Flash Flood Watch 2, NWS Austin/San Antonio, TX

858 
WGUS64 KEWX 092029
FFAEWX

Flood Watch
National Weather Service Austin/San Antonio TX
329 PM CDT Wed Sep 9 2020

TXZ171>173-183>192-202>206-100900-
/O.CON.KEWX.FF.A.0002.000000T0000Z-200910T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Kinney-Uvalde-Medina-Bexar-
Comal-
Including the cities of Georgetown, Llano, Boerne, Bracketville, 
Burnet, Blanco, Fredericksburg, Bandera, San Antonio, Del Rio, San 
Marcos, Rocksprings, Leakey, New Braunfels, Austin, Hondo, Uvalde, 
and Kerrville
329 PM CDT Wed Sep 9 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON...

The Flash Flood Watch continues for

* A portion of south central Texas, including the following areas, 
  Bandera, Bexar, Blanco, Burnet, Comal, Edwards, Gillespie, Hays, 
  Kendall, Kerr, Kinney, Llano, Medina, Real, Travis, Uvalde, Val 
  Verde and Williamson.

* Through Thursday afternoon

* A cold front and deep moist southerly flow will bring showers and 
  thunderstorms to all of South Central Texas. Repeated rounds of 
  showers and thunderstorms will lead to flash flooding with the 
  greatest threat along and north of a Del Rio to San Antonio to 
  Georgetown line, including the Austin and San Antonio Metro areas. 
  Rainfall totals for through Thursday will be 2 to 5 inches with 
  isolated totals up to 8 inches possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Stay away or be swept away. River banks and culverts can become 
unstable and unsafe.

&&

$$

BF

291 
WGUS64 KEWX 100904
FFAEWX

Flood Watch
National Weather Service Austin/San Antonio TX
404 AM CDT Thu Sep 10 2020

TXZ171>173-183>192-202>206-101800-
/O.CON.KEWX.FF.A.0002.000000T0000Z-200910T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Kinney-Uvalde-Medina-Bexar-
Comal-
Including the cities of Llano, Burnet, Georgetown, Del Rio, 
Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, 
Blanco, San Marcos, Austin, Bracketville, Uvalde, Hondo, 
San Antonio, and New Braunfels
404 AM CDT Thu Sep 10 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 1 PM CDT THIS
AFTERNOON...

The Flash Flood Watch continues for

* A portion of south central Texas, including the following 
  areas, Bandera, Bexar, Blanco, Burnet, Comal, Edwards, 
  Gillespie, Hays, Kendall, Kerr, Kinney, Llano, Medina, Real, 
  Travis, Uvalde, Val Verde, and Williamson. 

* Until 1 PM CDT this afternoon

* A moist airmass remains above a shallow cold airmass. Showers
  and isolated thunderstorms continue this morning. Additional
  rainfall amounts up to 2 inches are possible. This heavy rain,
  in combination with saturated soils due to heavy rains of the
  last 24 hours will easily generate faster runoff leading to new
  flash flooding. The greatest threat area is across the eastern
  Hill Country to along the I-35 corridor where most areas have
  had over 2 inches of rain with a few spots having over 6 inches
  of rain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Stay away or be swept away. River banks and culverts can become
unstable and unsafe.

&&

$$

986 
WGUS64 KEWX 101815
FFAEWX

Flood Watch
National Weather Service Austin/San Antonio TX
115 PM CDT Thu Sep 10 2020

...THE FLASH FLOOD WATCH HAS BEEN ALLOWED TO EXPIRE...

.The heavy rain threat has ended as the front has moved well to
the south of our CWA.

TXZ171>173-183>192-202>206-101915-
/O.EXP.KEWX.FF.A.0002.000000T0000Z-200910T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Kinney-Uvalde-Medina-Bexar-
Comal-
Including the cities of Llano, Burnet, Georgetown, Del Rio, 
Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, 
Blanco, San Marcos, Austin, Bracketville, Uvalde, Hondo, 
San Antonio, and New Braunfels
115 PM CDT Thu Sep 10 2020

...FLASH FLOOD WATCH HAS EXPIRED...

The Flash Flood Watch for a portion of south central Texas has
expired. No more heavy rain is expected.

$$

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
346 AM CDT Wed Sep 9 2020

.SHORT TERM (Today through Thursday)...
Area radars show showers and a few thunderstorms increasing in
coverage over the Hill Country, Edwards Plateau, and Escarpment
areas with some training of cells. This is due to forcing from an
approaching cold front along with a moist southerly lower to mid
jet. Some spots have already received 1 to 2 inches based on
radar/MRMS estimates. The cold front is currently moving into Val
Verde county, slightly ahead of schedule. A consensus of the Hi-Res
models indicate it will filter south across the Rio Grande and
Edwards Plateau this morning, then east into the Hill Country this
afternoon, across the I-35 corridor this evening into overnight, and
finally pushing into the Coastal Plains Thursday morning. The closed
mid and upper level low will remain near the Four Corners region
through Thursday. The moist unidirectional southerly flow will
impinge on the front enhancing the forcing to keep numerous to
widespread showers going in the same areas, though with time the
activity focuses on the Hill Country and I-35 corridor as the front
pushes southeast. Confidence has increased on the threat of heavy
rains and flooding due to the forcing of the slow moving front,
moist (PWs of 2 to 2.3 inches) southerly lower to mid level jet, and
training of cells. Have issued a Flash Flood Watch for areas along
and north of a Del Rio to San Antonio to Georgetown line, including
the Austin and San Antonio Metro areas. Rainfall totals for today
through Thursday will be 2 to 5 inches with isolated totals up to 8
inches in the Watch area with 1 to 3 inches elsewhere. WPC has a
moderate risk of excessive rainfall for this area. Minimal
instability (with an elevated freezing level) and shear
(unidirectional southerly flow with little speed shear) will keep
thunderstorms isolated to widely scattered in coverage and sub-
severe. On Thursday, the showers and thunderstorms will focus back
to the west due to weak mid and upper level ridging and slightly
drier air moving in from the northeast. Temperatures for today
through Thursday will be dependent on the front, turning much cooler
and well below normal in its wake, though below normal elsewhere due
to the extensive cloudiness and rain.

&&

.LONG TERM (Thursday Night through Tuesday)...
Temperatures Thursday night are again dependent on the placement of
the front. With cloudy skies, there won't be sufficient cooling
taking place, northerly winds at the surface could have most of the
area still a few degrees below normal Thursday night. By Friday, the
front dissolves as the upper low shifts northeast into the Central
Plains. Temperatures start to climb again into the mid 80s.
Disturbances in the somewhat undefined troughing pattern coupled
with sufficient moisture will continue rain chances going into the
weekend. Weekend temperature will be back in the upper 80s to low
90s, closer to early September normals. A weak mid level trough
pulling south into the Central Plains maintains the rain chances into
the beginning of next week.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              83  66  75  67  84 /  90  70  40  20  20
Austin Bergstrom Intl Airport  84  66  76  66  84 /  90  70  40  20  20
New Braunfels Muni Airport     83  66  76  67  85 /  80  70  50  30  30
Burnet Muni Airport            80  61  70  63  80 /  90  80  50  20  20
Del Rio Intl Airport           81  61  68  66  83 /  90  80  80  70  40
Georgetown Muni Airport        81  64  73  66  83 /  90  70  40  20  20
Hondo Muni Airport             86  66  73  67  87 /  90  80  50  40  30
San Marcos Muni Airport        82  65  76  66  85 /  80  70  40  20  20
La Grange - Fayette Regional   84  70  83  69  90 /  80  30  30  20  20
San Antonio Intl Airport       84  66  74  68  86 /  90  80  50  30  30
Stinson Muni Airport           86  68  76  69  86 /  90  70  50  30  30

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch through Thursday afternoon for Bandera-Bexar-
Blanco-Burnet-Comal-Edwards-Gillespie-Hays-Kendall-Kerr-Kinney-
Llano-Medina-Real-Travis-Uvalde-Val Verde-Williamson.

&&

Short-Term/Aviation...YBVP
Long-Term...04

Hazardous Weather Outlook...UPDATED
National Weather Service Austin/San Antonio TX
1036 PM CDT Tue Sep 8 2020

TXZ171>173-183>194-202>209-217>225-228-100345-
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Kinney-Uvalde-
Medina-Bexar-Comal-Guadalupe-Caldwell-Fayette-Maverick-Zavala-
Frio-Atascosa-Wilson-Karnes-Gonzales-De Witt-Lavaca-Dimmit-
1036 PM CDT Tue Sep 8 2020

This Hazardous Weather Outlook is for South-Central Texas..

.DAY ONE...Today And Tonight.
Numerous showers and thunderstorms are expected west of Highway
281 late tonight as a cold front and weak disturbances begin to
approach from the north and west. Heavy rainfall amounts of 1 to 3
inches are forecast for areas northwest of a line from Kerrville
to Del Rio, with isolated higher totals around 4 inches possible
by daybreak.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

The heavy rain threat is expected to expand east during the day
Wednesday, as the cold front advances to the I-35 Corridor by
Wednesday night. There will remain a high potential for heavy rain
near and behind the cold front as it moves through the rest of
South Central Texas by Thursday. Highest rainfall potential
through Thursday night is expected to be west of a line from
Kerrville to Eagle Pass, where 2 to 4 inch rainfall amounts will
be common, and isolated 8 inch totals will be possible. East of
the Kerrville to Eagle Pass line into the I-35 Corridor, slightly
lower amounts of 1 to 3 inches and isolated 5 inch totals are
expected through Thursday night. A Flash Flood Watch will likely
be needed.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.