Alert archive / Texas / Areal Flood Advisories in 2026

Areal Flood Advisory 21, NWS Austin/San Antonio, TX

April 12, 2026Bexar County, Comal County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at Apr 12, 2026, 3:13 PM CDT for Bexar County, Comal County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Apr 12, 2026, 3:13 PM CDT (20:13 UTC)
Expired: Apr 12, 2026, 6:15 PM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Bexar County, TX, Comal County, TX

The radar

The Austin/San Antonio radar (KEWX), 37 km from the middle of the area, began a volume at 20:17 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.2 hours before the alert went out and 371 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 6 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 714 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this areal flood advisory went out at Apr 12, 1:02 PM CDT, 2 hours 11 minutes earlier.

Area forecast discussion, Apr 12, 1:02 PM CDT, 2 hours 11 minutes before

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In the hours before

Special weather statement, Apr 12, 9:27 AM CDT, 5 hours 46 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
927 AM CDT Sun Apr 12 2026

TXZ171-188-190-121530-
Blanco TX-Gillespie TX-Llano TX-
927 AM CDT Sun Apr 12 2026

...A strong thunderstorm will impact portions of northwestern Blanco,
central Gillespie and southeastern Llano Counties through 1030 AM
CDT...

At 927 AM CDT, Doppler radar was tracking a strong thunderstorm near
Tivydale, or 11 miles west of Fredericksburg, moving northeast at 40
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...
Fredericksburg, Round Mountain, Johnson City, Stonewall, Blowout,
Cain City, Tivydale, Sandy, Willow City, Rocky Hill, LBJ State Park,
Rocky Creek, Hye, Blumenthal, Eckert, Crabapple, Luckenbach, Harper,
and LBJ National Historical Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3029 9831 3014 9892 3014 9913 3025 9919
      3064 9851
TIME...MOT...LOC 1427Z 243DEG 34KT 3021 9907

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

05

Special weather statement, Apr 12, 12:25 PM CDT, 2 hours 48 minutes before

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Special weather statement, Apr 12, 1:07 PM CDT, 2 hours 6 minutes before

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Local storm report, Apr 12, 1:50 PM CDT, 1 hour 23 minutes before

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The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 11, 7:19 PM CDT	Special Weather Statement	EWX	Val Verde	56 min
Apr 11, 8:42 PM CDT	Special Weather Statement	EWX	Val Verde	63 min
Apr 11, 9:27 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Val Verde	3 hr
Apr 11, 9:44 PM CDT	Special Weather Statement	EWX	Val Verde	46 min
Apr 11, 9:50 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	55 min
Apr 11, 9:53 PM CDT	Areal Flood Advisory	EWX	Val Verde	4 hr
Apr 11, 10:11 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Val Verde	2 hr
Apr 11, 10:20 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	55 min
Apr 11, 10:22 PM CDT	Tornado Warning	EWX	Val Verde	23 min
Apr 11, 10:35 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Edwards, Kinney, Val Verde	4 hr
Apr 11, 10:46 PM CDT	Special Weather Statement	EWX	Edwards	44 min
Apr 11, 11:05 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kinney, Val Verde	41 min
Apr 11, 11:16 PM CDT	Special Weather Statement	EWX	Kinney	44 min
Apr 11, 11:46 PM CDT	Special Weather Statement	EWX	Edwards	44 min
Apr 12, 12:28 AM CDT	Areal Flood Advisory	EWX	Val Verde	92 min
Apr 12, 12:32 AM CDT	Areal Flood Advisory	EWX	Edwards, Kerr, Kinney, Real, Uvalde	4 hr
Apr 12, 12:44 AM CDT	Special Weather Statement	EWX	Edwards	61 min
Apr 12, 1:18 AM CDT	Special Weather Statement	EWX	Gillespie, Kerr, Llano	57 min
Apr 12, 1:57 AM CDT	Special Weather Statement	EWX	Burnet, Gillespie, Llano	63 min
Apr 12, 2:52 AM CDT	Areal Flood Advisory	EWX	Edwards, Kinney, Val Verde	5 hr
Apr 12, 2:52 AM CDT	Flash Flood Warning Considerable damage threat	EWX	Edwards, Val Verde	4 hr
Apr 12, 5:37 AM CDT	Special Weather Statement	EWX	Llano	53 min
Apr 12, 6:00 AM CDT	Special Weather Statement	EWX	Kinney	45 min
Apr 12, 6:38 AM CDT	Special Weather Statement	EWX	Kinney	52 min
Apr 12, 7:14 AM CDT	Special Weather Statement	EWX	Real	46 min
Apr 12, 7:27 AM CDT	Special Weather Statement	EWX	Kinney	48 min
Apr 12, 7:55 AM CDT	Special Weather Statement	EWX	Kerr, Real	50 min
Apr 12, 8:38 AM CDT	Special Weather Statement	EWX	Gonzales	52 min
Apr 12, 8:43 AM CDT	Special Weather Statement	EWX	Kerr	47 min
Apr 12, 9:08 AM CDT	Special Weather Statement	EWX	Frio	67 min
Apr 12, 9:27 AM CDT	Special Weather Statement	EWX	Gillespie	63 min
Apr 12, 10:11 AM CDT	Flood Watch	EWX	Bastrop, Caldwell, Comal, DeWitt, Fayette, Gonzales and 6 more	11 hr
Apr 12, 11:06 AM CDT	Areal Flood Advisory	EWX	DeWitt, Fayette, Gonzales, Lavaca	3 hr
Apr 12, 11:36 AM CDT	Flash Flood Warning Considerable damage threat	EWX	DeWitt, Gonzales, Lavaca	7 hr
Apr 12, 12:09 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Fayette, Gonzales, Lavaca	7 hr
Apr 12, 12:25 PM CDT	Special Weather Statement	EWX	Lavaca	50 min
Apr 12, 1:07 PM CDT	Special Weather Statement	EWX	Fayette	68 min
Apr 12, 1:36 PM CDT	Areal Flood Advisory	EWX	Fayette	3 hr
Apr 12, 4:23 PM CDT	Areal Flood Advisory	EWX	Gonzales	3 hr
Apr 12, 4:46 PM CDT	Tornado Warning	EWX	Burnet	14 min
Apr 12, 5:42 PM CDT	Special Weather Statement	EWX	Fayette	48 min

Nearby

Areal Flood Advisories in Texas, 2026 Every areal flood advisory in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.