Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 182, NWS Austin/San Antonio, TX

July 9, 2021Dimmit County, Frio County, Zavala County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at Jul 9, 2021, 2:29 PM CDT for Dimmit County, Frio County, Zavala County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jul 9, 2021, 2:29 PM CDT (19:29 UTC)
Expired: Jul 9, 2021, 5:30 PM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Dimmit County, TX, Frio County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 95 km from the middle of the area, began a volume at 19:30 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, 7.5 hours before the alert went out and 242 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: 994 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 646 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 7 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 9, 12:18 PM CDT, 2 hours 11 minutes earlier.

Area forecast discussion, Jul 9, 12:18 PM CDT, 2 hours 11 minutes before

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Hazardous weather outlook, Jul 9, 3:21 AM CDT, 11 hours 8 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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
Jul 8, 9:47 PM CDT	Areal Flood Advisory	EWX	DeWitt, Karnes	6 hr
Jul 8, 10:46 PM CDT	Areal Flood Advisory	EWX	Karnes	5 hr
Jul 8, 11:01 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Karnes	5 hr
Jul 9, 3:10 AM CDT	Flash Flood Warning Considerable damage threat	EWX	DeWitt, Karnes, Wilson	3 hr
Jul 9, 4:14 AM CDT	Areal Flood Advisory	EWX	Karnes	4 hr
Jul 9, 11:17 AM CDT	Areal Flood Advisory	EWX	DeWitt, Gonzales	5 hr
Jul 9, 11:19 AM CDT	Areal Flood Advisory	EWX	DeWitt, Lavaca	5 hr
Jul 9, 2:10 PM CDT	Areal Flood Advisory	EWX	Bexar, Comal, Guadalupe, Wilson	4 hr
Jul 9, 3:26 PM CDT	Areal Flood Advisory	EWX	Atascosa, Bexar	3 hr
Jul 9, 4:25 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Atascosa, Bexar	3 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.