Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 232, NWS Austin/San Antonio, TX

August 5, 2021DeWitt County, Gonzales County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at Aug 5, 2021, 10:54 AM CDT for DeWitt County, Gonzales County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 5, 2021, 10:54 AM CDT (15:54 UTC)
Expired
Aug 5, 2021, 2:00 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

Counties DeWitt County, TX, Gonzales County, TX

The radar

The Austin/San Antonio radar (KEWX), 76 km from the middle of the area, began a volume at 15:57 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, 3.9 hours before the alert went out and 171 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 2021-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1826 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 2021-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 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
1826 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
819 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
-6 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 5:53 AM CDTAreal Flood AdvisoryEWXKinney, Uvalde4 hr
Aug 5, 5:58 AM CDTAreal Flood AdvisoryEWXFrio4 hr
Aug 5, 6:09 AM CDTAreal Flood AdvisoryEWXLee3 hr
Aug 5, 7:51 AM CDTAreal Flood AdvisoryEWXBexar, Medina3 hr
Aug 5, 9:35 AM CDTAreal Flood AdvisoryEWXDimmit, Maverick, Zavala3 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.