Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

July 17, 2021Knox County, Texas

NWS Norman, OK issued this special weather statement at Jul 17, 2021, 9:17 PM CDT for Knox County, Texas. It was in force for 28 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: Jul 17, 2021, 9:17 PM CDT (02:17 UTC)
Expired: Jul 17, 2021, 9:45 PM CDT
In force: 28 min
Issued by: NWS Norman, OK

County Knox County, TX

The radar

The Altus AFB radar (KFDR), 111 km from the middle of the area, began a volume at 02:20 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 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 Jul 17, 2:35 PM CDT, 6 hours 42 minutes earlier.

Area forecast discussion, Jul 17, 2:35 PM CDT, 6 hours 42 minutes before

Area Forecast Discussion
National Weather Service Norman OK
235 PM CDT Sat Jul 17 2021

...New SHORT TERM, LONG TERM...

.UPDATE...
Issued at 101 PM CDT Sat Jul 17 2021

Update to increase PoPs further south.

Deep, moist convection will continue to develop along and outflow
boundary and ahead of a remnant MCV moving out of the TX panhandle
thru this afternoon. Although deep layer shear is lacking a bit,
moderate instability and high low level theta-e will likely
contribute to a few robust updrafts developing within clusters
into at least the early evening hours. In fact, one supercell is
currently located near Okeene. The main threat will be damaging
wind gusts along this boundary into the evening, perhaps nearing
portions of the OKC metro, where DCAPE ridge will reside from
there SE along the I-44 corridor. High rainfall rates will also
accompany the storms so localized flash flooding appears a bit
more likely now. All grids have been sent.

&&

.SHORT TERM...
(This evening through Sunday)
Issued at 224 PM CDT Sat Jul 17 2021

Scattered thunderstorms will continue through the afternoon and
evening across the region. It appears that the overall intensity
should diminish after sunset, as storms lose their ground
connection (become elevated). Elevated storms are expected to
continue overnight, and into Sunday morning, when a similar
scenario to today's should redevelop. Storms may be marginally
severe again, or at least threaten to be severe, particularly
across the northern half of Oklahoma.

Temperatures will be highly dependent on precipitation this
afternoon and early evening. HRRR values, with some slight
southward geographic alterations, seemed to be the best bet for
the rest of today.

CmS
&&

.LONG TERM...
(Sunday night through next Friday)
Issued at 224 PM CDT Sat Jul 17 2021

The Sunday night/Monday/Monday night shortwave trough appears to
be on schedule, still. It will bring more organization to the
otherwise near-random pattern of convection as it passes north-
to-south across the region. In its wake, a somewhat cooler and
drier airmass is expected to cover Oklahoma, and to a lesser
extent, north Texas for a few days.

As the week progresses, a large ridge across the western part of
the country will expand into the Plains. The position of the ridge
will keep Oklahoma/north Texas in generally north to northeast
flow (aloft...mainly southerly at the surface) for several days.
During this time, temperatures will begin to creep back up, and
rain chances will dwindle to near zero...unless one or more of the
small upper-level disturbances randomly forecast by the medium
range models actually comes to fruition.

CmS
&&

.AVIATION...
(18Z TAFS)
Issued at 101 PM CDT Sat Jul 17 2021

Thunderstorms will continue to develop from near SWO to north of
CSM over the next few hours and move SE later today. Very heavy
rainfall will accompany them so expect visbys to easily drop to
3SM and may need to amend for lower. It's unclear how long this
activity will last thru tonight so possible adjustments/inclusions
of TS to SPS and LAW could be needed.

&&

.UPPER AIR...
Issued at 101 PM CDT Sat Jul 17 2021

An Upper Air flight is not planned for today.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  73  92  70  86 /  40  40  50  60
Hobart OK         72  94  71  89 /  40  20  40  50
Wichita Falls TX  75  95  74  91 /  20  20  20  50
Gage OK           70  94  68  89 /  40  30  50  40
Ponca City OK     70  87  69  84 /  30  30  60  60
Durant OK         75  94  73  90 /  20  30  30  60

&&

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

SHORT TERM...23
LONG TERM....23
AVIATION...03

Hazardous weather outlook, Jul 17, 9:05 PM CDT, 12 minutes before

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In the hours before

Special weather statement, Jul 17, 5:37 PM CDT, 3 hours 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
537 PM CDT Sat Jul 17 2021

OKZ037-TXZ086-172300-
Tillman OK-Wichita TX-
537 PM CDT Sat Jul 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Tillman and
northwestern Wichita Counties Until 600 PM CDT...

AT 529 PM CDT, a strong thunderstorm was located near Grandfield,
moving southwest at 10 MPH.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...

Locations impacted include...
Grandfield and Loveland.

LAT...LON 3399 9876 3415 9895 3420 9895 3432 9874
      3420 9861 3416 9861
TIME...MOT...LOC 2229Z 46DEG 8KT 3420 9873

WR

Special weather statement, Jul 17, 6:18 PM CDT, 2 hours 59 minutes before

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Special weather statement, Jul 17, 6:50 PM CDT, 2 hours 27 minutes before

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Special weather statement, Jul 17, 7:41 PM CDT, 1 hour 36 minutes before

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Local storm report, Jul 17, 8:08 PM CDT, 1 hour 9 minutes before

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Special weather statement, Jul 17, 9:17 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 7:12 PM CDT	Areal Flood Advisory	OUN	Cotton	3 hr
Jul 18, 2:44 PM CDT	Special Weather Statement	OUN	Woodward	46 min
Jul 18, 3:07 PM CDT	Special Weather Statement	OUN	Custer	23 min
Jul 18, 3:18 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Woodward	42 min
Jul 18, 3:28 PM CDT	Special Weather Statement	OUN	Kiowa	32 min
Jul 18, 3:57 PM CDT	Special Weather Statement	OUN	Dewey	33 min
Jul 18, 4:01 PM CDT	Special Weather Statement	OUN	Kiowa	29 min
Jul 18, 4:34 PM CDT	Severe Thunderstorm Warning	OUN	Woods	41 min
Jul 18, 4:35 PM CDT	Special Weather Statement	OUN	Custer, Dewey	25 min
Jul 18, 4:58 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa	26 min
Jul 18, 5:01 PM CDT	Special Weather Statement	OUN	Caddo	29 min
Jul 18, 5:04 PM CDT	Special Weather Statement	OUN	Caddo	26 min
Jul 18, 5:05 PM CDT	Special Weather Statement	OUN	Custer	25 min
Jul 18, 5:14 PM CDT	Special Weather Statement	OUN	Woods	31 min
Jul 18, 5:31 PM CDT	Special Weather Statement	OUN	Ellis	29 min
Jul 18, 5:34 PM CDT	Special Weather Statement	OUN	Custer	26 min
Jul 18, 5:50 PM CDT	Special Weather Statement	OUN	Woodward	25 min
Jul 18, 5:59 PM CDT	Special Weather Statement	OUN	Caddo	31 min
Jul 18, 6:02 PM CDT	Special Weather Statement	OUN	Tillman	28 min
Jul 18, 6:04 PM CDT	Special Weather Statement	OUN	Roger Mills	26 min
Jul 18, 6:08 PM CDT	Special Weather Statement	OUN	Washita	37 min
Jul 18, 6:32 PM CDT	Special Weather Statement	OUN	Washita	28 min
Jul 18, 6:39 PM CDT	Special Weather Statement	OUN	Cleveland	36 min
Jul 18, 6:42 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland	33 min
Jul 18, 6:50 PM CDT	Special Weather Statement	OUN	Grady	25 min
Jul 18, 6:52 PM CDT	Special Weather Statement	OUN	Tillman	38 min
Jul 17, 7:41 PM CDT	Special Weather Statement	OUN	Wilbarger	49 min
Jul 18, 5:19 PM CDT	Special Weather Statement	OUN	Archer	26 min
Jul 18, 5:27 PM CDT	Severe Thunderstorm Warning	OUN	Archer	33 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; radar from the NEXRAD Level II archive.