Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 221, NWS Norman, OK

April 29, 2017Atoka County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 29, 2017, 6:04 PM CDT for Atoka County, Oklahoma. It was in force for 26 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: Apr 29, 2017, 6:04 PM CDT (23:04 UTC)
Expired: Apr 29, 2017, 6:30 PM CDT
In force: 26 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Atoka County, OK

The radar

The Norman radar (KTLX), 155 km from the middle of the area, began a volume at 23:04 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, 11.1 hours before the alert went out and 156 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: 8 J/kg
Mixed-layer CIN: -530 J/kg
Mixed-layer LCL: 751 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

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 Apr 29, 2:56 PM CDT, 3 hours 8 minutes earlier.

Area forecast discussion, Apr 29, 2:56 PM CDT, 3 hours 8 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, Apr 29, 4:03 PM CDT, 2 hours 1 minute before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
403 PM CDT Sat Apr 29 2017

OKZ004>048-050>052-TXZ083>090-302115-
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-
403 PM CDT Sat Apr 29 2017

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...Through this evening...

.Thunderstorms...
There is a Marginal Risk of severe thunderstorms across far
southeastern Oklahoma.

Location...
The risk area is along and southeast of an Atoka to Durant line.

Timing...
Through 7 pm this evening.

Impacts...
Half dollar size hail and 60 mph.

Discussion...
Scattered showers and thunderstorms will continue to develop
across south central and southeast Oklahoma this afternoon and
evening. A few storms may produce some hail and very strong
winds. Some of the storms may produce locally heavy rainfall
which could result in some flooding.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...
Storm spotter groups and emergency management personnel across
the risk area should be ready for severe weather operations.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

.Thunderstorms...
Chances for thunderstorms will return Tuesday night through
Wednesday night across parts of Oklahoma and north Texas. Severe
storms are not anticipated.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

In the hours before

Local storm report, Apr 29, 1:08 PM CDT, 4 hours 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, Apr 29, 1:42 PM CDT, 4 hours 22 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, Apr 29, 3:40 PM CDT, 2 hours 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>

Local storm report, Apr 29, 4:03 PM CDT, 2 hours 1 minute 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, Apr 29, 4:36 PM CDT, 1 hour 28 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, Apr 29, 4:37 PM CDT, 1 hour 27 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
Apr 28, 8:43 PM CDT	Special Weather Statement	OUN	Roger Mills	32 min
Apr 28, 10:45 PM CDT	Special Weather Statement	OUN	Lincoln	30 min
Apr 28, 11:36 PM CDT	Special Weather Statement	OUN	Major	24 min
Apr 28, 11:39 PM CDT	Special Weather Statement	OUN	Canadian	36 min
Apr 28, 11:56 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher, Major	39 min
Apr 28, 11:59 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	32 min
Apr 29, 12:01 AM CDT	Special Weather Statement	OUN	Washita	29 min
Apr 29, 12:02 AM CDT	Special Weather Statement	OUN	Beckham	28 min
Apr 29, 12:15 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Washita	45 min
Apr 29, 12:17 AM CDT	Severe Thunderstorm Warning	OUN	Beckham	28 min
Apr 29, 12:24 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	16 min
Apr 29, 12:31 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	44 min
Apr 29, 12:33 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	42 min
Apr 29, 12:36 AM CDT	Special Weather Statement	OUN	Roger Mills	24 min
Apr 29, 12:59 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian	61 min
Apr 29, 1:05 AM CDT	Special Weather Statement	OUN	Dewey	25 min
Apr 29, 1:12 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Custer, Washita	63 min
Apr 29, 1:15 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	60 min
Apr 29, 1:19 AM CDT	Special Weather Statement	OUN	Kay	26 min
Apr 29, 1:20 AM CDT	Special Weather Statement	OUN	Grant	25 min
Apr 29, 1:20 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	40 min
Apr 29, 1:24 AM CDT	Areal Flood Advisory	OUN	Blaine, Caddo, Custer	3 hr
Apr 29, 1:36 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	24 min
Apr 29, 1:38 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	37 min
Apr 29, 1:49 AM CDT	Special Weather Statement	OUN	Noble	26 min
Apr 29, 1:58 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	47 min
Apr 29, 1:59 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	61 min
Apr 29, 2:02 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Logan, Noble	43 min
Apr 29, 2:07 AM CDT	Special Weather Statement	OUN	Greer	23 min
Apr 29, 2:14 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Kingfisher	61 min
Apr 29, 2:16 AM CDT	Flash Flood Warning	OUN	Blaine, Custer, Washita	6 hr
Apr 29, 2:26 AM CDT	Areal Flood Advisory	OUN	Kingfisher	3 hr
Apr 29, 2:38 AM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	67 min
Apr 29, 2:42 AM CDT	Areal Flood Advisory	OUN	Canadian	3 hr
Apr 29, 2:42 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	48 min
Apr 29, 2:43 AM CDT	Special Weather Statement	OUN	Washita	32 min
Apr 29, 2:55 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma, Payne	80 min
Apr 29, 2:58 AM CDT	Flash Flood Warning	OUN	Blaine, Caddo, Canadian, Kingfisher, Logan	6 hr
Apr 29, 2:58 AM CDT	Special Weather Statement	OUN	Oklahoma	32 min
Apr 29, 3:09 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	37 min
Apr 29, 3:14 AM CDT	Areal Flood Advisory	OUN	Garfield, Noble, Payne	3 hr
Apr 29, 3:16 AM CDT	Special Weather Statement	OUN	Beckham	29 min
Apr 29, 3:22 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	38 min
Apr 29, 3:33 AM CDT	Special Weather Statement	OUN	Logan, Oklahoma	27 min
Apr 29, 3:55 AM CDT	Areal Flood Advisory	OUN	Beckham, Greer, Harmon, Jackson, Kiowa	3 hr
Apr 29, 3:56 AM CDT	Special Weather Statement	OUN	Washita	34 min
Apr 29, 3:58 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	47 min
Apr 29, 4:04 AM CDT	Special Weather Statement	OUN	Beckham, Greer, Harmon, Jackson	26 min
Apr 29, 4:16 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Custer, Jackson, Kiowa, Washita	44 min
Apr 29, 4:19 AM CDT	Areal Flood Advisory	OUN	Logan, Oklahoma	3 hr
Apr 29, 4:35 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	40 min
Apr 29, 4:40 AM CDT	Special Weather Statement	OUN	Blaine	35 min
Apr 29, 4:47 AM CDT	Special Weather Statement	OUN	Payne	28 min
Apr 29, 4:56 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	49 min
Apr 29, 4:58 AM CDT	Special Weather Statement	OUN	Comanche, Cotton	32 min
Apr 29, 5:05 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Kingfisher	40 min
Apr 29, 5:06 AM CDT	Flash Flood Warning	OUN	Logan, Noble, Payne	6 hr
Apr 29, 5:44 AM CDT	Special Weather Statement	OUN	Jackson	31 min
Apr 29, 5:45 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	45 min
Apr 29, 6:03 AM CDT	Areal Flood Advisory	OUN	Oklahoma	3 hr
Apr 29, 6:47 AM CDT	Areal Flood Advisory	OUN	Kiowa	3 hr
Apr 29, 7:13 AM CDT	Areal Flood Advisory	OUN	Greer, Harmon, Jackson	3 hr
Apr 29, 7:25 AM CDT	Areal Flood Advisory	OUN	Logan, Oklahoma	3 hr
Apr 29, 7:47 AM CDT	Flash Flood Warning	OUN	Custer, Kiowa, Washita	3 hr
Apr 29, 8:19 AM CDT	River Flood Warning	OUN	Blaine, Caddo, Canadian, Custer	49 hr
Apr 29, 8:24 AM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	17 hr
Apr 29, 8:26 AM CDT	River Flood Warning	OUN	Blaine, Canadian	20 hr
Apr 29, 8:52 AM CDT	Flash Flood Warning	OUN	Beckham, Blaine, Custer, Dewey, Greer, Kiowa and 1 more	4 hr
Apr 29, 9:13 AM CDT	Flash Flood Warning	OUN	Blaine, Caddo, Canadian, Kingfisher, Logan	4 hr
Apr 29, 9:21 AM CDT	River Flood Warning	OUN	Payne	64 hr
Apr 29, 11:23 AM CDT	River Flood Warning	OUN	Kingfisher	25 hr
Apr 29, 11:29 AM CDT	River Flood Warning	OUN	Kingfisher	15 hr
Apr 29, 11:34 AM CDT	Areal Flood Warning	OUN	Logan, Oklahoma	3 hr
Apr 29, 11:42 AM CDT	Areal Flood Warning	OUN	Logan, Noble, Payne	3 hr
Apr 29, 1:23 PM CDT	Areal Flood Warning	OUN	Blaine, Caddo, Canadian, Custer, Garfield, Kingfisher and 3 more	3 hr
Apr 29, 1:42 PM CDT	Special Weather Statement	OUN	Canadian	33 min
Apr 29, 2:08 PM CDT	River Flood Warning	OUN	Canadian, Cleveland, Grady, McClain	51 hr
Apr 29, 2:08 PM CDT	River Flood Warning	OUN	Cleveland, McClain	55 hr
Apr 29, 2:26 PM CDT	River Flood Warning	OUN	Kingfisher, Logan	45 hr
Apr 29, 2:27 PM CDT	River Flood Warning	OUN	Logan, Payne	40 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2017 Every severe thunderstorm warning in 2017

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.