Flash Flood Warning 9, NWS Austin/San Antonio, TX

451 
WGUS74 KEWX 201948
FFSEWX

Flash Flood Statement
National Weather Service Austin/San Antonio TX
248 PM CDT Mon Apr 20 2026

TXC029-091-187-202200-
/O.CON.KEWX.FF.W.0009.000000T0000Z-260420T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bexar TX-Comal TX-Guadalupe TX-
248 PM CDT Mon Apr 20 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM CDT THIS 
AFTERNOON FOR NORTHEASTERN BEXAR, SOUTHEASTERN COMAL AND WEST 
CENTRAL GUADALUPE COUNTIES...

At 248 PM CDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 2 
and 3 inches of rain have fallen. Additional rainfall amounts of 1 
to 2 inches are possible in the warned area. Flash flooding is 
ongoing or expected to begin shortly.

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

SOURCE...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...
  San Antonio, New Braunfels, Schertz, Cibolo, Converse, Universal 
  City, Live Oak, Selma, Randolph AFB, San Antonio Int Airport, 
  Kirby, Alamo Heights, Windcrest, Terrell Hills, Bulverde, Garden 
  Ridge, Shavano Park, Hollywood Park, McQueeney and Olmos Park.

A swift water rescue was reported at the intersection of Nacogdoches 
and Cattleman Street in NE Bexar County at 210pm.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

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

&&

LAT...LON 2956 9860 2973 9838 2978 9814 2969 9799
      2953 9810 2939 9846

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

$$

MM

016 
WGUS54 KEWX 202022
FFWEWX
TXC029-091-187-202300-
/O.EXT.KEWX.FF.W.0009.000000T0000Z-260420T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
322 PM CDT Mon Apr 20 2026

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

* Flash Flood Warning for...
  Northeastern Bexar County in south central Texas...
  Southeastern Comal County in south central Texas...
  West Central Guadalupe County in south central Texas...

* Until 600 PM CDT.

* At 322 PM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  2 and 3 inches of rain have fallen. Additional rainfall amounts of 
  1 to 2 inches are possible in the warned area. Flash flooding is 
  already occurring.

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

  SOURCE...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...
  San Antonio, New Braunfels, Schertz, Cibolo, Converse, Universal 
  City, Live Oak, Selma, Randolph AFB, San Antonio Int Airport, 
  Kirby, Alamo Heights, Windcrest, Terrell Hills, Bulverde, Garden 
  Ridge, Shavano Park, Hollywood Park, McQueeney and Olmos Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

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

&&

LAT...LON 2956 9860 2973 9838 2978 9814 2969 9799
      2953 9810 2939 9846

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

$$

MM

630 
WGUS74 KEWX 202215
FFSEWX

Flash Flood Statement
National Weather Service Austin/San Antonio TX
515 PM CDT Mon Apr 20 2026

TXC029-091-187-202300-
/O.CON.KEWX.FF.W.0009.000000T0000Z-260420T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bexar TX-Comal TX-Guadalupe TX-
515 PM CDT Mon Apr 20 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM CDT THIS EVENING 
FOR NORTHEASTERN BEXAR, SOUTHEASTERN COMAL AND WEST CENTRAL 
GUADALUPE COUNTIES...

At 515 PM CDT, Doppler radar and automated rain gauges indicated 
heavy rain across the northeast part of Bexar County including the 
San Antonio International Airport and points to the northeast of 
there. Between 2 and 4 inches of rain have fallen over the northeast 
of Bexar County for the past three hours. Additional rainfall 
amounts of 1 to 2 inches are possible within the hour. Flash 
flooding is already occurring.

HAZARD...Life threatening flash flooding. Heavy rain producing
         flash flooding.

SOURCE...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...
  San Antonio, New Braunfels, Schertz, Cibolo, Converse, Universal 
  City, Live Oak, Selma, Randolph AFB, San Antonio Int Airport, 
  Kirby, Alamo Heights, Windcrest, Terrell Hills, Bulverde, Garden 
  Ridge, Shavano Park, Hollywood Park, McQueeney and Olmos Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

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

&&

LAT...LON 2956 9860 2973 9838 2978 9814 2969 9799
      2953 9810 2939 9846

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

$$

OB

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
1256 PM CDT Mon Apr 20 2026

...New AVIATION...

.KEY MESSAGES...

- Level 1 of 4 risk of Excessive Rainfall central part of South-
  Central Texas today. Locally heavy rain up to 3" possible.

- Soggy Monday likely for most and for the eastern two-thirds of
  the area again on Tuesday.

- Cool weather continues into Tuesday with near normal
  temperatures Wednesday and a warming trend for late week.

&&

.SHORT TERM...
(Today through Tuesday)
Issued at 1229 AM CDT Mon Apr 20 2026

Showers and isolated thunderstorms are currently ongoing across the
area at this hour with activity expected to continue and increase in
coverage as the main disturbance responsible slowly shifts eastward.
At the same time, the upper-level ridging responsible for keeping
our northern and eastern CWA areas dry is moving off to the east.
This will result in additional overrunning and development of
widespread showers continuing into daybreak this morning. Most
activity is expected to remain fairly light. However, the atmosphere
is very moist and as such the HREF PMM 24 hour QPF is still showing
a wide swath of 1-2 inches for our area. So any heavier cells could
certainly take advantage of this as there remains some instability
aloft. Temperatures look to stay fairly cool for this time of year as
many areas remain locked under showers and thick cloud cover with
areas remaining in the 50s and perhaps mid 60s. Another round of
rain showers along with isolated thunderstorms looks set to impact
the eastern two thirds of our area heading into Tuesday with rain
cool air and CAA once again helping to limit afternoon high
temperatures with most barely hitting 70 degrees. Main exception
would be for those under a developing shortwave ridge out west. As a
result, areas across the Rio Grande plains can expect to see highs
in the mid to upper 70s.

&&

.LONG TERM...
(Tuesday night through Sunday)
Issued at 1229 AM CDT Mon Apr 20 2026

Tuesday night we should see rain chances decrease somewhat before a
second wave of energy moves back into the area helping to kick off
more showers and isolated storms with our overrunning/isentropic
lift type pattern continuing into early Wednesday. We finally start
to dry out by Wednesday afternoon with areas along and east of I-35
continuing to see the highest rain chances. All activity should
finish by Wednesday night as most precipitation finally pushes off
to the east and out of our area. Thursday and Friday should be a
much drier days as southerly low level flow returns and with it the
possibility for some isolated streamer showers over the Coastal
plains on Friday. Temps should warm up nicely back into the mid 80s
on thursday and into the upper 80s by Friday. Our quieter and drier
weather is short lived as a trough out west begins to deepen helping
to bring us back into southwest flow. As a result, thunderstorms
appear possible for both Saturday and Sunday given the setup in
place.

&&

.AVIATION...
(18Z TAFS)
Issued at 1242 PM CDT Mon Apr 20 2026

A messy weather situation continues across most of the region with
a widely varied mix of lowered CIGs and VSBYs. A large area of RA
with isolated TSRA continues mostly northeast of a KERV to KSSF
line. This should persist today and tonight. Hi-res models have
struggled to capture the aviation impacts of this rain, so have
leaned towards the better performing statistical guidance in the
18Z TAFs. Overall confidence in forecast precision is low.
However, a general lowering trend in CIGs and VSBYs is likely
today, with widespread IFR to LIFR CIGs possible tonight. Models
have hinted at an increase in some TSRA mainly after 00Z, with
enough support to insert PROB30s at KAUS and KSAT. While the
overall expanse of rain should shift gradually east with time,
improvement of conditions could be quite slow, especially for
KAUS/KSAT/KSSF.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              57  69  63  82 /  80  80  40  50
Austin Bergstrom Intl Airport  58  69  63  81 /  80  80  40  50
New Braunfels Muni Airport     57  72  63  82 /  80  80  40  50
Burnet Muni Airport            55  66  60  79 /  90  80  30  30
Del Rio Intl Airport           59  78  67  83 /  60  10  30   0
Georgetown Muni Airport        57  67  62  80 /  80  80  40  40
Hondo Muni Airport             57  71  64  80 /  90  50  40  30
San Marcos Muni Airport        58  70  63  81 /  80  80  40  60
La Grange - Fayette Regional   59  72  63  81 /  80  80  40  60
San Antonio Intl Airport       59  72  65  82 /  80  70  40  50
Stinson Muni Airport           60  73  65  82 /  80  60  40  40

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&

SHORT TERM...CJM
LONG TERM....CJM
AVIATION...Tran