Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 573, NWS Norman, OK

July 31, 2015Tillman County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 31, 2015, 3:33 PM CDT for Tillman County, Oklahoma. It was in force for 42 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: Jul 31, 2015, 3:33 PM CDT (20:33 UTC)
Expired: Jul 31, 2015, 4:15 PM CDT
In force: 42 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Tillman County, OK

The radar

The Altus AFB radar (KFDR), 5 km from the middle of the area, began a volume at 20:35 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 8.6 hours before the alert went out and 271 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: 1099 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 844 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 31, 3:01 PM CDT, 32 minutes earlier.

Area forecast discussion, Jul 31, 3:01 PM 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, Jul 31, 3:20 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>

In the hours before

Special weather statement, Jul 31, 1:56 PM CDT, 1 hour 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
156 PM CDT FRI JUL 31 2015

OKZ014>016-021-022-034>036-TXZ083>085-311930-
GREER OK-ROGER MILLS OK-CUSTER OK-BECKHAM OK-DEWEY OK-KIOWA OK-
JACKSON OK-WASHITA OK-WILBARGER TX-HARDEMAN TX-FOARD TX-
156 PM CDT FRI JUL 31 2015

...SIGNIFICANT WEATHER ADVISORY FOR GREER...EASTERN ROGER MILLS...
WESTERN CUSTER...EASTERN BECKHAM...SOUTHWESTERN DEWEY...WESTERN
KIOWA...JACKSON...WESTERN WASHITA...NORTHWESTERN WILBARGER...
SOUTHEASTERN HARDEMAN AND EAST CENTRAL FOARD COUNTIES UNTIL 230 PM
CDT...

AT 155 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING FROM
NEAR LEEDEY TO NEAR ELK CITY TO 4 MILES EAST OF MANGUM TO 5 MILES
SOUTHEAST OF MEDICINE MOUND...MOVING SOUTHEAST AT 25 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 40 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...
FREQUENT CLOUD TO GROUND LIGHTNING...

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 27 AND 65.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3541 9959 3596 9950 3575 9895 3513 9901
      3403 9938 3409 9967
TIME...MOT...LOC 1855Z 310DEG 21KT 3587 9934 3539 9938 3489 9943 3412
9953

Special weather statement, Jul 31, 2:32 PM CDT, 1 hour 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
232 PM CDT FRI JUL 31 2015

OKZ015-016-022-035>037-TXZ084-085-088-312000-
CUSTER OK-TILLMAN OK-DEWEY OK-KIOWA OK-JACKSON OK-WASHITA OK-
WILBARGER TX-BAYLOR TX-FOARD TX-
232 PM CDT FRI JUL 31 2015

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CUSTER...WESTERN
TILLMAN...CENTRAL DEWEY...CENTRAL KIOWA...EASTERN JACKSON...CENTRAL
WASHITA...WILBARGER...NORTHERN BAYLOR AND EAST CENTRAL FOARD COUNTIES
UNTIL 300 PM CDT...

AT 231 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING FROM
3 MILES EAST OF CAMARGO TO 3 MILES EAST OF FOSS TO 7 MILES NORTH OF
WARREN TO 5 MILES NORTH OF FARGO TO 9 MILES SOUTHEAST OF THALIA...
MOVING EAST AT 30 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 40 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...
FREQUENT CLOUD TO GROUND LIGHTNING...

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 53 AND 75.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3384 9952 3439 9933 3549 9918 3611 9932
      3608 9884 3539 9880 3363 9907
TIME...MOT...LOC 1931Z 289DEG 26KT 3602 9923 3547 9911 3488 9917 3438
9926 3389 9943

30

Local storm report, Jul 31, 2:59 PM CDT, 34 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, Jul 31, 3:02 PM CDT, 31 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, Jul 31, 3:07 PM CDT, 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, Jul 31, 3:19 PM CDT, 14 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
Jul 31, 8:58 AM CDT	Special Weather Statement	OUN	Comanche	32 min
Jul 31, 9:42 AM CDT	Special Weather Statement	OUN	Pontotoc	33 min
Jul 31, 12:44 PM CDT	Special Weather Statement	OUN	Roger Mills	31 min
Jul 31, 1:56 PM CDT	Special Weather Statement	OUN	Custer, Greer, Jackson	34 min
Jul 31, 2:32 PM CDT	Special Weather Statement	OUN	Custer, Dewey, Kiowa, Washita	28 min
Jul 31, 3:02 PM CDT	Special Weather Statement	OUN	Custer, Dewey, Kiowa, Tillman, Washita	28 min
Jul 31, 3:05 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Tillman	40 min
Jul 31, 3:19 PM CDT	Special Weather Statement	OUN	Oklahoma	26 min
Jul 31, 3:41 PM CDT	Special Weather Statement	OUN	Oklahoma	34 min
Jul 31, 3:56 PM CDT	Special Weather Statement	OUN	Caddo	34 min
Jul 31, 4:16 PM CDT	Areal Flood Advisory	OUN	Caddo, Washita	3 hr
Jul 31, 4:28 PM CDT	Special Weather Statement	OUN	Caddo	32 min
Jul 31, 4:31 PM CDT	Special Weather Statement	OUN	Logan	44 min
Jul 31, 4:37 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	38 min
Jul 31, 4:55 PM CDT	Special Weather Statement	OUN	Canadian	50 min
Jul 31, 5:06 PM CDT	Special Weather Statement	OUN	Grady	54 min
Jul 31, 5:14 PM CDT	Special Weather Statement	OUN	Grady	61 min
Jul 31, 5:48 PM CDT	Areal Flood Advisory	OUN	Grady	3 hr
Jul 31, 6:57 PM CDT	Special Weather Statement	OUN	Stephens	48 min
Jul 31, 3:57 PM CDT	Special Weather Statement	OUN	Baylor	33 min
Jul 31, 4:22 PM CDT	Special Weather Statement	OUN	Wichita	38 min
Jul 31, 4:44 PM CDT	Special Weather Statement	OUN	Archer	31 min
Jul 31, 4:47 PM CDT	Special Weather Statement	OUN	Clay	43 min
Jul 31, 4:58 PM CDT	Severe Thunderstorm Warning	OUN	Clay	47 min
Jul 31, 4:59 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita	46 min
Jul 31, 5:01 PM CDT	Areal Flood Advisory	OUN	Archer	3 hr
Jul 31, 5:25 PM CDT	Flash Flood Warning	OUN	Archer	3 hr
Jul 31, 5:34 PM CDT	Special Weather Statement	OUN	Clay	41 min
Jul 31, 5:46 PM CDT	Special Weather Statement	OUN	Archer, Clay	59 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015 Every severe thunderstorm warning in 2015

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.