Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 67, NWS Austin/San Antonio, TX

May 24, 2021Hays County, Travis County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at May 24, 2021, 4:23 AM CDT for Hays County, Travis County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: May 24, 2021, 4:23 AM CDT (09:23 UTC)
Expired: May 24, 2021, 7:30 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Hays County, TX, Travis County, TX

The radar

The Austin/San Antonio radar (KEWX), 56 km from the middle of the area, began a volume at 09:25 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, 9.4 hours before the alert went out and 298 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: 786 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 1853 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -65 m²/s²
0-3 km storm-relative helicity: 62 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 May 24, 3:18 AM CDT, 1 hour 5 minutes earlier.

Area forecast discussion, May 24, 3:18 AM CDT, 1 hour 5 minutes before

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Hazardous weather outlook, May 24, 3:55 AM CDT, 28 minutes before

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
355 AM CDT Mon May 24 2021

TXZ171>173-183>194-202>209-217>225-228-250900-
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-
355 AM CDT Mon May 24 2021

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

.DAY ONE...Today And Tonight.

Locally heavy tropical downpours are expected again today for
areas mainly along and east of I-10/37 corridor. Localized
flooding may be possible, with the greatest concern focusing
across portions of the coastal plains.

A Flash Flood Watch remains in effect through this evening for
Fayette, Gonzales, DeWitt, and Lavaca counties, where additional
amounts of 1 to 2 inches of rainfall, with isolated higher amounts
up to 4 inches, could occur today, producing flooding.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Locally heavy tropical downpours are possible again Tuesday for
areas mainly along and east of highway 281. Localized flooding
may be possible, with the greatest concern focusing across
portions of the coastal plains.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report any localized and/or flash
flooding to the National Weather Service.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 24, 3:57 AM CDT	Areal Flood Advisory	EWX	Bexar, Kendall	3 hr
May 24, 8:18 AM CDT	Areal Flood Advisory	EWX	Bastrop	3 hr
May 24, 8:21 AM CDT	Areal Flood Advisory	EWX	Travis, Williamson	3 hr
May 24, 1:07 PM CDT	Areal Flood Advisory	EWX	Lee	3 hr
May 24, 1:21 PM CDT	Areal Flood Advisory	EWX	Bexar	114 min
May 24, 1:45 PM CDT	Areal Flood Advisory	EWX	Burnet, Williamson	2 hr
May 24, 3:29 PM CDT	Areal Flood Advisory	EWX	Bexar, Comal	3 hr
May 24, 3:44 PM CDT	Areal Flood Advisory	EWX	Fayette, Lee	3 hr
May 24, 4:12 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Fayette, Lee	3 hr
May 24, 4:30 PM CDT	Areal Flood Advisory	EWX	Williamson	112 min
May 24, 4:31 PM CDT	Areal Flood Advisory	EWX	Bastrop	111 min
May 24, 4:55 PM CDT	Special Weather Statement	EWX	Lee	35 min

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.