Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 281, NWS Norman, OK

May 15, 2020Cleveland County, Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 15, 2020, 12:41 PM CDT for Cleveland County, Pottawatomie County, Oklahoma. It was in force for 49 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, 2020, 12:41 PM CDT (17:41 UTC)
Expired: May 15, 2020, 1:30 PM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cleveland County, OK, Pottawatomie County, OK

The radar

The Norman radar (KTLX), 19 km from the middle of the area, began a volume at 17:41 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, 5.7 hours before the alert went out and 24 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: 1862 J/kg
Mixed-layer CIN: -241 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 292 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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, 7:03 AM CDT, 5 hours 38 minutes earlier.

Area forecast discussion, May 15, 7:03 AM CDT, 5 hours 38 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 15, 12:24 PM CDT, 17 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, 12:16 PM CDT, 25 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, 12:32 PM CDT, 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1232 PM CDT Fri May 15 2020

OKZ029-030-151800-
Pottawatomie OK-Cleveland OK-
1232 PM CDT Fri May 15 2020

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Pottawatomie and
southeastern Cleveland Counties Until 100 PM CDT...

AT 1231 PM CDT, a strong thunderstorm was located 4 miles south of
Etowah, moving east at 20 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 40 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3497 9727 3515 9728 3525 9687 3498 9683
TIME...MOT...LOC 1731Z 259DEG 18KT 3507 9719

30

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 8:10 PM CDT	Special Weather Statement	OUN	Major	35 min
May 14, 8:17 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	43 min
May 14, 8:25 PM CDT	Special Weather Statement	OUN	Ellis	35 min
May 14, 8:52 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods	68 min
May 14, 9:04 PM CDT	Special Weather Statement	OUN	Ellis	26 min
May 14, 9:10 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Woodward	50 min
May 14, 9:26 PM CDT	Special Weather Statement	OUN	Ellis	34 min
May 14, 9:41 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woodward	49 min
May 14, 9:51 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Major, Woods	54 min
May 14, 10:19 PM CDT	Areal Flood Advisory	OUN	Major	3 hr
May 14, 10:31 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Major, Woods	59 min
May 14, 11:23 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	52 min
May 15, 12:07 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Major	32 min
May 15, 1:18 AM CDT	Special Weather Statement	OUN	Garfield	27 min
May 15, 10:59 AM CDT	Flood Watch	OUN	Atoka, Bryan, Carter, Cleveland, Coal, Comanche and 17 more	16 hr
May 15, 12:16 PM CDT	Special Weather Statement	OUN	Hughes	29 min
May 15, 12:32 PM CDT	Special Weather Statement	OUN	Pottawatomie	28 min
May 15, 12:57 PM CDT	Areal Flood Advisory	OUN	Hughes, Pottawatomie, Seminole	3 hr
May 15, 1:13 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie	47 min
May 15, 1:27 PM CDT	Special Weather Statement	OUN	Cleveland	33 min
May 15, 1:38 PM CDT	Areal Flood Advisory	OUN	Cleveland, Pottawatomie	3 hr
May 15, 1:40 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	35 min
May 15, 2:15 PM CDT	Special Weather Statement	OUN	McClain	30 min
May 15, 2:20 PM CDT	Special Weather Statement	OUN	Grady	25 min
May 15, 2:21 PM CDT	Areal Flood Advisory	OUN	Cleveland, Garvin, Grady, McClain, Stephens	114 min
May 15, 2:42 PM CDT	Special Weather Statement	OUN	Garvin, Grady	33 min
May 15, 2:57 PM CDT	Severe Thunderstorm Warning	OUN	Grady	33 min
May 15, 3:07 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	23 min
May 15, 3:12 PM CDT	Areal Flood Advisory	OUN	Caddo, Comanche, Grady	63 min
May 15, 3:21 PM CDT	Special Weather Statement	OUN	Pontotoc	39 min
May 15, 3:26 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	34 min
May 15, 3:31 PM CDT	Flash Flood Warning	OUN	Caddo, Comanche, Grady, Stephens	119 min
May 15, 3:33 PM CDT	Special Weather Statement	OUN	Stephens	27 min
May 15, 3:40 PM CDT	Special Weather Statement	OUN	Jackson	50 min
May 15, 3:47 PM CDT	Special Weather Statement	OUN	Coal	43 min
May 15, 3:47 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	43 min
May 15, 3:48 PM CDT	Special Weather Statement	OUN	Garvin	27 min
May 15, 4:00 PM CDT	Special Weather Statement	OUN	Caddo	30 min
May 15, 4:07 PM CDT	Special Weather Statement	OUN	Atoka	53 min
May 15, 4:10 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady, Stephens	35 min
May 15, 4:13 PM CDT	Flash Flood Warning	OUN	Carter, Garvin, Murray, Stephens	3 hr
May 15, 4:15 PM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	11 hr
May 15, 4:17 PM CDT	Special Weather Statement	OUN	Garvin	28 min
May 15, 4:22 PM CDT	Special Weather Statement	OUN	Harmon	53 min
May 15, 4:28 PM CDT	Special Weather Statement	OUN	Kiowa	17 min
May 15, 4:28 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray	47 min
May 15, 4:43 PM CDT	Severe Thunderstorm Warning	OUN	Grady, Stephens	32 min
May 15, 4:53 PM CDT	Special Weather Statement	OUN	Comanche	37 min
May 15, 4:59 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	61 min
May 15, 5:03 PM CDT	Special Weather Statement	OUN	Bryan	42 min
May 15, 5:12 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, Stephens	33 min
May 15, 5:13 PM CDT	Special Weather Statement	OUN	Garvin	47 min
May 15, 5:16 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	44 min
May 15, 5:18 PM CDT	Special Weather Statement	OUN	Murray	72 min
May 15, 5:22 PM CDT	Special Weather Statement	OUN	Grady	23 min
May 15, 5:23 PM CDT	Areal Flood Advisory	OUN	Coal, Garvin, Murray, Pontotoc, Seminole	2 hr
May 15, 5:23 PM CDT	Special Weather Statement	OUN	Kiowa	37 min
May 15, 5:28 PM CDT	Flash Flood Warning	OUN	Caddo, Comanche, Cotton, Garvin, Grady, Stephens	92 min
May 15, 5:32 PM CDT	Areal Flood Advisory	OUN	Comanche, Jackson, Kiowa, Tillman	118 min
May 15, 5:35 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	25 min
May 15, 5:41 PM CDT	Areal Flood Advisory	OUN	Harmon, Jackson	2 hr
May 15, 5:41 PM CDT	Special Weather Statement	OUN	Caddo	34 min
May 15, 5:48 PM CDT	Special Weather Statement	OUN	Tillman	42 min
May 15, 5:52 PM CDT	Special Weather Statement	OUN	Stephens	23 min
May 15, 5:57 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	63 min
May 15, 5:58 PM CDT	Special Weather Statement	OUN	Stephens	32 min
May 15, 6:03 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	27 min
May 15, 6:04 PM CDT	Flash Flood Warning	OUN	Comanche, Jackson, Kiowa, Tillman	3 hr
May 15, 6:06 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	8 min
May 15, 6:12 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	63 min
May 15, 6:20 PM CDT	Special Weather Statement	OUN	Comanche	25 min
May 15, 6:25 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	26 min
May 15, 6:26 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	34 min
May 15, 6:35 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	40 min
May 15, 6:44 PM CDT	Flash Flood Warning	OUN	Garvin, Stephens	91 min
May 15, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Stephens	48 min
May 15, 6:58 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	77 min
May 15, 6:59 PM CDT	Flash Flood Warning	OUN	Caddo, Comanche, Grady, Tillman	3 hr
May 15, 4:48 PM CDT	Special Weather Statement	OUN	Hardeman	42 min
May 15, 5:56 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	64 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020 Every severe thunderstorm warning in 2020

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.