Severe Thunderstorm Warning 721, NWS Norman, OK

574 
WWUS54 KOUN 120403
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1103 PM CDT Fri Aug 11 2023

OKC017-027-120413-
/O.CAN.KOUN.SV.W.0721.000000T0000Z-230812T0415Z/
Cleveland OK-Canadian OK-
1103 PM CDT Fri Aug 11 2023

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CLEVELAND AND
SOUTHEASTERN CANADIAN COUNTIES IS CANCELLED...
                 
The storm which prompted the warning has weakened below severe
limits, therefore the warning has been cancelled.  However, gusty
winds are still possible with this thunderstorm.

LAT...LON 3529 9750 3531 9763 3534 9767 3532 9770
      3532 9774 3534 9776 3534 9778 3539 9776
      3538 9767 3538 9759 3537 9749
TIME...MOT...LOC 0359Z 264DEG 16KT 3536 9764 

$$

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Area Forecast Discussion
National Weather Service Norman OK
556 PM CDT Fri Aug 11 2023

...New AVIATION...

.SHORT TERM...
(This evening through Saturday)
Issued at 257 PM CDT Fri Aug 11 2023

The combination of extreme heat, active fire weather, and severe
potential continues across our area this evening and tomorrow. Heat
indices are clearing well into the 110s across a wide swath of our
area this afternoon, and dangerous heat conditions will persist
until this evening.

Cumulus clouds are slowly developing in the central Texas panhandle
as a pseudo-dryline mixes eastward. These may provide the impetus
for convective development across southwest Oklahoma by 5:00 p.m.
Other chances at storm development will occur this evening in
western north Texas along the dryline, and near a slowly lifting
warm front in northwest Oklahoma. The latest HRRR is only weakly
hinting at storm development, but CAMs have generally been
underconvective this week. MLCAPE values barely over 1,000 J/kg will
be markedly lower than last night, so storm longevity especially
after sunset is in question. However, DCAPE values are as high as
they have been all week - in the 1,600-2,000 J/kg range, driven by
hot, well-mixed boundary layers and dry mid-levels. Damaging wind
gusts up to 70 mph are possible with the strongest cores, as well as
lightning which will likely aid in new fire ignitions in western
north Texas.

After another uncomfortably warm overnight (most areas will fail to
get below 75), we get to run it all back tomorrow for the first day
of the weekend. Storm chances will continue tonight across much of
the area, but particularly northern and central Oklahoma. These will
linger into tomorrow morning. Red flag warnings will continue
tomorrow afternoon in western north Texas as elevated fire weather
continues. ERCs will edge back up toward the 90th percentile with
winds gusting up to about 25 mph from the south and relative
humidities dropping to about 20 percent. Meanwhile, excessive heat
warnings are in effect for most of the Red River Valley, while heat
advisories are in effect for most of central Oklahoma. Upgrades may
be required as the forecast comes more into focus, but for now it
appears mid-70s dewpoints are possible near and east of I-35.

Meister

&&

.LONG TERM...
(Saturday night through next Thursday)
Issued at 257 PM CDT Fri Aug 11 2023

Storm chances will increase early tomorrow night across the
northwestern part of Oklahoma as a wave rounds the subtropical ridge
into Kansas. Instability will be modest at first, but - stop me if
you've heard this before - deep, well-mixed boundary layers should
encourage forward propagation of outflow and a damaging wind
threat. These storms will likely encounter richer boundary-layer
moisture across north central Oklahoma just as the LLJ increases
to about 35- 45 knots. The threat for severe weather will likely
be maximized in this corridor early during the overnight period.
Chances for storms will continue to linger into early Sunday
morning, and will leak southward into central Oklahoma.

The best chance for widespread storms in the upcoming period looks
to be Sunday night. A powerful closed low will dip southeastward
into the Upper Midwest, bringing the northern half of our area into
30-40 knots of westerly flow. Heavy rainfall looks like the primary
hazard, especially across the northern half of Oklahoma. Severe
weather looks a bit more uncertain due lower overall instability,
but will be monitored.

After rain chances diminish on Monday afternoon, things do look to
calm down for the rest of next week. That's going to let us get hot
and humid once more.

Meister

&&

.AVIATION...
(00Z TAFS)
Issued at 521 PM CDT Fri Aug 11 2023

VFR conditions to continue.

Isolated storms will be possible this evening across west and will
include a mention for a couple of hours at CSM, otherwise chances
too low at this time. Will also keep a mention late evening and
and overnight at both PNC/SWO for some activity. Otherwise, light
south/southeast winds and mid/high clouds overnight and through
much of the day Saturday. Southwest winds will increase by mid-
morning across most sites.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  77 101  74 100 /  20  30  20  10
Hobart OK         78 106  74 104 /  30  20  20  10
Wichita Falls TX  82 109  80 108 /  30  10  10   0
Gage OK           71  97  69  96 /  30  40  50  20
Ponca City OK     73  94  73  94 /  40  40  50  30
Durant OK         79 103  80 104 /   0  10   0   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Heat Advisory until 9 PM CDT this evening for OKZ006>008-011>013-
     015>018-021-022.

     Heat Advisory from noon to 9 PM CDT Saturday for OKZ007-008-012-
     013-018>036-040>043.

     Excessive Heat Warning until 9 PM CDT this evening for OKZ019-
     020-023>048-050>052.

     Excessive Heat Warning from noon to 9 PM CDT Saturday for
     OKZ037>039-044>048-050>052.

TX...Heat Advisory from noon to 9 PM CDT Saturday for TXZ083-084-087.

     Excessive Heat Warning until 9 PM CDT this evening for
     TXZ083>090.

     Excessive Heat Warning from noon to 9 PM CDT Saturday for TXZ085-
     086-088>090.

     Red Flag Warning until 9 PM CDT this evening for TXZ083>090.

     Red Flag Warning from noon to 9 PM CDT Saturday for TXZ083>090.

&&

SHORT TERM...04
LONG TERM....04
AVIATION...30

Hazardous Weather Outlook
National Weather Service Norman OK
1025 PM CDT Fri Aug 11 2023

OKZ004>048-050>052-TXZ083>090-130330-
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-
1025 PM CDT Fri Aug 11 2023

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

.DAY ONE...Tonight...

.Thunderstorms...
Scattered thunderstorms are expected to continue into the
overnight hours from southwest Oklahoma and western north Texas,
up through central portions of the state. A few storms may be
capable of producing damaging wind gusts.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

.Thunderstorms...
Chances for thunderstorms will continue through the weekend.
Severe storms will be possible each day, mainly across the
northern half of Oklahoma.

.Dangerous Heat...
Excessive heat and humidity spread northward over much of Oklahoma
and north Texas through the upcoming weekend.

.Fire Weather...
Elevated fire weather will continue across western north Texas
through the weekend.

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

Special Weather Statement
National Weather Service Norman OK
930 PM CDT Fri Aug 11 2023

OKZ016-017-022-023-120300-
Washita OK-Caddo OK-Custer OK-Blaine OK-
930 PM CDT Fri Aug 11 2023

...A strong thunderstorm will impact portions of northeastern
Washita, northwestern Caddo, southeastern Custer and southwestern
Blaine Counties through 1000 PM CDT...

At 930 PM CDT, Doppler radar was tracking a strong thunderstorm near
Corn, moving east at 30 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Weatherford, Hydro, Corn, and Colony.

This includes Interstate 40 between mile markers 76 and 93.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor NOAA Weather
Radio, local radio stations or available television stations for
additional information and possible warnings from the National
Weather Service.

&&

LAT...LON 3529 9887 3546 9894 3564 9854 3538 9842
TIME...MOT...LOC 0230Z 249DEG 24KT 3541 9883

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

30

Preliminary Local Storm Report
National Weather Service Norman OK
937 PM CDT Fri Aug 11 2023

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

0920 PM     Tstm Wnd Gst     4 S Altus               34.59N 99.34W
08/11/2023  M59 MPH          Jackson            OK   Mesonet

            Altus (ALTU) Mesonet.

&&

MDU

Preliminary Local Storm Report
National Weather Service Norman OK
947 PM CDT Fri Aug 11 2023

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

0915 PM     Tstm Wnd Dmg     Kingfisher              35.85N 97.93W
08/11/2023                   Kingfisher         OK   Storm Chaser

            Social media image showing a large (12 to 18
            inch diameter) tree branch blown down.

&&

MDU

Preliminary Local Storm Report
National Weather Service Norman OK
1000 PM CDT Fri Aug 11 2023

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

0916 PM     Tstm Wnd Gst     1 NE Altus Air Force Ba 34.67N 99.28W
08/11/2023  M61 MPH          Jackson            OK   ASOS

            KLTS.

&&

MDU

Special Weather Statement
National Weather Service Norman OK
1010 PM CDT Fri Aug 11 2023

OKZ035>038-044-TXZ085-120345-
Kiowa OK-Tillman OK-Cotton OK-Comanche OK-Jackson OK-Wilbarger TX-
1010 PM CDT Fri Aug 11 2023

...Strong thunderstorms will impact portions of southwestern
Comanche, northwestern Cotton, southeastern Jackson, south central
Kiowa, Tillman and north central Wilbarger Counties through 1045 PM
CDT...

At 1010 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Indiahoma to 5 miles north of Hollister to
3 miles east of Fargo. Movement was east at 30 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Northwestern Lawton, Frederick, Cache, Snyder, Tipton, Chattanooga,
Mountain Park, Medicine Park, Indiahoma, Manitou, Faxon, Headrick,
Hollister, Loveland, Fort Sill, Fargo, southern Wichita Mountains
Wildlife Refuge, Doris Campground, and The Visitor Center.

This includes Interstate 44 between mile markers 45 and 47.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor NOAA Weather
Radio, local radio stations or available television stations for
additional information and possible warnings from the National
Weather Service.

&&

LAT...LON 3473 9838 3441 9850 3426 9876 3428 9937
      3461 9916 3474 9893
TIME...MOT...LOC 0310Z 280DEG 27KT 3463 9876 3442 9888 3430 9921

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

30

Special Weather Statement
National Weather Service Norman OK
1029 PM CDT Fri Aug 11 2023

OKZ023>025-027-029-120400-
Grady OK-Oklahoma OK-Canadian OK-Caddo OK-Cleveland OK-
1029 PM CDT Fri Aug 11 2023

...Strong thunderstorms will impact portions of northern Grady,
northern Caddo, southwestern Oklahoma, northwestern Cleveland and
southern Canadian Counties through 1100 PM CDT...

At 1029 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Mustang to 5 miles west of Minco to near
Lookeba. Movement was east at 25 mph.

HAZARD...Wind gusts of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Oklahoma City, Del City, El Reno, Yukon, Bethany, Mustang, Warr
Acres, Tuttle, Union City, Minco, Binger, Lookeba, Cogar, Woodlawn
Park, Cedar Lake, The Capitol, Wiley Post Airport, The Fairgrounds,
and Will Rogers Airport.

This includes the following highways...
 Interstate 35 between mile markers 125 and 128.
 Interstate 40 between mile markers 125 and 154.
 Interstate 44 between mile markers 113 and 125.
 Interstate 240 between mile markers 1 and 2.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor NOAA Weather
Radio, local radio stations or available television stations for
additional information and possible warnings from the National
Weather Service.

&&

LAT...LON 3537 9851 3548 9813 3555 9758 3546 9745
      3531 9764 3534 9767 3528 9767 3525 9771
      3522 9817
TIME...MOT...LOC 0329Z 259DEG 21KT 3538 9778 3528 9805 3537 9836

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

30