Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

January 24, 2021Knox County, Texas

NWS Norman, OK issued this special weather statement at Jan 24, 2021, 11:38 PM CST for Knox County, Texas. It was in force for 37 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: Jan 24, 2021, 11:38 PM CST (05:38 UTC)
Expired: Jan 25, 2021, 12:15 AM CST
In force: 37 min
Issued by: NWS Norman, OK

County Knox County, TX

The radar

The Altus AFB radar (KFDR), 95 km from the middle of the area, began a volume at 05:38 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, 5.6 hours before the alert went out and 236 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: 164 J/kg
Mixed-layer CIN: -182 J/kg
Mixed-layer LCL: 440 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 323 m²/s²
0-3 km storm-relative helicity: 341 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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 Jan 24, 11:26 PM CST, 12 minutes earlier.

Area forecast discussion, Jan 24, 11:26 PM CST, 12 minutes before

Area Forecast Discussion
National Weather Service Norman OK
1126 PM CST Sun Jan 24 2021

...New AVIATION...

.SHORT TERM...
(This evening through Monday)
Issued at 133 PM CST Sun Jan 24 2021

At the time of this writing the cold front has advanced and
stalled just past the I-44 corridor with temperatures holding in
the upper 30s and 40s behind the front, and climbing into the 50s
and 60s in the warm moist flow ahead of the front.

Late this afternoon into the evening, scattered showers and storms
will begin moving up from the south, gradually increasing in
coverage. Modest instability combined with strong shear will support
a few strong to severe storms late evening, mainly in the
warm sector southeast of I-44. QPF will be enhanced along the stalled
surface front (mainly along and just southeast of the I-44
corridor) with storm totals of 1 to 2 inches expected.

Later overnight, the upper low will move in toward the panhandles
triggering a second round of storms along the low level front
(around 850mb). This line will race eastward into Monday morning.
With more upper level support and better organized convection, the
severe risk will continue with this second round of storms.

Models continue show temperatures in the 30 to 34 degree
Fahrenheit range over northwest Oklahoma. Our forecast will be to
keep temperatures just on the warm side of freezing (supported by
most of the raw model guidance), but mention a low chance for
wintry mix. Widespread precipitation will result in efficient
wetbulbing overnight, but dewpoints are expected to be high enough
to keep temperatures just above freezing.

Will continue to follow the NAM for frontal position and post-
frontal temps today, tonight, and tomorrow due to its history with
anafronts. Expect the front to gradually lift up to northern
Oklahoma tomorrow (allowing warmer temperatures to return to
southern Oklahoma and north Texas) before another front comes
sweeping through tomorrow night.

Day

&&

.LONG TERM...
(Monday night through next Saturday)
Issued at 133 PM CST Sun Jan 24 2021

With the next front coming down Monday night, we will see a
reinforcement of cold air.

Another system will move through late Tuesday / early Wednesday
bringing another chance at wintry mix (though moisture will be
limited).

Ridging will build in Thursday and Friday allowing temperatures to
warm, followed by another system with accompanying precipitation
chances this weekend.

Day

&&

.AVIATION...
(06Z TAFS)
Issued at 1126 PM CST Sun Jan 24 2021

Poor flying conditions are expected overnight with periods of rain
and scattered thunderstorms. Visibility reduction briefly to
around or below a mile in the strongest storms, along with small
hail, will be possible. Otherwise low ceilings will persist
through at least mid-morning, and linger even longer at northern
TAF sites. Then, stronger westerly or northwesterly winds are
expected with a return to VFR conditions.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  50  41  56  27 /  30 100  10   0
Hobart OK         49  34  58  27 /  30  90   0   0
Wichita Falls TX  62  44  64  32 /  50 100   0   0
Gage OK           41  33  41  20 /  10  90  10   0
Ponca City OK     46  40  41  24 /  20 100  20   0
Durant OK         59  53  66  35 /  50  90  20   0

&&

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

SHORT TERM...14
LONG TERM....14
AVIATION...12

Hazardous weather outlook, Jan 24, 12:43 PM CST, 10 hours 55 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1243 PM CST Sun Jan 24 2021

OKZ004>048-050>052-TXZ083>090-251845-
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-
1243 PM CST Sun Jan 24 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...
A few severe storms will be possible late today through tonight
across parts of southern Oklahoma and north Texas. There is a
slight risk across portions of north Texas and most of southern
Oklahoma. Hail to the size of half dollars and wind gusts
exceeding 60 mph will be the main threats. A few strong storms may
also occur in central and western Oklahoma, capable of producing
small hail and gusty winds. The threat of severe weather will end
around 4 AM.

.Winter Weather...
Light freezing rain will be possible late tonight across northwest
Oklahoma. A glaze of ice may occur on some elevated surfaces by
Monday morning.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across
southern Oklahoma and western north Texas should prepare for
severe weather operations late Sunday evening through Monday
morning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

.Winter Weather...
Light wintry precipitation may continue Monday morning across far
northwest Oklahoma. Light wintry precipitation is possible
Tuesday in far northwest Oklahoma and then again Tuesday night
into Wednesday across northern and parts of central Oklahoma. Very
little ice and snow accumulations are expected.

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, Jan 24, 10:10 PM CST, 1 hour 28 minutes before

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Special weather statement, Jan 24, 10:28 PM CST, 1 hour 10 minutes before

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Special weather statement, Jan 24, 10:56 PM CST, 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1056 PM CST Sun Jan 24 2021

OKZ017-018-250530-
Kingfisher OK-Blaine OK-
1056 PM CST Sun Jan 24 2021

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Kingfisher and
eastern Blaine Counties Until 1130 PM CST...

AT 1052 PM CST, a strong thunderstorm was located 4 miles north of
Greenfield, moving northeast at 60 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...

Locations impacted include...
Watonga, Hitchcock, Greenfield, Loyal, Omega and Lacey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3612 9806 3600 9799 3566 9838 3573 9853
      3613 9827
TIME...MOT...LOC 0452Z 215DEG 52KT 3579 9835

Mahale

Special weather statement, Jan 24, 11:13 PM CST, 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1113 PM CST Sun Jan 24 2021

TXZ087-250545-
Knox TX-
1113 PM CST Sun Jan 24 2021

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Knox County Until
1145 PM CST...

AT 1112 PM CST, a strong thunderstorm was located 11 miles west of
O'brien, moving northeast at 60 MPH.

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

Locations impacted include...
Knox City and Benjamin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3340 9999 3365 9999 3373 9986 3373 9969
      3363 9962 3340 9982
TIME...MOT...LOC 0512Z 222DEG 53KT 3338 10005

Mahale

Special weather statement, Jan 24, 11:38 PM CST, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1138 PM CST Sun Jan 24 2021

TXZ084-085-087-088-250615-
Foard TX-Knox TX-Wilbarger TX-Baylor TX-
1138 PM CST Sun Jan 24 2021

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Foard...central
Knox...southwestern Wilbarger and northwestern Baylor Counties Until
1215 AM CST...

AT 1134 PM CST, a strong thunderstorm was located 5 miles northwest
of Rhineland, moving northeast at 60 MPH.

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

Locations impacted include...
Benjamin, Gilliland, Vera and Rhineland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3345 9972 3354 9990 3393 9963 3391 9941
      3382 9928
TIME...MOT...LOC 0534Z 224DEG 54KT 3360 9970

Mahale

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 24, 10:10 PM CST	Special Weather Statement	OUN	Washita	35 min
Jan 24, 10:28 PM CST	Special Weather Statement	OUN	Blaine	32 min
Jan 24, 10:56 PM CST	Special Weather Statement	OUN	Blaine	34 min
Jan 24, 11:41 PM CST	Special Weather Statement	OUN	Washita	34 min
Jan 25, 12:09 AM CST	Severe Thunderstorm Warning	OUN	Tillman	51 min
Jan 25, 12:31 AM CST	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	44 min
Jan 25, 12:38 AM CST	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens	37 min
Jan 25, 1:01 AM CST	Severe Thunderstorm Warning	OUN	Carter, Comanche, Cotton, Garvin, Grady, Jefferson and 1 more	44 min
Jan 25, 1:43 AM CST	Special Weather Statement	OUN	Carter, Garvin, Murray	32 min
Jan 25, 2:26 AM CST	Special Weather Statement	OUN	Hughes, Murray, Pontotoc, Seminole	49 min
Jan 25, 3:39 AM CST	Special Weather Statement	OUN	Coal, Johnston, Marshall	51 min
Jan 25, 4:51 AM CST	Special Weather Statement	OUN	Atoka, Bryan	39 min
Jan 25, 4:58 AM CST	Severe Thunderstorm Warning	OUN	Atoka, Bryan	47 min
Jan 24, 11:13 PM CST	Special Weather Statement	OUN	Knox	32 min
Jan 24, 11:55 PM CST	Special Weather Statement	OUN	Baylor	35 min
Jan 25, 1:38 AM CST	Special Weather Statement	OUN	Wilbarger	37 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.