Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 178, NWS Austin/San Antonio, TX

July 9, 2021Karnes County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at Jul 9, 2021, 4:14 AM CDT for Karnes County, Texas. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Jul 9, 2021, 4:14 AM CDT (09:14 UTC)
Expired: Jul 9, 2021, 8:15 AM CDT
In force: 4 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Karnes County, TX

The radar

The Austin/San Antonio radar (KEWX), 90 km from the middle of the area, began a volume at 09:15 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

Brownsville Intl, TX (KBRO), launched 00:00Z, 9.2 hours before the alert went out and 337 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: 1544 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 707 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 24 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, 3:33 AM CDT, 41 minutes earlier.

Area forecast discussion, Jul 9, 3:33 AM CDT, 41 minutes before

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Hazardous weather outlook, Jul 9, 3:21 AM CDT, 53 minutes before

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In the hours before

Local storm report, Jul 9, 12:09 AM CDT, 4 hours 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1209 AM CDT FRI JUL 9 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1209 AM     FLASH FLOOD      KENEDY                  28.82N 97.84W
07/09/2021                   KARNES             TX   EMERGENCY MNGR

            EMERGENCY MANAGER REPORTS SEVERAL ROADS
            CLOSED IN AND AROUND KENEDY.

&&

HAMPSHIRE

Local storm report, Jul 9, 12:42 AM CDT, 3 hours 32 minutes before

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    <section class="card" role="status" aria-live="polite">
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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, 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, 2:29 PM CDT	Areal Flood Advisory	EWX	Dimmit, Frio, Zavala	3 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.