Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 39, NWS Austin/San Antonio, TX

July 9, 2021DeWitt County, Karnes County, Wilson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 9, 2021, 3:10 AM CDT for DeWitt County, Karnes County, Wilson County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 9, 2021, 3:10 AM CDT (08:10 UTC)
Expired: Jul 9, 2021, 6:15 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties DeWitt County, TX, Karnes County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 86 km from the middle of the area, began a volume at 08:09 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 00:00Z, 8.2 hours before the alert went out and 144 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: 1447 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 716 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 4 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

The text

As transmitted.

056 
WGUS54 KEWX 090810
FFWEWX
TXC123-255-493-091115-
/O.NEW.KEWX.FF.W.0039.210709T0810Z-210709T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
310 AM CDT Fri Jul 9 2021

The National Weather Service in Austin/San Antonio has issued a

* Flash Flood Warning for...
  Southwestern DeWitt County in south central Texas...
  Eastern Karnes County in south central Texas...
  East Central Wilson County in south central Texas...

* Until 615 AM CDT.

* At 310 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Yorktown, Kosciusko, Runge, Nordheim, Gillett, Cestohowa, Ecleto, 
  Helena, Cotton Patch, New Davy and Paweleville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 2911 9801 2917 9794 2921 9783 2916 9770
      2907 9759 2892 9743 2883 9755 2881 9757
      2878 9763 2875 9766 2874 9767 2905 9796

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

HAMPSHIRE

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, 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, 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

Flash Flood Warnings in Texas, 2021 Every flash flood warning 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.