Alert archive / Texas / Areal Flood Advisories in 2021
Areal Flood Advisory 264, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this areal flood advisory at Sep 29, 2021, 6:25 AM CDT for Bandera County, Bexar County, Medina County, Texas. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Sep 29, 2021, 6:25 AM CDT (11:25 UTC)
- Expired
- Sep 29, 2021, 9:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
Counties Bandera County, TX, Bexar County, TX, Medina County, TX
The radar
The Austin/San Antonio radar (KEWX), 92 km from the middle of the area, began a volume at 11:29 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
Del Rio, TX (KDRT), launched 00:00Z, 11.4 hours before the alert went out and 183 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.
- Mixed-layer CAPE
- 1438 J/kg
- Mixed-layer CIN
- -118 J/kg
- Mixed-layer LCL
- 1769 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Sep 29, 4:23 AM CDT, 2 hours 2 minutes earlier.
Area forecast discussion, Sep 29, 4:23 AM CDT, 2 hours 2 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Hazardous weather outlook, Sep 29, 4:35 AM CDT, 1 hour 50 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>In the hours before
Special weather statement, Sep 29, 12:27 AM CDT, 5 hours 58 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
1227 AM CDT Wed Sep 29 2021
TXZ205-207-221-223-224-290615-
Guadalupe TX-Bexar TX-De Witt TX-Gonzales TX-Wilson TX-
1227 AM CDT Wed Sep 29 2021
...Strong thunderstorms will impact portions of north central DeWitt,
southern Guadalupe, Gonzales, northeastern Wilson and east central
Bexar Counties through 115 AM CDT...
At 1226 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Gonzales to La Vernia. Movement was southeast
at 25 mph.
HAZARD...Wind gusts up to 50 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...
Seguin, Gonzales, Stockdale, Nixon, St. Hedwig, La Vernia, Smiley,
New Berlin, Pandora, Cheapside, Sutherland Springs, Hochheim, Palmeto
State Park, Zuehl, Leesville, Oak Forest, Belmont, Cost, Ottine and
Monthalia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 2921 9772 2922 9773 2921 9775 2916 9804
2945 9825 2957 9793 2963 9751 2930 9716
TIME...MOT...LOC 0526Z 300DEG 24KT 2949 9746 2936 9812
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
MOLocal storm report, Sep 29, 1:17 AM CDT, 5 hours 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
117 AM CDT WED SEP 29 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1253 AM TSTM WND GST 2 SE UNIVERSAL CITY 29.53N 98.29W
09/29/2021 M59 MPH BEXAR TX ASOS
THE KRND ASOS REPORTED A WIND GUST OF 59
MPH.
&&
EMPSpecial weather statement, Sep 29, 2:28 AM CDT, 3 hours 57 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
228 AM CDT Wed Sep 29 2021
TXZ188-190-290815-
Blanco TX-Gillespie TX-
228 AM CDT Wed Sep 29 2021
...A strong thunderstorm will impact portions of northern Blanco and
east central Gillespie Counties through 315 AM CDT...
At 227 AM CDT, Doppler radar was tracking a strong thunderstorm near
Willow City, or 8 miles northeast of Fredericksburg, moving east at
30 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...
Round Mountain, Johnson City, Stonewall, Sandy, Pedernales Falls
State Park, Willow City and LBJ National Historical Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3048 9831 3029 9823 3023 9876 3038 9881
3049 9836
TIME...MOT...LOC 0727Z 256DEG 26KT 3033 9875
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
MOSpecial weather statement, Sep 29, 3:00 AM CDT, 3 hours 25 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
300 AM CDT Wed Sep 29 2021
TXZ185-186-290845-
Kerr TX-Real TX-
300 AM CDT Wed Sep 29 2021
...A strong thunderstorm will impact portions of northwestern Kerr
and northeastern Real Counties through 345 AM CDT...
At 300 AM CDT, Doppler radar was tracking a strong thunderstorm 14
miles west of Kerr Wildlife Management Area, or 24 miles north of
Leakey, 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...
Kerr Wildlife Management Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3028 9947 2998 9941 2997 9981 3008 9983
3008 9976 3018 9975
TIME...MOT...LOC 0800Z 261DEG 10KT 3008 9975
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
MOSpecial weather statement, Sep 29, 3:44 AM CDT, 2 hours 41 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
344 AM CDT Wed Sep 29 2021
TXZ187-204-290930-
Medina TX-Bandera TX-
344 AM CDT Wed Sep 29 2021
...A strong thunderstorm will impact portions of northwestern Medina
and southeastern Bandera Counties through 430 AM CDT...
At 344 AM CDT, Doppler radar was tracking a strong thunderstorm 10
miles north of D'Hanis, or 11 miles northwest of Hondo, moving
northeast at 20 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...
Bandera, Lakehills, Hill Country State Natural Area and Lake Medina
Shores.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 2946 9941 2947 9941 2980 9916 2961 9890
2937 9924
TIME...MOT...LOC 0844Z 212DEG 19KT 2948 9929
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
MOThe office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 7:01 PM CDT | Special Weather Statement | EWX | Gonzales | 44 min |
| Sep 28, 7:34 PM CDT | Special Weather Statement | EWX | Mason | 26 min |
| Sep 28, 7:45 PM CDT | Severe Thunderstorm Warning | EWX | Williamson | 37 min |
| Sep 28, 7:57 PM CDT | Special Weather Statement | EWX | Travis | 48 min |
| Sep 28, 8:43 PM CDT | Areal Flood Advisory | EWX | Travis, Williamson | 3 hr |
| Sep 28, 8:44 PM CDT | Areal Flood Advisory | EWX | Gillespie | 4 hr |
| Sep 28, 9:04 PM CDT | Areal Flood Advisory | EWX | Zavala | 3 hr |
| Sep 28, 9:10 PM CDT | Areal Flood Advisory | EWX | Williamson | 3 hr |
| Sep 28, 9:12 PM CDT | Special Weather Statement | EWX | Bexar | 48 min |
| Sep 28, 9:29 PM CDT | Special Weather Statement | EWX | Bandera | 46 min |
| Sep 28, 9:40 PM CDT | Special Weather Statement | EWX | Hays | 50 min |
| Sep 28, 9:47 PM CDT | Areal Flood Advisory | EWX | Lee, Travis, Williamson | 3 hr |
| Sep 28, 9:52 PM CDT | Areal Flood Advisory | EWX | Bexar | 3 hr |
| Sep 28, 9:58 PM CDT | Areal Flood Advisory | EWX | Comal, Hays, Kendall, Travis | 3 hr |
| Sep 28, 10:10 PM CDT | Special Weather Statement | EWX | Kendall | 50 min |
| Sep 28, 10:13 PM CDT | Areal Flood Advisory | EWX | Bandera | 3 hr |
| Sep 28, 10:20 PM CDT | Special Weather Statement | EWX | Kendall | 40 min |
| Sep 28, 10:40 PM CDT | Special Weather Statement | EWX | Kerr | 50 min |
| Sep 28, 11:09 PM CDT | Special Weather Statement | EWX | Comal | 51 min |
| Sep 28, 11:19 PM CDT | Special Weather Statement | EWX | Comal, Guadalupe | 41 min |
| Sep 28, 11:23 PM CDT | Flash Flood Warning | EWX | Comal, Hays | 3 hr |
| Sep 28, 11:36 PM CDT | Areal Flood Advisory | EWX | Bastrop, Caldwell, Comal, Guadalupe, Hays, Travis | 3 hr |
| Sep 28, 11:49 PM CDT | Flash Flood Warning | EWX | Caldwell, Comal, Guadalupe, Hays | 5 hr |
| Sep 29, 12:27 AM CDT | Special Weather Statement | EWX | Gonzales | 48 min |
| Sep 29, 12:37 AM CDT | Areal Flood Advisory | EWX | Bastrop, Caldwell, Fayette, Gonzales, Guadalupe, Lee | 3 hr |
| Sep 29, 12:43 AM CDT | Areal Flood Advisory | EWX | Bexar, Comal, Gonzales, Guadalupe | 3 hr |
| Sep 29, 1:23 AM CDT | Flash Flood Warning | EWX | Bexar, Comal, Guadalupe | 4 hr |
| Sep 29, 1:34 AM CDT | Areal Flood Advisory | EWX | Gillespie | 3 hr |
| Sep 29, 2:05 AM CDT | Areal Flood Advisory | EWX | DeWitt, Fayette, Gonzales, Karnes, Lavaca, Wilson | 4 hr |
| Sep 29, 2:28 AM CDT | Special Weather Statement | EWX | Blanco | 47 min |
| Sep 29, 3:00 AM CDT | Special Weather Statement | EWX | Kerr | 45 min |
| Sep 29, 3:21 AM CDT | Severe Thunderstorm Warning | EWX | Gillespie, Kerr, Real | 42 min |
| Sep 29, 3:44 AM CDT | Special Weather Statement | EWX | Bandera | 46 min |
| Sep 29, 4:15 AM CDT | Areal Flood Advisory | EWX | Bandera, Kendall, Kerr | 4 hr |
Nearby
Areal Flood Advisories in Texas, 2021Every areal flood advisory in 2021
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.