Flash Flood Warning 30, NWS Austin/San Antonio, TX

066 
WGUS74 KEWX 100557
FFSEWX

Flash Flood Statement
National Weather Service Austin/San Antonio TX
1257 AM CDT Thu Sep 10 2020

TXC013-100715-
/O.CON.KEWX.FF.W.0030.000000T0000Z-200910T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Atascosa TX-
1257 AM CDT Thu Sep 10 2020

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 AM CDT EARLY THIS 
MORNING FOR CENTRAL ATASCOSA COUNTY...

At 1257 AM CDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 2 and 5 inches of rain 
have fallen. Flash flooding is ongoing.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Doppler radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Pleasanton, Jourdanton, Poteet, Charlotte, Christine, Leming, 
  Dobrowolski, Coughran, Amphion, McCoy and Graytown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 2897 9879 2906 9868 2909 9840 2890 9822
      2864 9849 2864 9850 2864 9852 2864 9856
      2864 9859 2864 9862 2864 9863 2864 9865

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

RUNYEN

276 
WGUS54 KEWX 100655
FFWEWX
TXC013-100930-
/O.EXT.KEWX.FF.W.0030.000000T0000Z-200910T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
155 AM CDT Thu Sep 10 2020

The National Weather Service in Austin/San Antonio has extended the

* Flash Flood Warning for...
  Central Atascosa County in south central Texas...

* Until 430 AM CDT.

* At 155 AM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms have produced between 2 and 5 inches of rain. Flash 
  flooding is ongoing.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Doppler radar and automated gauges.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Pleasanton, Jourdanton, Poteet, Charlotte, Christine, Leming, 
  Dobrowolski, Coughran, Amphion, McCoy and Graytown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 2897 9879 2906 9868 2909 9840 2890 9822
      2864 9849 2864 9850 2864 9852 2864 9856
      2864 9859 2864 9862 2864 9863 2864 9865

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

RUNYEN

254 
WGUS74 KEWX 100830
FFSEWX

Flash Flood Statement
National Weather Service Austin/San Antonio TX
330 AM CDT Thu Sep 10 2020

TXC013-100930-
/O.CON.KEWX.FF.W.0030.000000T0000Z-200910T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Atascosa TX-
330 AM CDT Thu Sep 10 2020

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 AM CDT EARLY THIS 
MORNING FOR CENTRAL ATASCOSA COUNTY...

At 330 AM CDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 2 
and 5 inches of rain have fallen. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Doppler radar and automated gauges.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Pleasanton, Jourdanton, Poteet, Charlotte, Christine, Leming, 
  Dobrowolski, Coughran, Amphion, McCoy and Graytown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 2897 9879 2906 9868 2909 9840 2890 9822
      2864 9849 2864 9850 2864 9852 2864 9856
      2864 9859 2864 9862 2864 9863 2864 9865

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

RUNYEN

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

.AVIATION.../00Z TAFS/
Cold front is right on the doorstep of the I-35 terminals and should
pass through all 3 sites by around 0030Z. As is seen in the KDFX VAD
winds the front is only going to be 3-4 KFT deep overnight and will
initially be even more shallow along I-35 this evening. Thus there
should be a long period of overrunning potential and a few evening
thunderstorms to impact SAT/SSF the most. Toward daybreak most
stations should trend lower on cigs with the light precip falling
through the inversion, so a prevailing IFR CIG would seem to be the
way to start daytime Thursday.

&&

.PREV DISCUSSION... /ISSUED 318 PM CDT Wed Sep 9 2020/

SHORT TERM (Tonight through Thursday Night)...

The cold front is slowly pushing across the western part of South
Central Texas this afternoon. Based on latest surface observations
the cold front is oriented from northeast to southwest along a Llano
to Uvalde to Carrizo Springs. Most of the convection showing on
radar is ahead of the front where dew points are in the 60s to lower
70s. Behind the front, a cool airmass is spreading across the Rio
Grande and parts of western Hill Country with temperatures in the
upper 50s (ex. Rocksprings as of this writing).

The frontal boundary is forecast to push across the rest of the Hill
Country early this evening and over the I-35 corridor between 9 PM
and midnight tonight. As it does that, a new surge of showers and
thunderstorms is expected along and ahead of the front with heavy
rainfall possible through the period, leading to flash flooding. As
a reminder, a Flash Flood Watch is in effect for areas along and
north of a Del Rio to San Antonio to Georgetown line, including the
Austin and San Antonio Metro areas through 1 PM Thursday.

Most HiRes models suggest for the development of a surface low
across the southern portion of South Central Texas this evening and
moves it into the Rio Grande overnight while slowing the progression
of the frontal boundary. At upper level, a low pressure system over
the four corners region is forecast to lift into the northern
portion of the Southern Plains through Thursday, providing enough
support for convection activity through the short term period.

With a tropical airmass in place (pwats of 2.2 to 2.3 inches),
expect heavy downpours that could possibly drop one inch of
rainfall in a short period of time. Rainfall event totals through
Thursday afternoon could range from 2 to 5 inches with isolated 8
inches. Lesser amounts are expected across the far eastern part of
South Central Texas. The shower activity is expected to decrease on
Thursday afternoon across parts of the Hill Country as northerly
winds spread across the area and a drier airmass pushes into the
area. Expect overnight lows to reach the upper 50s across the Hill
Country to 60s over the rest of the region. Thursday's high
temperatures only in the 60s over the Hill Country to mid 70s along
the I-35 corridor and mid 80s across the Coastal Plains.

LONG TERM (Friday through Wednesday)...
Temperatures will begin to slowly warm back to early September climo
norms for the start of the long term. Afternoon highs on Friday are
forecast to still be below normal with upper 70s to upper 80s across
the region. The front will have since dissipated and the cut off low
that brought us the front will open up and move across the Northern
and Central Plains. In it's wake a weak troughing pattern will be
left over the state. Plenty of moisture will still be pooled over
South-Central Texas and will keep chances for showers and storms in
the forecast through early next week. WPC QPF throughout the long
term only has 1/2 - 2 inches widespread rain over a 5 day period. As
of now, there is no heavy rainfall or flash flooding concerns
through this period. Temperatures after Saturday will climb into the
low 90s for areas along and east of I-35 and in the mid to upper 80s
for the rest of the region.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              64  72  63  84  70 /  70  40  10  20   0
Austin Bergstrom Intl Airport  65  73  64  85  69 /  70  40  20  20   0
New Braunfels Muni Airport     65  74  64  84  69 /  70  50  20  20  -
Burnet Muni Airport            60  67  60  80  66 /  90  40  10  20   0
Del Rio Intl Airport           59  66  61  84  70 /  90  60  40  40  20
Georgetown Muni Airport        62  69  62  84  68 /  80  40  10  20   0
Hondo Muni Airport             64  77  64  89  69 /  90  60  30  30  10
San Marcos Muni Airport        65  73  63  84  69 /  70  50  20  20  -
La Grange - Fayette Regional   69  79  66  89  72 /  40  40  20  20   0
San Antonio Intl Airport       65  74  65  86  71 /  70  60  20  20  -
Stinson Muni Airport           67  76  66  86  71 /  80  50  30  20  -

&&

.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...Oaks
Long-Term...Runyen

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
857 PM CDT Wed Sep 9 2020

TXZ171>173-183>194-202>209-217>225-228-110200-
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-
857 PM CDT Wed Sep 9 2020

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

.DAY ONE...Tonight.

Moderate to occasionally heavy rains can be expected across much
of South Central Texas through tonight. There remains a Flash
Flood Watch in effect through 1 PM CDT on Thursday for areas
along and north of a Del Rio to San Antonio to Georgetown line,
including the Austin and San Antonio Metro areas. There is a
potential for an additional 1 to 3 inches through early Thursday.
With soils already saturated from the rains that have fallen, any
additional rainfall amounts over one-half inch will likely turn
into immediate run-off.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The Flash flood threat is expected to diminish by 1 PM CDT
Thursday. However, additional chances of showers and
thunderstorms will remain in the forecast each day through
Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.