Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 286, NWS Norman, OK

May 31, 2011Carter County, Garvin County, Stephens County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 31, 2011, 3:47 AM CDT for Carter County, Garvin County, Stephens County, Oklahoma. It was in force for 21 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 31, 2011, 3:47 AM CDT (08:47 UTC)
Expired: May 31, 2011, 4:08 AM CDT
In force: 21 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Carter County, OK, Garvin County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 97 km from the middle of the area, began a volume at 08:46 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 00:00Z, 8.8 hours before the alert went out and 83 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: 2778 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 1325 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.1

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 31, 3:15 AM CDT, 32 minutes earlier.

Area forecast discussion, May 31, 3:15 AM CDT, 32 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, May 30, 10:20 PM CDT, 5 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
1020 PM CDT MON MAY 30 2011

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-
1020 PM CDT MON MAY 30 2011

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
ISOLATED SEVERE STORMS WILL BE POSSIBLE ACROSS FAR NORTHERN
OKLAHOMA.

DISCUSSION...
THUNDERSTORMS WILL REMAIN POSSIBLE OVERNIGHT...PRIMARILY ACROSS
NORTHWEST AND NORTH-CENTRAL OKLAHOMA. A COLD FRONT WILL MOVE INTO
NORTHWEST OKLAHOMA AFTER MIDNIGHT AND MOVE SLOWLY SOUTHEAST INTO
WESTERN AND CENTRAL OKLAHOMA AFTER DAYBREAK TUESDAY. SCATTERED
THUNDERSTORMS WILL BE POSSIBLE NEAR THIS FRONT. A FEW STORMS ACROSS
FAR NORTHERN OKLAHOMA MAY BRIEFLY REACH SEVERE LEVELS AND PRODUCE
LARGE HAIL. THIS THREAT IS PRIMARILY NEAR AND NORTH OF
WOODWARD...ENID...AND PONCA CITY.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY MAY 31.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...60 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...30 PERCENT.

OTHER HAZARDOUS WEATHER...
STRONG SOUTHERLY WINDS WILL CONTINUE ACROSS WESTERN AND NORTHERN
OKLAHOMA THROUGH MIDNIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORM CHANCES WILL CONTINUE TUESDAY AS THE COLD FRONT STALLS
ACROSS SOUTHWEST AND CENTRAL OKLAHOMA AND THEN LIFTS BACK NORTH. AN
ISOLATED SEVERE STORM OR TWO WILL ALSO BE POSSIBLE TUESDAY. STORM
CHANCES WILL END TUESDAY NIGHT AS AN UPPER RIDGE BEGINS TO BUILD
INTO THE REGION.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM TUESDAY.

In the hours before

Special weather statement, May 31, 1:32 AM CDT, 2 hours 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
132 AM CDT TUE MAY 31 2011

OKZ004>006-009-010-310700-
WOODWARD OK-HARPER OK-WOODS OK-ALFALFA OK-ELLIS OK-
132 AM CDT TUE MAY 31 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR ALFALFA...ELLIS...HARPER...
WOODS AND WOODWARD COUNTIES.

AT 132 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 18
MILES NORTH OF CAMP HOUSTON TO 6 MILES SOUTHWEST OF FORT SUPPLY...
MOVING EAST AT 50 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 55 MPH...

LAT...LON 3700 9845 3643 9903 3645 9978 3701 9917

Local storm report, May 31, 1:38 AM CDT, 2 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
138 AM CDT TUE MAY 31 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0130 AM     NON-TSTM WND GST 5 SE MANGUM             34.83N 99.44W
05/31/2011  M65 MPH          GREER              OK   MESONET

&&

MA

Special weather statement, May 31, 1:41 AM CDT, 2 hours 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
141 AM CDT TUE MAY 31 2011

OKZ021-022-033>036-310715-
BECKHAM OK-WASHITA OK-JACKSON OK-KIOWA OK-GREER OK-HARMON OK-
141 AM CDT TUE MAY 31 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR BECKHAM...GREER...HARMON...
JACKSON...KIOWA AND WASHITA COUNTIES.

AT 140 AM CDT...RADAR INDICATED STRONG TO SEVERE THUNDERSTORMS
MOVING ACROSS HARDEMAN AND HARMON COUNTIES.  OTHER SCATTERED SHOWERS
WERE FORMING HEAR ALTUS AND ROOSEVELT.  STRONG WIND GUSTS NEAR
60 MPH WILL BE POSSIBLE AS STORMS APPROACH FROM THE WEST.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH...
WIND GUSTS TO 60 MPH...

LAT...LON 3522 9972 3519 9896 3462 9908 3438 9965

Special weather statement, May 31, 2:13 AM CDT, 1 hour 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
213 AM CDT TUE MAY 31 2011

OKZ033-035>038-TXZ083-085-310745-
JACKSON OK-KIOWA OK-TILLMAN OK-COMANCHE OK-HARMON OK-HARDEMAN TX-
WILBARGER TX-
213 AM CDT TUE MAY 31 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR COMANCHE...HARDEMAN...
HARMON...JACKSON...KIOWA...TILLMAN AND WILBARGER COUNTIES.

AT 211 AM CDT...WIDELY SCATTERED STRONG THUNDERSTORMS WERE LOCATED
FROM HUMPHREYS TO ELMER TO CHILLICOTHE AND DUKE...MOVING EAST AT 40 MPH.

HAZARDS INCLUDE...
HAIL UP TO NICKLES...
WIND GUSTS TO 55 MPH...

LAT...LON 3473 9873 3451 9869 3421 9970 3467 9977

Local storm report, May 31, 3:08 AM CDT, 39 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 31, 3:41 AM CDT, 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 12:12 AM CDT	Special Weather Statement	OUN	Beckham	18 min
May 31, 12:24 AM CDT	Special Weather Statement	OUN	Harper	36 min
May 31, 12:39 AM CDT	Special Weather Statement	OUN	Harmon	21 min
May 31, 1:07 AM CDT	Special Weather Statement	OUN	Harmon	23 min
May 31, 1:23 AM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	52 min
May 31, 1:32 AM CDT	Special Weather Statement	OUN	Woods	28 min
May 31, 1:41 AM CDT	Special Weather Statement	OUN	Greer, Jackson	34 min
May 31, 2:13 AM CDT	Special Weather Statement	OUN	Jackson	32 min
May 31, 2:35 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa, Tillman	40 min
May 31, 3:41 AM CDT	Special Weather Statement	OUN	Stephens	34 min
May 31, 5:06 AM CDT	Special Weather Statement	OUN	Cleveland, Grady, McClain	39 min
May 31, 12:58 AM CDT	Special Weather Statement	OUN	Hardeman	32 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011 Every severe thunderstorm warning in 2011

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.