Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 280, NWS Austin/San Antonio, TX

October 13, 2021Blanco County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at Oct 13, 2021, 8:35 PM CDT for Blanco County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Oct 13, 2021, 8:35 PM CDT (01:35 UTC)
Expired: Oct 13, 2021, 11:45 PM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Blanco County, TX

The radar

The Austin/San Antonio radar (KEWX), 72 km from the middle of the area, began a volume at 01:34 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

Corpus Christi, TX (KCRP), launched 00:00Z, 1.6 hours before the alert went out and 300 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: 1651 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 7.0

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 Oct 13, 7:36 PM CDT, 59 minutes earlier.

Area forecast discussion, Oct 13, 7:36 PM CDT, 59 minutes before

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Hazardous weather outlook, Oct 13, 3:37 AM CDT, 16 hours 58 minutes before

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
337 AM CDT Wed Oct 13 2021

TXZ171>173-183>194-202>209-217>225-228-140845-
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-
337 AM CDT Wed Oct 13 2021

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

.DAY ONE...Today And Tonight.

Scattered showers and thunderstorms will continue Wednesday.
The main event is currently forecast to arrive Wednesday evening
and continue into Thursday morning. There is a moderate risk for
excessive rainfall leading to flash flooding during this time
along and west of the I-35 corridor. An axis of 3-5 inches of
rainfall is currently forecast across the Hill Country and
southern Edwards Plateau, with isolated higher amounts up to 7
inches. 1-4 inches of rainfall is forecast along the Rio Grande
and I-35 corridor. A Flash Flood Watch is in effect roughly along
and west of the I-35 corridor. Rainfall amounts of less than 1
inch is forecast east of the watch area.

In addition, there is a very low but nonzero risk for a tornado or
perhaps some damaging winds late Wednesday afternoon through
Wednesday night, mainly over the western half of our region.

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

Scattered showers and thunderstorms will continue into Thursday
morning with the possibility of heavy rainfall leading to Flash
Flooding. Activity will be impacting areas of the I-35 corridor
and points eastward through the morning hours. Rainfall should end
west to east across the area by the afternoon hours Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to submit rainfall totals.

In the hours before

Special weather statement, Oct 13, 4:00 PM CDT, 4 hours 35 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
400 PM CDT Wed Oct 13 2021

TXZ202-203-217-218-132145-
Maverick TX-Uvalde TX-Kinney TX-Zavala TX-
400 PM CDT Wed Oct 13 2021

...A strong thunderstorm will impact portions of eastern Kinney,
northeastern Maverick, western Uvalde and northwestern Zavala
Counties through 445 PM CDT...

At 359 PM CDT, Doppler radar was tracking a strong thunderstorm near
Anacacho, or 11 miles southeast of Brackettville, moving northeast at
30 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Laguna, Dabney, Montell, Blewett, Cline, Garner State Park, Anacacho,
Reagan Wells and Turkey Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2904 10036 2928 10034 2961 10023 2962 9968
      2891 9996
TIME...MOT...LOC 2059Z 213DEG 26KT 2925 10024

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

CP

Special weather statement, Oct 13, 4:33 PM CDT, 4 hours 2 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
433 PM CDT Wed Oct 13 2021

TXZ185-203-132215-
Uvalde TX-Real TX-
433 PM CDT Wed Oct 13 2021

...Strong thunderstorms will impact portions of Uvalde and Real
Counties through 515 PM CDT...

At 432 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Barksdale to near Montell to near Laguna to 6
miles west of Uvalde Estates. Movement was northeast at 40 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Uvalde, Leakey, Camp Wood, Knippa, Laguna, Tuff, Rio Frio, Concan,
Vance, Uvalde Estates, Montell, Garner State Park, Reagan Wells and
Prade Ranch.

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 2962 10004 2963 10001 2971 10005 2972 10002
      2978 10003 2980 10001 2985 10003 2988 10002
      3008 9972 2997 9969 2991 9969 2991 9967
      2916 9947 2909 10000
TIME...MOT...LOC 2132Z 213DEG 36KT 2972 10006 2952 9997 2939 9993
2914 9993

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

CP

Special weather statement, Oct 13, 6:45 PM CDT, 1 hour 50 minutes before

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Special weather statement, Oct 13, 7:44 PM CDT, 51 minutes before

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Special weather statement, Oct 13, 8:21 PM CDT, 14 minutes before

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Special weather statement, Oct 13, 8:28 PM CDT, 7 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
Oct 13, 7:44 PM CDT	Special Weather Statement	EWX	Kendall	46 min
Oct 13, 7:53 PM CDT	Areal Flood Advisory	EWX	Bandera, Kendall, Kerr	3 hr
Oct 13, 8:05 PM CDT	Tornado Warning	EWX	Blanco, Comal, Kendall	25 min
Oct 13, 8:21 PM CDT	Special Weather Statement	EWX	Williamson	39 min
Oct 13, 8:28 PM CDT	Special Weather Statement	EWX	Comal, Hays	47 min
Oct 13, 8:55 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Blanco, Kendall	6 hr
Oct 13, 9:25 PM CDT	Areal Flood Advisory	EWX	Bexar, Comal, Hays	3 hr
Oct 13, 9:49 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Bexar, Comal	3 hr
Oct 13, 9:55 PM CDT	Areal Flood Advisory	EWX	Travis	3 hr
Oct 13, 10:24 PM CDT	Areal Flood Advisory	EWX	Williamson	3 hr
Oct 13, 10:38 PM CDT	Areal Flood Advisory	EWX	Hays, Travis	3 hr
Oct 13, 10:52 PM CDT	River Flood Warning	EWX	Blanco, Hays	3 hr
Oct 13, 11:00 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Hays	6 hr
Oct 13, 11:49 PM CDT	Areal Flood Advisory	EWX	Bastrop, Travis, Williamson	4 hr
Oct 13, 11:59 PM CDT	Areal Flood Advisory	EWX	Bexar, Caldwell, Comal, Guadalupe	4 hr
Oct 14, 12:46 AM CDT	Flash Flood Warning Considerable damage threat	EWX	Caldwell, Comal, Guadalupe, Hays	10 hr
Oct 14, 12:57 AM CDT	River Flood Warning	EWX	Hays	4 hr
Oct 14, 1:04 AM CDT	Flash Flood Warning	EWX	Bexar, Comal	4 hr
Oct 14, 1:11 AM CDT	Areal Flood Advisory	EWX	Caldwell, Gonzales, Guadalupe, Wilson	3 hr
Oct 14, 1:50 AM CDT	River Flood Warning	EWX	Comal, Guadalupe	7 hr
Oct 14, 2:04 AM CDT	Special Weather Statement	EWX	Gonzales	41 min
Oct 14, 2:39 AM CDT	Special Weather Statement	EWX	Gonzales	51 min
Oct 14, 2:48 AM CDT	Tornado Warning	EWX	Gonzales, Lavaca	27 min
Oct 14, 3:11 AM CDT	River Flood Warning	EWX	Comal, Guadalupe	4 hr
Oct 14, 3:17 AM CDT	Areal Flood Advisory	EWX	Bastrop, Fayette, Lee	3 hr
Oct 14, 3:19 AM CDT	Tornado Warning	EWX	Gonzales, Lavaca	26 min
Oct 14, 3:39 AM CDT	Tornado Warning	EWX	Fayette, Gonzales, Lavaca	36 min
Oct 14, 3:42 AM CDT	Flash Flood Warning Considerable damage threat	EWX	Caldwell, Gonzales, Guadalupe, Karnes, Lavaca, Wilson	7 hr
Oct 14, 4:13 AM CDT	River Flood Warning	EWX	Comal, Gonzales, Guadalupe	3 hr
Oct 14, 4:24 AM CDT	Severe Thunderstorm Warning	EWX	Fayette, Gonzales, Lavaca	66 min
Oct 14, 5:07 AM CDT	Flash Flood Warning Considerable damage threat	EWX	Fayette	5 hr
Oct 14, 5:10 AM CDT	Severe Thunderstorm Warning	EWX	Lavaca	21 min
Oct 14, 5:36 AM CDT	River Flood Warning	EWX	Caldwell, Hays	8 hr
Oct 14, 5:36 AM CDT	River Flood Warning	EWX	Caldwell, Gonzales	38 hr
Oct 14, 6:27 AM CDT	Flash Flood Warning Considerable damage threat	EWX	DeWitt, Karnes, Lavaca	6 hr
Oct 14, 7:15 AM CDT	River Flood Warning	EWX	Travis	6 hr
Oct 14, 7:19 AM CDT	River Flood Warning	EWX	Gonzales	3 days
Oct 14, 7:52 AM CDT	River Flood Warning	EWX	Guadalupe	3 hr
Oct 14, 8:23 AM CDT	River Flood Warning	EWX	Bexar	7 hr
Oct 14, 8:28 AM CDT	River Flood Warning	EWX	Bexar	21 hr
Oct 14, 8:28 AM CDT	River Flood Warning	EWX	Bexar, Wilson	29 hr
Oct 14, 8:29 AM CDT	River Flood Warning	EWX	Bexar	12 hr
Oct 14, 9:10 AM CDT	River Flood Warning	EWX	DeWitt	3 days
Oct 14, 9:11 AM CDT	River Flood Warning	EWX	DeWitt	5 days
Oct 14, 10:54 AM CDT	River Flood Warning	EWX	Karnes, Wilson	33 hr
Oct 14, 10:55 AM CDT	River Flood Warning	EWX	Karnes	45 hr

Nearby

Areal Flood Advisories in Texas, 2021 Every 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.