Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 162, NWS Norman, OK

May 15, 2018Greer County, Kiowa County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 15, 2018, 10:39 PM CDT for Greer County, Kiowa County, Oklahoma. It was in force for 36 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 15, 2018, 10:39 PM CDT (03:39 UTC)
Expired: May 15, 2018, 11:15 PM CDT
In force: 36 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Greer County, OK, Kiowa County, OK

The radar

The Altus AFB radar (KFDR), 68 km from the middle of the area, began a volume at 03:40 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, 3.7 hours before the alert went out and 173 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: 82 J/kg
Mixed-layer CIN: -390 J/kg
Mixed-layer LCL: 1731 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 156 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 May 15, 10:34 PM CDT, 5 minutes earlier.

Area forecast discussion, May 15, 10:34 PM CDT, 5 minutes before

Area Forecast Discussion
National Weather Service Norman OK
1034 PM CDT Tue May 15 2018

.AVIATION...
06Z TAFs - Showers and thunderstorms will be possible across parts
of the area overnight into Wednesday. Strong variable winds
possible near storms. Winds will generally be from the E and SE
but could shift for a brief period due to outflow boundaries. VFR
ceilings expected with this TAF period. However, ceilings may be
near MVFR in a few places. Will continue to monitor radar/obs and
make any last minute changes before sending.

&&

.PREV DISCUSSION... /issued 750 PM CDT Tue May 15 2018/

DISCUSSION...
Models indicate that thunderstorms moving across the western and
central TX panhandle will arrive into at least southwestern OK and
adjacent parts of northern TX late this evening. This is in
addition to the ongoing isolated storms now over this part of
northern TX. The moist upslope flow in the boundary layer and
remaining insolation and a weak mid-level wave are expected to
keep these storms going until midnight or beyond. A damaging wind
threat is possible in southwestern OK and adjacent parts of
northern TX. Very heavy rainfall is likely in some areas. POPS
have been increased in these areas.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  66  83  64  86 /  20  30  20  10
Hobart OK         64  86  65  88 /  50  30  20  10
Wichita Falls TX  67  86  67  90 /  50  30  20  10
Gage OK           62  83  62  87 /  40  30  20  20
Ponca City OK     62  83  63  86 /  20  30  20  10
Durant OK         67  84  66  87 /  30  30  20  10

&&

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

09/25/01

Hazardous weather outlook, May 15, 8:32 PM CDT, 2 hours 7 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, May 15, 9:32 PM CDT, 1 hour 7 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 15, 9:47 PM CDT, 52 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 15, 10:13 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, May 15, 10:16 PM CDT, 23 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 15, 10:28 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>

Special weather statement, May 15, 10:30 PM CDT, 9 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 15, 9:47 PM CDT	Special Weather Statement	OUN	Roger Mills	28 min
May 15, 10:16 PM CDT	Special Weather Statement	OUN	Greer	14 min
May 15, 10:23 PM CDT	Areal Flood Advisory	OUN	Harmon	3 hr
May 15, 10:28 PM CDT	Special Weather Statement	OUN	Harmon	17 min
May 15, 10:49 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	41 min
May 15, 10:57 PM CDT	Areal Flood Advisory	OUN	Jackson	3 hr
May 15, 11:06 PM CDT	Special Weather Statement	OUN	Grady	24 min
May 15, 11:10 PM CDT	Special Weather Statement	OUN	Washita	20 min
May 15, 11:15 PM CDT	Severe Thunderstorm Warning	OUN	Washita	30 min
May 15, 11:31 PM CDT	Special Weather Statement	OUN	Grady	29 min
May 15, 11:32 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	43 min
May 15, 11:47 PM CDT	Areal Flood Advisory	OUN	Kiowa	3 hr
May 15, 11:54 PM CDT	Special Weather Statement	OUN	Roger Mills	36 min
May 15, 11:56 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	28 min
May 16, 12:05 AM CDT	Special Weather Statement	OUN	Comanche	25 min
May 16, 12:14 AM CDT	Special Weather Statement	OUN	Tillman	31 min
May 16, 12:29 AM CDT	Special Weather Statement	OUN	Beckham, Roger Mills	31 min
May 16, 12:31 AM CDT	Special Weather Statement	OUN	Comanche	29 min
May 16, 2:26 AM CDT	Special Weather Statement	OUN	Oklahoma	19 min
May 16, 2:43 AM CDT	Areal Flood Advisory	OUN	Oklahoma	2 hr
May 16, 5:00 AM CDT	Areal Flood Advisory	OUN	Garfield	2 hr
May 16, 4:49 PM CDT	Special Weather Statement	OUN	Kay	26 min
May 16, 5:05 PM CDT	Special Weather Statement	OUN	Kay	25 min
May 16, 5:20 PM CDT	Special Weather Statement	OUN	Noble	25 min
May 16, 5:49 PM CDT	Special Weather Statement	OUN	Noble	26 min
May 15, 7:04 PM CDT	Special Weather Statement	OUN	Baylor, Knox	26 min
May 15, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	43 min
May 15, 8:17 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	43 min
May 15, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	50 min
May 15, 8:59 PM CDT	Areal Flood Advisory	OUN	Baylor, Knox	2 hr
May 15, 9:32 PM CDT	Special Weather Statement	OUN	Foard	28 min
May 15, 10:13 PM CDT	Special Weather Statement	OUN	Wilbarger	17 min
May 15, 10:30 PM CDT	Special Weather Statement	OUN	Hardeman	30 min
May 15, 11:43 PM CDT	Special Weather Statement	OUN	Baylor, Wilbarger	32 min
May 16, 12:11 AM CDT	Special Weather Statement	OUN	Clay	34 min
May 16, 12:18 AM CDT	Special Weather Statement	OUN	Archer, Baylor, Wichita	27 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018 Every severe thunderstorm warning in 2018

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.