INSTABILITY ALOFT WILL
THEN SUPPORT LARGE HAIL AND STRONG WINDS WITH MANY OF THE STORMS. SUPERCELL
STRUCTURES ARE EXPECTED IN SOME CASES...AND TORNADOES MAY OCCUR WITH THESE
STORMS...WHICH WILL BE MOST LIKELY ACROSS THE SOUTHWEST PARTS OF OKLAHOMA
AND WESTERN NORTH TEXAS THIS AFTERNOON. STORMS ARE EXPECTED TO WEAKEN WITHIN
SEVERAL HOURS AFTER SUNSET.

PROBABILITY TABLE...VALID THROUGH 700 AM CDT FRIDAY MAY 9.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...100 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

THUNDERSTORM OUTLOOK...
THERE ARE LOW CHANCES FOR THUNDERSTORMS INTO THE WEEKEND. NONE ARE EXPECTED
TO BE SEVERE.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 5 AM FRIDAY.

CMS

In the hours before

Local storm report, May 9, 5:09 PM CDT, 1 hour 26 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, May 9, 5:29 PM CDT, 1 hour 6 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, May 9, 5:39 PM CDT, 56 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, May 9, 5:48 PM CDT, 47 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, May 9, 5:54 PM CDT, 41 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, May 9, 5:56 PM CDT, 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
556 PM CDT THU MAY 9 2013

OKZ035-092330-
KIOWA OK-
556 PM CDT THU MAY 9 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN KIOWA COUNTY UNTIL
630 PM CDT...

AT 551 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING FROM
4 MILES SOUTH OF CARNEGIE TO 5 MILES NORTHWEST OF COOPERTON...MOVING
NORTHEAST AT 10 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LAT...LON 3504 9897 3512 9863 3510 9862 3501 9862
      3501 9861 3495 9862 3484 9896
TIME...MOT...LOC 2251Z 237DEG 10KT 3504 9863 3493 9893

..SPEG.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 7:03 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo	27 min
May 8, 7:09 PM CDT	Severe Thunderstorm Warning	OUN	Major	51 min
May 8, 7:10 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	50 min
May 8, 7:14 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	46 min
May 8, 7:17 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	43 min
May 8, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	46 min
May 8, 7:37 PM CDT	Areal Flood Warning	OUN	Canadian	3 hr
May 8, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Comanche, Grady	49 min
May 8, 8:13 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	47 min
May 8, 8:26 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Stephens	49 min
May 8, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	46 min
May 8, 8:36 PM CDT	Severe Thunderstorm Warning	OUN	Harper	39 min
May 8, 8:46 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	44 min
May 8, 9:10 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, Lincoln, McClain, Oklahoma, Pontotoc and 2 more	50 min
May 8, 9:32 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	43 min
May 8, 10:16 PM CDT	Special Weather Statement	OUN	Woodward	29 min
May 8, 10:18 PM CDT	Special Weather Statement	OUN	Logan	27 min
May 8, 10:20 PM CDT	Special Weather Statement	OUN	Lincoln, Seminole	25 min
May 8, 10:33 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Oklahoma	42 min
May 8, 10:47 PM CDT	Special Weather Statement	OUN	Hughes, Seminole	28 min
May 8, 10:48 PM CDT	Special Weather Statement	OUN	Ellis, Woodward	27 min
May 8, 11:21 PM CDT	Special Weather Statement	OUN	Logan	24 min
May 8, 11:23 PM CDT	Special Weather Statement	OUN	Ellis, Woods, Woodward	37 min
May 8, 11:41 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Major, Roger Mills, Woods, Woodward	49 min
May 9, 12:05 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan	40 min
May 9, 12:24 AM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Ellis, Major, Roger Mills, Woodward	66 min
May 9, 12:44 AM CDT	Special Weather Statement	OUN	Alfalfa, Grant	31 min
May 9, 1:25 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey	50 min
May 9, 1:27 AM CDT	Special Weather Statement	OUN	Garfield, Grant, Kay	48 min
May 9, 2:03 AM CDT	Special Weather Statement	OUN	Kay, Kingfisher, Logan, Noble	57 min
May 9, 3:05 AM CDT	Special Weather Statement	OUN	Canadian	25 min
May 9, 1:37 PM CDT	Special Weather Statement	OUN	Kiowa	23 min
May 9, 2:00 PM CDT	Special Weather Statement	OUN	Kiowa	30 min
May 9, 2:32 PM CDT	Special Weather Statement	OUN	Comanche	28 min
May 9, 2:55 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	50 min
May 9, 3:18 PM CDT	Special Weather Statement	OUN	Stephens	27 min
May 9, 4:06 PM CDT	Special Weather Statement	OUN	Stephens	24 min
May 9, 4:43 PM CDT	Special Weather Statement	OUN	Comanche	32 min
May 9, 5:29 PM CDT	Special Weather Statement	OUN	Caddo	16 min
May 9, 5:39 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	51 min
May 9, 5:48 PM CDT	Special Weather Statement	OUN	Tillman	27 min
May 9, 5:56 PM CDT	Special Weather Statement	OUN	Kiowa	34 min
May 9, 6:49 PM CDT	Special Weather Statement	OUN	Canadian	26 min
May 9, 6:50 PM CDT	Special Weather Statement	OUN	Kiowa	25 min
May 8, 7:06 PM CDT	Severe Thunderstorm Warning	OUN	Foard	39 min
May 9, 3:16 PM CDT	Special Weather Statement	OUN	Baylor	29 min
May 9, 6:46 PM CDT	Special Weather Statement	OUN	Hardeman	29 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.