Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

April 14, 2021Knox County, Texas

NWS Norman, OK issued this special weather statement at Apr 14, 2021, 12:41 PM CDT for Knox County, Texas. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 14, 2021, 12:41 PM CDT (17:41 UTC)
Expired: Apr 14, 2021, 1:15 PM CDT
In force: 34 min
Issued by: NWS Norman, OK

County Knox County, TX

The radar

The Dyess AFB radar (KDYX), 113 km from the middle of the area, began a volume at 17:45 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

Fort Worth, TX (KFWD), launched 12:00Z, 5.7 hours before the alert went out and 238 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 821 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 290 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 14, 10:37 AM CDT, 2 hours 4 minutes earlier.

Area forecast discussion, Apr 14, 10:37 AM CDT, 2 hours 4 minutes before

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<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>
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Hazardous weather outlook, Apr 14, 11:14 AM CDT, 1 hour 27 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1114 AM CDT Wed Apr 14 2021

OKZ004>048-050>052-TXZ083>090-151615-
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-
1114 AM CDT Wed Apr 14 2021

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

.DAY ONE...This Afternoon and Tonight...

.Thunderstorms...
Thunderstorms will increase this afternoon mainly across western
north Texas and the southern half of Oklahoma. Small hail may
occur with these storms, and a few storms could produce hail up
to quarter size near and south of the Red River. Widespread
severe storms are not expected, however.

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

.Thunderstorms...
Thunderstorm chances will continue Thursday and especially
Friday. Severe thunderstorm chances appear to be low during these
times.

.Freeze...
Freezing temperatures are possible Saturday morning and again
Sunday morning across northwest Oklahoma.

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

In the hours before

Special weather statement, Apr 14, 12:41 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1241 PM CDT Wed Apr 14 2021

TXZ087-141815-
Knox TX-
1241 PM CDT Wed Apr 14 2021

...SIGNIFICANT WEATHER ADVISORY FOR southern Knox County Until 115 PM
CDT...

AT 1236 PM CDT, a strong thunderstorm was located near O'brien,
moving northeast at 40 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...

Locations impacted include...
Munday, Knox City, Goree, Vera and Rhineland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3340 9999 3342 9999 3370 9961 3352 9947
      3345 9947 3340 9958
TIME...MOT...LOC 1736Z 235DEG 34KT 3337 9989

BRB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 7:07 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	38 min
Apr 13, 7:45 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	45 min
Apr 13, 8:38 PM CDT	Special Weather Statement	OUN	Stephens	37 min
Apr 13, 9:20 PM CDT	Special Weather Statement	OUN	Jackson	25 min
Apr 14, 5:52 PM CDT	Special Weather Statement	OUN	Love	38 min
Apr 14, 6:29 PM CDT	Special Weather Statement	OUN	Love, Marshall	31 min
Apr 13, 7:33 PM CDT	Special Weather Statement	OUN	Wilbarger	27 min
Apr 13, 7:41 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Wilbarger	22 min
Apr 13, 10:02 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Wilbarger	43 min
Apr 13, 10:44 PM CDT	Special Weather Statement	OUN	Wilbarger	31 min
Apr 14, 1:51 PM CDT	Special Weather Statement	OUN	Baylor	24 min
Apr 14, 1:56 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	24 min
Apr 14, 2:22 PM CDT	Special Weather Statement	OUN	Baylor	23 min
Apr 14, 2:51 PM CDT	Special Weather Statement	OUN	Archer	24 min
Apr 14, 3:16 PM CDT	Special Weather Statement	OUN	Archer	29 min
Apr 14, 3:49 PM CDT	Special Weather Statement	OUN	Clay	26 min
Apr 14, 5:49 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	41 min
Apr 14, 6:21 PM CDT	Special Weather Statement	OUN	Archer	24 min

Nearby

Special Weather Statements in Texas, 2021 Every special weather statement in 2021

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.