Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

May 18, 2021Foard County, Hardeman County, Knox County, Texas

NWS Norman, OK issued this special weather statement at May 18, 2021, 11:11 PM CDT for Foard County, Hardeman County, Knox County, Texas. It was in force for 64 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
May 18, 2021, 11:11 PM CDT (04:11 UTC)
Expired
May 19, 2021, 12:15 AM CDT
In force
64 min
Issued by
NWS Norman, OK

Counties Foard County, TX, Hardeman County, TX, Knox County, TX

The radar

The Altus AFB radar (KFDR), 90 km from the middle of the area, began a volume at 04:13 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 00:00Z, 4.2 hours before the alert went out and 282 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-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2021-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 190 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2021-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
190 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
887 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
196 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 May 18, 7:55 PM CDT, 3 hours 16 minutes earlier.

Area forecast discussion, May 18, 7:55 PM CDT, 3 hours 16 minutes before
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</head>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Hazardous weather outlook, May 18, 8:02 PM CDT, 3 hours 9 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
802 PM CDT Tue May 18 2021

OKZ004>048-050>052-TXZ083>090-200115-
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-
802 PM CDT Tue May 18 2021

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

.DAY ONE...Overnight...

.Thunderstorms...
A few strong or marginally severe storms may occur overnight
across far western sections of Oklahoma and north Texas, where
storms could produce hail up to the size of quarters and wind
gusts of 60 mph. Isolated strong or marginally severe storms will
also be possible in southeastern Oklahoma where hail up to the
size of quarters will be the main threat.

.Heavy Rainfall...
Localized heavy rainfall and flooding will be possible overnight,
mainly across southeastern Oklahoma.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

.Thunderstorms...
Thunderstorm chances will continue through Saturday. Strong to
severe storms will be possible across western Oklahoma and
western north Texas Wednesday afternoon and evening.

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, May 18, 10:30 PM CDT, 41 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1030 PM CDT Tue May 18 2021

TXZ083-084-190415-
Foard TX-Hardeman TX-
1030 PM CDT Tue May 18 2021

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Foard and
southwestern Hardeman Counties Until 1115 PM CDT...

AT 1028 PM CDT, strong thunderstorms were along a line extending from
7 miles west of Swearingen to 4 miles east of Paducah, moving
northeast at 25 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3423 10005 3424 10003 3424 10001 3423 10000
      3440 10000 3446 9987 3405 9974 3396 10005
TIME...MOT...LOC 0328Z 242DEG 22KT 3413 10028 3400 10023

JT
Special weather statement, May 18, 11:11 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1111 PM CDT Tue May 18 2021

OKZ033-034-036-TXZ083-084-087-190515-
Harmon OK-Greer OK-Jackson OK-Foard TX-Knox TX-Hardeman TX-
1111 PM CDT Tue May 18 2021

...SIGNIFICANT WEATHER ADVISORY FOR southern Harmon...south central
Greer...southwestern Jackson...Foard...Knox and Hardeman Counties
Until 1215 AM CDT...

AT 1109 PM CDT, strong thunderstorms were along a line extending from
8 miles southwest of Hollis to 4 miles southwest of Goodlett to 12
miles east of Swearingen to 10 miles southwest of Truscott, moving
east at 30 MPH.

HAZARDS INCLUDE...
Wind gusts over 50 MPH...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...

Locations impacted include...
Quanah, Hollis, Crowell, Benjamin, Chillicothe, Eldorado, Gould,
Thalia, Duke, Gilliland, Margaret, Goodlett, Vera, Medicine Mound,
Truscott, McQueen, Lazare, Rayland and Copper Breaks State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Severe weather is not expected and no warnings are anticipated at
this time.

&&

LAT...LON 3423 10005 3424 10001 3423 10000 3469 10000
      3477 9949 3354 9947 3353 9999 3383 10000
      3384 10005
TIME...MOT...LOC 0409Z 249DEG 27KT 3459 9999 3429 9994 3413 9993 3369
9998

03

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 11:50 PM CDTSpecial Weather StatementOUNHarmon, Jackson40 min
May 19, 12:25 AM CDTSpecial Weather StatementOUNJackson35 min
May 19, 12:39 AM CDTSpecial Weather StatementOUNCoal36 min
May 19, 1:07 AM CDTSpecial Weather StatementOUNGreer23 min
May 18, 10:30 PM CDTSpecial Weather StatementOUNHardeman45 min
May 18, 11:48 PM CDTSpecial Weather StatementOUNBaylor, Wilbarger42 min

Nearby

Special Weather Statements in Texas, 2021Every 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.