Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 152, NWS Austin/San Antonio, TX

July 3, 2021Kendall County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at Jul 3, 2021, 6:30 PM CDT for Kendall County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 3, 2021, 6:30 PM CDT (23:30 UTC)
Expired
Jul 3, 2021, 9:30 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

County Kendall County, TX

The radar

The Austin/San Antonio radar (KEWX), 71 km from the middle of the area, began a volume at 23:30 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 12:00Z, 11.5 hours before the alert went out and 280 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-pSkew-T log-p diagram, Corpus Christi, TX at 12:00Z on 2021-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1260 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Corpus Christi, TX at 12:00Z on 2021-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -46 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1260 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
762 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-46 m²/s²
0-3 km storm-relative helicity
-4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jul 3, 6:04 PM CDT, 26 minutes earlier.

Area forecast discussion, Jul 3, 6:04 PM CDT, 26 minutes before
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Hazardous weather outlook, Jul 3, 3:09 AM CDT, 15 hours 21 minutes before
Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
309 AM CDT Sat Jul 3 2021

TXZ171>173-183>194-202>209-217>225-228-040900-
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-
309 AM CDT Sat Jul 3 2021

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

.DAY ONE...Today And Tonight.

Scattered storms today, mainly during the afternoon and evening.
Cloud to ground lightning will be possible in and near any
storms. In addition, a few storms could produce localized, minor
flooding as well as gusty winds up to 50 mph.

No other hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Scattered storms are forecast Sunday through Friday, especially
in the afternoon and evening hours. Cloud to ground lightning will
be possible in and near any storms. In addition, a few storms
could produce localized, minor flooding as well as gusty winds up
to 50 mph.

No other hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

In the hours before

Special weather statement, Jul 3, 2:12 PM CDT, 4 hours 18 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
212 PM CDT Sat Jul 3 2021

TXZ191-208-032000-
Caldwell TX-Hays TX-
212 PM CDT Sat Jul 3 2021

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL CALDWELL AND
SOUTHEASTERN HAYS COUNTIES UNTIL 300 PM CDT...

At 212 PM CDT, Doppler radar was tracking a strong thunderstorm near
Wimberley, moving east at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
San Marcos, Kyle, Wimberley, Woodcreek, Martindale, Uhland, San
Marcos Regional Airport and Reedville.

LAT...LON 3002 9780 2983 9780 2983 9785 2985 9786
      2985 9788 2984 9790 2984 9803 2991 9812
      3003 9811
TIME...MOT...LOC 1912Z 273DEG 10KT 2994 9803

KCW
Special weather statement, Jul 3, 2:37 PM CDT, 3 hours 53 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
237 PM CDT Sat Jul 3 2021

TXZ193-194-209-032030-
Bastrop TX-Fayette TX-Lee TX-
237 PM CDT Sat Jul 3 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BASTROP...SOUTH
CENTRAL LEE AND NORTHWESTERN FAYETTE COUNTIES UNTIL 330 PM CDT...

At 237 PM CDT, Doppler radar was tracking a strong thunderstorm over
Paige, or 8 miles west of Giddings, moving south at 15 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Giddings, Smithville, Paige, Circle D-KC Estates, Serbin, Northrup,
Loebau, Rabbs Prairie, Warda, Buescher State Park, Hills, West Point,
Lincoln, Winchester, Kirtley, Nechanitz, Manheim and Bastrop State
Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3026 9725 3032 9691 2999 9677 2990 9716
TIME...MOT...LOC 1937Z 343DEG 12KT 3021 9707

KCW

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 2:12 PM CDTSpecial Weather StatementEWXHays48 min
Jul 3, 2:37 PM CDTSpecial Weather StatementEWXLee53 min
Jul 3, 4:14 PM CDTAreal Flood AdvisoryEWXBexar3 hr
Jul 3, 4:19 PM CDTAreal Flood AdvisoryEWXBastrop, Fayette, Lee3 hr
Jul 3, 5:51 PM CDTAreal Flood AdvisoryEWXDeWitt, Lavaca3 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.