Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 31, NWS Norman, OK

March 19, 2020Comanche County, Cotton County, Tillman County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 19, 2020, 2:37 AM CDT for Comanche County, Cotton County, Tillman County, Oklahoma. It was in force for 53 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: Mar 19, 2020, 2:37 AM CDT (07:37 UTC)
Expired: Mar 19, 2020, 3:30 AM CDT
In force: 53 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Comanche County, OK, Cotton County, OK, Tillman County, OK

The radar

The Altus AFB radar (KFDR), 37 km from the middle of the area, began a volume at 07:36 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, 7.6 hours before the alert went out and 139 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: 1121 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1110 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.4

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 Mar 19, 12:34 AM CDT, 2 hours 3 minutes earlier.

Area forecast discussion, Mar 19, 12:34 AM CDT, 2 hours 3 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, Mar 18, 3:07 PM CDT, 11 hours 30 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
307 PM CDT Wed Mar 18 2020

OKZ004>048-050>052-TXZ083>090-192015-
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-
307 PM CDT Wed Mar 18 2020

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

.DAY ONE...Through Tonight...

.Thunderstorms...
There is an Enhanced risk for severe storms across portions of
central and southern Oklahoma and all of western north Texas.
There is a Slight risk across much of the rest of central and
northern Oklahoma.

Location...
The Enhanced risk is south and west of a line from Mangum and
Hobart, to Mustang and Shawnee, to Ada and Madill Oklahoma. The
Slight risk area is south of a line from Gage and Woodward, to
Cherokee and Newkirk Oklahoma, with a Marginal risk across the
rest of the area.

Timing...
The most likely time will be through early Thursday.

Impacts...
Hail up to the size of baseballs.
Damaging wind gusts of 60 to 80 mph.
A few tornadoes could also be possible.

Discussion...
Discrete storms could develop late this afternoon and this
evening, initially affecting portions of southern Oklahoma and
north Texas. These storms along with storms that develop west and
southwest of the area are expected to eventually develop into one
or more lines that moves across the area overnight into early
Thursday. All severe hazards will be possible with the potential
for damaging wind gusts increasing with the development of the
line of storms overnight. The risk for tornadoes will also
continue overnight into early Thursday.

.Flooding...
Heavy rainfall will be possible this evening and overnight. Areas
of southern Oklahoma and western north Texas that had heavy
rainfall Tuesday night and early Wednesday will be especially
susceptible to flooding. The highest potential for flooding will
be in portions of southeast and south central Oklahoma.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across
Oklahoma and north Texas should prepare for severe weather
operations into early Thursday.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

.Thunderstorms...
Strong to severe storms will likely be ongoing early Thursday
over central and eastern Oklahoma. Damaging winds will be the main
threat with these storms. The storms are expected to move into
far eastern Oklahoma by late afternoon.

.Flooding...
Heavy rainfall that could lead to flooding will continue to be a
concern Thursday, especially in portions of southeast and south
central Oklahoma.

.Winds...
Strong southwest winds are expected Thursday, especially in the
afternoon, across western and northern Oklahoma. Winds may gust to
near 50 mph at times.

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, Mar 18, 9:20 PM CDT, 5 hours 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
920 PM CDT WED MAR 18 2020

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

0910 PM     FLASH FLOOD      ALTUS                   34.65N 99.31W
03/18/2020                   JACKSON            OK   LAW ENFORCEMENT

            NUMEROUS LOCATIONS REPORTED TO HAVE WATER FLOWING OVER
            ROADWAYS, PARTICULARLY ON SOME CITY STREETS IN ALTUS.

&&

TLINDLEY

Local storm report, Mar 18, 10:03 PM CDT, 4 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1003 PM CDT WED MAR 18 2020

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

0945 PM     FLASH FLOOD      3 W ALTUS               34.65N 99.37W
03/18/2020                   JACKSON            OK   EMERGENCY MNGR

            FLOOD WATERS FLOWING OVER HWY 62 WEST OF ALTUS.

&&

TLINDLEY

Special weather statement, Mar 19, 1:04 AM CDT, 1 hour 33 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, Mar 19, 1:14 AM CDT, 1 hour 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, Mar 19, 1:24 AM CDT, 1 hour 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>

Special weather statement, Mar 19, 2:30 AM CDT, 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 18, 7:03 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa	42 min
Mar 18, 7:19 PM CDT	River Flood Warning	OUN	Cotton	69 hr
Mar 18, 7:33 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	29 min
Mar 18, 7:38 PM CDT	Special Weather Statement	OUN	Jackson	37 min
Mar 18, 7:45 PM CDT	Areal Flood Advisory	OUN	Harmon, Jackson	2 hr
Mar 18, 8:01 PM CDT	Special Weather Statement	OUN	Tillman	29 min
Mar 18, 8:12 PM CDT	Special Weather Statement	OUN	Oklahoma	33 min
Mar 18, 8:20 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa	40 min
Mar 18, 8:39 PM CDT	Flash Flood Warning	OUN	Jackson, Kiowa	2 hr
Mar 18, 8:40 PM CDT	Special Weather Statement	OUN	Oklahoma	35 min
Mar 18, 8:46 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa	44 min
Mar 18, 9:48 PM CDT	Areal Flood Advisory	OUN	Caddo, Kiowa, Washita	117 min
Mar 18, 10:47 PM CDT	Severe Thunderstorm Warning	OUN	Love	43 min
Mar 18, 11:06 PM CDT	Tornado Warning	OUN	Love	24 min
Mar 18, 11:16 PM CDT	Areal Flood Advisory	OUN	Canadian, Grady, Oklahoma	3 hr
Mar 18, 11:29 PM CDT	Tornado Warning	OUN	Love, Marshall	46 min
Mar 18, 11:44 PM CDT	Areal Flood Advisory	OUN	Caddo, Kiowa, Washita	2 hr
Mar 19, 12:02 AM CDT	Areal Flood Advisory	OUN	Oklahoma	3 hr
Mar 19, 12:32 AM CDT	Flash Flood Warning	OUN	Canadian, Oklahoma	5 hr
Mar 19, 1:04 AM CDT	Special Weather Statement	OUN	Lincoln	26 min
Mar 19, 1:45 AM CDT	Areal Flood Advisory	OUN	Lincoln, Payne	3 hr
Mar 19, 2:08 AM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Johnston	3 hr
Mar 19, 2:30 AM CDT	Special Weather Statement	OUN	Comanche, Tillman	30 min
Mar 19, 2:46 AM CDT	Areal Flood Advisory	OUN	Caddo, Comanche, Kiowa	3 hr
Mar 19, 2:53 AM CDT	Special Weather Statement	OUN	Cleveland, Pottawatomie	37 min
Mar 19, 3:09 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Stephens	51 min
Mar 19, 3:31 AM CDT	Special Weather Statement	OUN	Jefferson	29 min
Mar 19, 3:42 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	48 min
Mar 19, 3:50 AM CDT	Special Weather Statement	OUN	Garvin, Stephens	25 min
Mar 19, 4:19 AM CDT	Special Weather Statement	OUN	Garvin, Murray, Pontotoc, Pottawatomie	26 min
Mar 19, 4:21 AM CDT	Special Weather Statement	OUN	Lincoln	24 min
Mar 19, 4:33 AM CDT	River Flood Warning	OUN	Jackson, Kiowa, Tillman	3 hr
Mar 19, 4:44 AM CDT	Special Weather Statement	OUN	Pontotoc	31 min
Mar 19, 5:08 AM CDT	Special Weather Statement	OUN	Marshall	37 min
Mar 19, 5:30 AM CDT	Areal Flood Advisory	OUN	Atoka, Bryan, Coal, Johnston, Marshall	3 hr
Mar 19, 5:30 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	45 min
Mar 19, 6:06 AM CDT	Special Weather Statement	OUN	Cotton	24 min
Mar 19, 6:21 AM CDT	Special Weather Statement	OUN	Garvin	24 min
Mar 19, 6:37 AM CDT	Areal Flood Advisory	OUN	Cotton, Garvin, Stephens	3 hr
Mar 19, 7:32 AM CDT	Special Weather Statement	OUN	Tillman	28 min
Mar 19, 7:40 AM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	19 hr
Mar 19, 7:41 AM CDT	Areal Flood Advisory	OUN	Garvin, McClain, Pontotoc, Pottawatomie, Seminole	3 hr
Mar 19, 8:16 AM CDT	Special Weather Statement	OUN	Cotton	29 min
Mar 19, 8:21 AM CDT	Flash Flood Warning	OUN	Comanche, Cotton	3 hr
Mar 19, 8:29 AM CDT	Flash Flood Warning	OUN	Stephens	3 hr
Mar 19, 8:37 AM CDT	Special Weather Statement	OUN	McClain	23 min
Mar 19, 8:43 AM CDT	River Flood Warning	OUN	Lincoln, Oklahoma, Pottawatomie	12 hr
Mar 19, 8:48 AM CDT	Areal Flood Advisory	OUN	Cleveland, Garvin, Grady, McClain	3 hr
Mar 19, 8:58 AM CDT	Special Weather Statement	OUN	Cleveland, McClain, Pottawatomie	32 min
Mar 19, 9:03 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie, Seminole	42 min
Mar 19, 9:12 AM CDT	Flash Flood Warning	OUN	Cleveland, Garvin, McClain	2 hr
Mar 19, 9:19 AM CDT	River Flood Warning	OUN	Comanche, Cotton	41 hr
Mar 19, 9:28 AM CDT	Areal Flood Advisory	OUN	Pottawatomie	3 hr
Mar 19, 9:45 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	33 min
Mar 19, 10:56 AM CDT	Areal Flood Warning	OUN	Comanche, Cotton	6 hr
Mar 19, 11:24 AM CDT	Areal Flood Warning	OUN	Cleveland, Garvin, McClain	6 hr
Mar 19, 11:33 AM CDT	Areal Flood Warning	OUN	Stephens	5 hr
Mar 19, 1:08 PM CDT	Special Weather Statement	OUN	Murray	37 min
Mar 19, 2:09 PM CDT	Special Weather Statement	OUN	Hughes	36 min
Mar 19, 2:14 PM CDT	River Flood Warning	OUN	Carter, Garvin, Murray	6 hr
Mar 19, 2:15 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	30 min
Mar 19, 2:27 PM CDT	Special Weather Statement	OUN	Murray	33 min
Mar 19, 4:08 PM CDT	Special Weather Statement	OUN	Atoka	37 min
Mar 19, 5:13 PM CDT	Special Weather Statement	OUN	Bryan	32 min
Mar 18, 7:15 PM CDT	Special Weather Statement	OUN	Baylor	30 min
Mar 18, 7:30 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wilbarger	45 min
Mar 18, 8:03 PM CDT	Severe Thunderstorm Warning	OUN	Foard	42 min
Mar 18, 8:05 PM CDT	Special Weather Statement	OUN	Wilbarger	25 min
Mar 18, 9:08 PM CDT	Special Weather Statement	OUN	Archer	37 min
Mar 19, 1:24 AM CDT	Special Weather Statement	OUN	Wilbarger	36 min
Mar 19, 4:38 AM CDT	Special Weather Statement	OUN	Baylor	37 min
Mar 19, 5:12 AM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wilbarger	33 min
Mar 19, 7:07 AM CDT	Special Weather Statement	OUN	Wilbarger	23 min
Mar 19, 10:24 AM CDT	Special Weather Statement	OUN	Wichita	36 min
Mar 19, 10:59 AM CDT	Special Weather Statement	OUN	Clay	31 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.