Special Weather Statement, NWS Fort Worth, TX

Area Forecast Discussion
National Weather Service Fort Worth TX
651 PM CDT Thu Sep 30 2021

...New Short Term, Aviation...

.SHORT TERM... /NEW/
Update:
The previous forecast was adjusted to account for the ongoing
radar trends, as well as trends in the weather models. Main change
was to adjust the timing/highest rain chances southward as the
outflow boundary/front migrate toward Central Texas.

A sea-breeze induced boundary is also migrating northward out of
the Brazos Valley. This boundary may become the focus for
additional convection in the coming hours. The main threat will be
the potential for flooding, but severe storms cannot be ruled out.
The severe threat will remain confined to mainly large hail.

Slightly lower PoPs were introduced west of I-35 starting tomorrow
morning as CAMs show much of the activity remaining east of I-35.
Additional heavy rain will be possible tomorrow, once again
increasing the potential for flooding.

Hernandez

Previous Discussion:
/Today and Tomorrow/

The dryline has been our focus the past two days, but the primary
source of ascent today is coming from broad synoptic scale lift
moving overtop of mesoscale boundaries. We are watching a slow
moving undular bore moving into Western North Texas that is
helping break the surface-based cap and develop scattered showers
and storms to the northwest of DFW. Expect this boundary to slowly
continue south through the afternoon, developing showers and
storms behind the boundary. Expect the coverage of precip to be
most widespread late this afternoon and early tonight--before
about midnight. Approximate timing has this boundary moving into
the Metroplex is around 5-7 PM, Waco around midnight, and deep
Central Texas in the early morning hours.

Deep-layer environmental shear is weak, so cold pool dominant
multicell clusters will be the favored convective mode for this
event. With that being said, there is low potential for a couple
supercells to become strong to borderline severe, but these should
remain relatively isolated and develop along updraft
interactions. The primary threat with this slow moving boundary
will be heavy rain that may lead to isolated instances of
flooding. For the most part, soils are relatively dry, which
should allow for efficient water absorption. However, areas that
received heavy rain the past couple days and/or urban areas that
receive training storms may experience minor flooding and/or
isolated instances of flash flooding this afternoon and early
tonight.

Across the remainder of the area, morning cloud cover has limited
heating, but insolation will gradually erode any inhibition over
the next couple of hours. This will leave us under a buoyant,
uncapped airmass with broad synoptic ascent overhead. This is a
classic recipe for a gradual blossoming of showers/storms this
afternoon with a focus along mesoscale boundaries and within a
theta-e maximum over southeast Texas. Storm coverage across this
area will be much less than the area NW of DFW due to the lack of
focused ascent outside of newly developing outflow boundaries.

Broad cloud cover early tomorrow morning along with a weakening
convective complex should put us under a largely subsident airmass
come daybreak. A few lingering showers or isolated storms will
still be possible, but the lightning threat will be quite low
until later in the day. Synoptic ascent will progressively
increase through the afternoon, with an increasingly divergent
upper level wind field. This will leave us under rather strong
synoptic ascent and deep/strong moisture flux moving in from the
gulf. We expect widespread showers and isolated storms to develop
by sunset tomorrow. At this time, we are not confident about the
exact placement and timing of this precip, but are confident there
will be rain...somewhere. The focus areas/timing should be honed
in with the future forecast updates.

Bonnette

&&

.LONG TERM... /Issued 251 PM CDT Thu Sep 30 2021/
/Friday Night and Beyond/

An upper low over New Mexico will lift northeast through the
Oklahoma Panhandle area Friday night, then continue onward through
the Plains over the weekend, eventually reaching the Great Lakes
by Monday. At the surface, an attendant cold front will slide
slowly and steadily southeast through the region, providing an
added focus for convective development over the weekend before
drawing a cooler, drier, and overall more seasonable airmass
southward through North and Central Texas.

Our next round of convection (which will have fired along the
cold front to the northwest and/or dryline to the west) will
likely be either ongoing or about to enter our west and northwest
zones at the start of the forecast period. Similarly to previous
rounds of convection, multicell clusters should congeal and push
eastward through the forecast area during the overnight hours into
Saturday morning. These storms may present a low-end damaging
wind threat as good overall deep layer shear will be present
(30-40 kt) along with modest instability. Most storms, however,
should remain sub-severe with gusty winds and brief heavy rain
still possible.

A weakening trend may occur Saturday morning as convection
outruns the better forcing and becomes undercut by outflow. This
would likely be temporary though, as one last shortwave rounding
the base of the low should ignite another round of showers and
storms sometime during the day Saturday. At this point (let's say
around midday), the cold front is expected to bisect the CWA
somewhere near a Paris-Dallas-Lampasas line. The front would serve
as a focus for the Saturday convection, both of which will
propagate slowly and steadily east through the southeastern half
of the region Saturday afternoon through Saturday night.

The slow nature of the system will hopefully provide beneficial
rainfall across a good portion of the area. At this time,
additional rainfall totals of 1 to 2 inches are looking fairly
common, with localized higher amounts wherever training showers
and storms may occur. A few spots along the Red River and near the
Highway 281 corridor have already received 2+ inches since
Tuesday. These areas may be quicker to see flooding compared to
the rest of the region, where drier soils should be able to handle
most of the expected rainfall.

A drier and cooler airmass will spread southeast through the
region in the wake of the departing low and cold front. The upper
low will actually become absorbed by a stronger system over the
Great Lakes, which will then dive southward through the Ohio and
Tennessee River Valleys around the middle part of next week. We
will be on the dry and subsident side of the system, with a
possible exception being the far northeast zones where a few wrap
around sprinkles may occur. Otherwise, the resulting upper level
pattern will generate nice and seasonable early to mid October
weather, with sunny days and clear nights, featuring lows in the
50s and 60s and highs in the lower to mid 80s.

30

&&

.AVIATION... /NEW/
/00Z TAFs/

Concerns...Thunderstorms ongoing around D10 airspace and KACT.
Additional convection through the evening. MVFR arriving early
Friday morning. More storms expected tomorrow afternoon.

An outflow boundary now stretches mainly along and south of I-20
as of this writing, gradually moving southward through the rest of
the evening and overnight. Convection has developed on the leading
edge of the boundary, then continuing behind the boundary.
Although the severe weather potential in the immediate Dallas/Fort
Worth Metroplex remains low, lightning will likely remain a threat
through the next several hours.

Ceilings will once again become MVFR tonight and likely linger
through much of the day across the region. Another round of
thunderstorms will be possible tomorrow afternoon, with current
models indicating thunderstorms after 20Z. There remains some
uncertainty regarding tomorrow's convective timing/location,
therefore, expect changes to the TAF through the night and into
tomorrow morning.

Hernandez

&&

.PRELIMINARY POINT TEMPS/POPS...
Dallas-Ft. Worth    69  83  69  81  67 /  60  70  60  80  20
Waco                70  84  69  81  67 /  70  70  50  80  20
Paris               69  82  68  79  67 /  60  60  70  90  50
Denton              66  83  66  81  62 /  60  60  70  80  20
McKinney            68  83  68  80  65 /  60  70  70  90  30
Dallas              71  84  71  82  69 /  70  70  60  80  20
Terrell             69  84  68  80  67 /  70  70  50  90  30
Corsicana           70  84  69  81  68 /  70  70  40  80  30
Temple              68  84  68  82  66 /  60  70  50  80  30
Mineral Wells       65  80  66  80  62 /  80  60  70  70  10

&&

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

Hazardous Weather Outlook
National Weather Service Fort Worth TX
133 PM CDT Thu Sep 30 2021

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-011200-
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-
133 PM CDT Thu Sep 30 2021

This Hazardous Weather Outlook is for North and Central Texas.

.DAY ONE...This Afternoon and Tonight.
There will be a risk for thunderstorms this afternoon and tonight
across much of North and Central Texas. Wind gusts to 50 mph along
with hail will be possible primarily across western North Texas this
afternoon and early tonight. Heavy rainfall may also result in
isolated instances of flooding.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
A few more rounds of scattered to numerous storms are in the forecast
through Saturday night. Severe weather is not anticipated, but heavy
rainfall could result in localized flooding. Storm chances end from
west to east on Sunday.

.SPOTTER INFORMATION STATEMENT...
Formal spotter activation is not anticipated, but timely reports of
wind, hail, and/or flooding are appreciated.

Special Weather Statement
National Weather Service Fort Worth TX
304 PM CDT Thu Sep 30 2021

TXZ115-302030-
Stephens TX-
304 PM CDT Thu Sep 30 2021

...A strong thunderstorm will impact portions of Stephens County
through 330 PM CDT...

At 304 PM CDT, Doppler radar was tracking a strong thunderstorm near
Breckenridge, moving east at 25 mph.

HAZARD...Winds in excess of 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Breckenridge, Necessity and Crystal Falls.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3295 9859 3260 9861 3274 9909 3295 9910
TIME...MOT...LOC 2004Z 286DEG 22KT 3280 9893

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

79

Special Weather Statement
National Weather Service Fort Worth TX
332 PM CDT Thu Sep 30 2021

TXZ102-302100-
Wise TX-
332 PM CDT Thu Sep 30 2021

...A strong thunderstorm will impact portions of northwestern Wise
County through 400 PM CDT...

At 331 PM CDT, Doppler radar was tracking a strong thunderstorm over
Chico, or 9 miles north of Bridgeport, moving north at 10 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Alvord and Chico.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3324 9772 3322 9791 3333 9792 3343 9792
      3343 9769
TIME...MOT...LOC 2031Z 181DEG 12KT 3333 9781

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

79

Special Weather Statement
National Weather Service Fort Worth TX
358 PM CDT Thu Sep 30 2021

TXZ102-302130-
Wise TX-
358 PM CDT Thu Sep 30 2021

...A strong thunderstorm will impact portions of northwestern Wise
County through 430 PM CDT...

At 358 PM CDT, Doppler radar was tracking a strong thunderstorm near
Chico, or 9 miles northwest of Bridgeport. This storm was nearly
stationary.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Chico.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3325 9778 3325 9792 3343 9792 3343 9777
TIME...MOT...LOC 2058Z 265DEG 0KT 3330 9787

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

79

Special Weather Statement
National Weather Service Fort Worth TX
516 PM CDT Thu Sep 30 2021

TXZ100-101-116-302245-
Palo Pinto TX-Young TX-Jack TX-
516 PM CDT Thu Sep 30 2021

...A strong thunderstorm will impact portions of southeastern Young,
southwestern Jack and northwestern Palo Pinto Counties through 545 PM
CDT...

At 516 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Graford, or 13 miles southeast of Graham, moving east
at 10 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Graford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3306 9851 3312 9827 3290 9818 3284 9846
      3294 9851
TIME...MOT...LOC 2216Z 257DEG 10KT 3296 9841

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

79

Special Weather Statement
National Weather Service Fort Worth TX
536 PM CDT Thu Sep 30 2021

TXZ115-116-129-302300-
Palo Pinto TX-Stephens TX-Eastland TX-
536 PM CDT Thu Sep 30 2021

...A strong thunderstorm will impact portions of Eastland, Stephens
and southwestern Palo Pinto Counties through 600 PM CDT...

At 536 PM CDT, Doppler radar was tracking a strong thunderstorm over
Ranger, moving north at 10 mph.

HAZARD...Winds in excess of 30 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Breckenridge, Eastland, Cisco, Ranger, Gorman, Rising Star, Possum
Kingdom State Park, Necessity, Gunsight, Crystal Falls, Strawn and
Carbon.

This includes Interstate 20 between mile markers 324 and 363.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3295 9909 3295 9857 3267 9846 3230 9848
      3208 9893 3208 9912
TIME...MOT...LOC 2236Z 185DEG 7KT 3244 9867

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...30 MPH

30

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