Special Weather Statement, NWS Fort Worth, TX

Area Forecast Discussion
National Weather Service Fort Worth TX
209 AM CDT Sun Jul 11 2021

...New Long Term...

.SHORT TERM... /Issued 741 PM CDT Sat Jul 10 2021/
/Tonight through Sunday Night/

The remaining few showers across Central TX this evening should
continue to taper off over the next couple of hours. The rain-
free period tonight will be somewhat short lived as the storms
currently along the cold front in northern Oklahoma should
approach the Red River after midnight tonight. These storms are
expected to decrease in coverage and strength as they approach
the Metroplex late overnight although a few strong wind gusts may
occur. Early tomorrow, the influence of the upper level ridge to
our west will diminish over our area slightly, allowing for
stronger upper level northwesterly flow to nudge into the area.
This should provide some additional southward push to the
boundary through the afternoon. The primary driver in determining
the areas that see storms re-develop along the front through the
afternoon will be the strength of the outflow boundaries
associated with tonight's storms. With this uncertainty, the
second round of thunderstorms will likely initiate near or just
south of the Metroplex. Damaging winds will again be the primary
hazard along with a threat for isolated severe hail.

For the rest of tonight, we'll have increasing PoPs north of I-20
to the Red River after midnight into the early morning hours
Sunday. After a brief lull in activity during the mid morning
hours, PoPs will increase again into the afternoon as we get into
peak heating and the remnant frontal boundary sags into Central
Texas.

Gordon

&&

.LONG TERM... /NEW/
/Monday and Beyond/

The upper low partially responsible for our ongoing weather
pattern shift will begin to open into a trough, which will extend
from the Great Lakes to Central Texas on Monday. Weak ascent
associated with the trough axis should be ongoing at the start of
the forecast period. Another round of scattered showers and storms
can therefore be expected by Monday afternoon, with the best rain
chances being in the vicinity of the remnant surface front. The
severe threat should lessen by then due to weaker flow aloft, but
there may still be a few strong storms capable of producing gusty
winds, heavy rain, and small hail. Storms should gradually weaken
while moving east of the region Monday night.

The upper trough will finally lift off to the northeast on Tuesday
while a mid and upper ridge noses in from the west. This will
decrease the rain chances and return the area to more typical July
weather for mid to late week. Will stick close to the NBM for
temperatures with near seasonable normal values expected
Wednesday through next weekend. After Monday, it looks like our
rain chances will be slim and limited mainly to the east and
southeast zones where the afternoon seabreeze will occasionally
make its presence known. Otherwise, highs in the low to mid 90s
and lows in the 70s can be expected Tuesday through the end of the
period.

30

&&

.AVIATION...  /Issued 741 PM CDT Sat Jul 10 2021/
/00Z TAFs/

Main concern through Sunday will be widespread convective
potential. Line of thunderstorms organizing in Oklahoma will head
south overnight and should approach the Metroplex airports well
after midnight, in a weakened state. We'll continue with a VCTS
from 8-12Z with VFR prevailing outside of any convection.

Outflow and the associated frontal boundary will be in the
vicinity of the Metroplex during the late morning and will serve
as a focus for additional convection Sunday afternoon. Significant
impacts to departures/arrivals should be anticipated along with
variable winds in an around convection through the afternoon. Most
of the activity should gradually slide southward into Central
Texas by late afternoon/evening.  VFR will prevail Sunday night.

Dunn

&&

.PRELIMINARY POINT TEMPS/POPS...
Dallas-Ft. Worth    92  74  92  75  94 /  50  20  30  10  10
Waco                93  73  89  73  92 /  60  40  40   5   5
Paris               88  70  89  71  90 /  40  10  20  20  20
Denton              93  71  92  73  94 /  40  20  20  10  10
McKinney            91  71  91  73  92 /  40  20  20  10  10
Dallas              93  75  92  76  94 /  50  30  30  10  10
Terrell             89  71  90  73  91 /  60  40  30  10  10
Corsicana           89  74  90  73  91 /  60  50  40  10  10
Temple              91  73  90  71  92 /  50  30  30   5   5
Mineral Wells       92  70  90  71  93 /  50  20  30   5   5

&&

.FWD WATCHES/WARNINGS/ADVISORIES...
None.
&&

Hazardous Weather Outlook
National Weather Service Fort Worth TX
328 AM CDT Sun Jul 11 2021

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-111200-
Montague-Cooke-Grayson-Fannin-Lamar-Young-Jack-Wise-Denton-Collin-
Hunt-Delta-Hopkins-Stephens-Palo Pinto-Parker-Tarrant-Dallas-
Rockwall-Kaufman-Van Zandt-Rains-Eastland-Erath-Hood-Somervell-
Johnson-Ellis-Henderson-Comanche-Mills-Hamilton-Bosque-Hill-Navarro-
Freestone-Anderson-Lampasas-Coryell-Bell-McLennan-Falls-Limestone-
Leon-Milam-Robertson-
328 AM CDT Sun Jul 11 2021

This Hazardous Weather Outlook is for North and Central Texas.

.DAY ONE...Today and Tonight.

A few strong to marginally severe storms will continue through
daybreak for areas near and just north of the I-20 corridor. Main
threats will be very gusty storm outflow winds, small hail, and brief
heavy rainfall up to an inch across a few areas.

As a weak cold front sinks south into, or just south of the I-20
corridor by this afternoon, scattered thunderstorms will re-develop
near and ahead of this boundary. Storms should continue to persist
into the evening hours across Central TX.

A few strong to severe  storms will be possible. Damaging winds and
hail will be the primary hazards. In addition, isolated instances of
very heavy rainfall could produce minor flooding of typical low lying
areas.

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

Isolated to scattered storms can be expected across Central Texas
Tuesday through Friday.

.SPOTTER INFORMATION STATEMENT...
Limited spotter activation may be requested later today, mainly south
of I-20, or I-30 across East Texas.

Special Weather Statement
National Weather Service Fort Worth TX
213 AM CDT Sun Jul 11 2021

TXZ091>093-102>104-110800-
Collin TX-Denton TX-Grayson TX-Cooke TX-Montague TX-Wise TX-
213 AM CDT Sun Jul 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN MONTAGUE...WISE...
DENTON...COLLIN...COOKE AND GRAYSON COUNTIES UNTIL 300 AM CDT...

At 213 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Van Alstyne to 6 miles east of Newport.
Movement was south at 25 mph.

Winds in excess of 40 mph will be possible with these storms.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Seek a safe shelter inside a building or vehicle.

&&

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
north central Texas.

LAT...LON 3367 9638 3334 9639 3335 9629 3298 9630
      3300 9792 3343 9792 3345 9798 3371 9797
TIME...MOT...LOC 0713Z 000DEG 21KT 3345 9657 3345 9791

30

Special Weather Statement
National Weather Service Fort Worth TX
232 AM CDT Sun Jul 11 2021

TXZ100-101-110800-
Young TX-Jack TX-
232 AM CDT Sun Jul 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR YOUNG AND JACK COUNTIES UNTIL 300
AM CDT...

At 231 AM CDT, Doppler radar was tracking a strong thunderstorm near
Olney, moving south at 40 mph.

Wind gusts up to 50 mph will be possible with this storm.

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
north central Texas.

LAT...LON 3340 9895 3340 9842 3347 9842 3347 9798
      3344 9798 3343 9792 3300 9792 3301 9843
      3296 9843 3297 9895
TIME...MOT...LOC 0731Z 001DEG 45KT 3336 9866

30

Special Weather Statement
National Weather Service Fort Worth TX
252 AM CDT Sun Jul 11 2021

TXZ102>104-110830-
Collin TX-Denton TX-Wise TX-
252 AM CDT Sun Jul 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR WISE...DENTON AND COLLIN COUNTIES
UNTIL 330 AM CDT...

At 252 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Farmersville to near Boonsville. Movement was
south at 30 mph.

Winds in excess of 40 mph will be possible with these storms.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Seek a safe shelter inside a building or vehicle.

&&

LAT...LON 3340 9639 3334 9638 3335 9629 3298 9630
      3300 9792 3342 9792
TIME...MOT...LOC 0752Z 338DEG 27KT 3318 9635 3315 9788

30

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Special Weather Statement
National Weather Service Fort Worth TX
343 AM CDT Sun Jul 11 2021

TXZ103-104-118-119-110930-
Collin TX-Denton TX-Tarrant TX-Dallas TX-
343 AM CDT Sun Jul 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN DENTON...TARRANT...
SOUTHWESTERN COLLIN AND NORTHWESTERN DALLAS COUNTIES UNTIL 430 AM
CDT...

At 343 AM CDT, Doppler radar was tracking a strong thunderstorm over
Southlake, moving southeast at 35 mph.

Winds in excess of 40 mph will be possible with this storm.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm. Seek
a safe shelter inside a building or vehicle.

&&

LAT...LON 3298 9651 3295 9652 3262 9693 3263 9755
      3299 9752 3299 9740 3305 9740 3333 9684
TIME...MOT...LOC 0843Z 333DEG 32KT 3296 9716

30