Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 38, NWS Austin/San Antonio, TX

July 8, 2021Karnes County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 8, 2021, 11:01 PM CDT for Karnes County, Texas. It was in force for 5 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 8, 2021, 11:01 PM CDT (04:01 UTC)
Expired: Jul 9, 2021, 4:00 AM CDT
In force: 5 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Karnes County, TX

The radar

The Austin/San Antonio radar (KEWX), 107 km from the middle of the area, began a volume at 04:00 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.

What was reported inside it

Time	Report	Where	Remark
Jul 9, 12:09 AM CDT	FLASH FLOOD	Kenedy, TX	EMERGENCY MANAGER REPORTS SEVERAL ROADS CLOSED IN AND AROUND KENEDY.
Jul 9, 12:33 AM CDT	FLASH FLOOD	1 Nw Kenedy, TX	VIA PUBLIC: STREET/ROAD FLOODING; STREET/ROAD CLOSED; VEHICLES STRANDED IN AND AROUND KENEDY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 4.0 hours before the alert went out and 123 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.

233 
WGUS54 KEWX 090401
FFWEWX
TXC255-090700-
/O.NEW.KEWX.FF.W.0038.210709T0401Z-210709T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
1101 PM CDT Thu Jul 8 2021

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

* Flash Flood Warning for...
  Southeastern Karnes County in south central Texas...

* Until 200 AM CDT.

* At 1101 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen, especially near and south of Kenedy. Additional 
  rainfall amounts of 1 to 3 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...
  Kenedy, Karnes City and Choate.

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.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 2895 9786 2874 9767 2867 9778 2868 9779
      2867 9779 2867 9781 2867 9782 2868 9783
      2887 9798

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

$$

PLATT

2 follow-up statements

317 
WGUS74 KEWX 090513
FFSEWX

Flash Flood Statement
National Weather Service Austin/San Antonio TX
1213 AM CDT Fri Jul 9 2021

TXC255-090700-
/O.CON.KEWX.FF.W.0038.000000T0000Z-210709T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Karnes TX-
1213 AM CDT Fri Jul 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT EARLY THIS 
MORNING FOR SOUTHEASTERN KARNES COUNTY...

At 1213 AM CDT, emergency management reported several roads closed 
in and around Kenedy due to thunderstorms producing heavy rain 
across the warned area. Between 3 and 6 inches of rain have fallen. 
Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area. Flash flooding is ongoing.

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

SOURCE...Emergency management reported.

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

Some locations that will experience flash flooding include...
  Kenedy, Karnes City and Choate.

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.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 2895 9786 2874 9767 2867 9778 2868 9779
      2867 9779 2867 9781 2867 9782 2868 9783
      2887 9798

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

HAMPSHIRE

613 
WGUS54 KEWX 090632
FFWEWX
TXC255-090900-
/O.EXT.KEWX.FF.W.0038.000000T0000Z-210709T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Austin/San Antonio has extended the

* Flash Flood Warning for...
  Southeastern Karnes County in south central Texas...

* Until 400 AM CDT.

* At 132 AM CDT, emergency management reported thunderstorms 
  producing heavy rain across the warned area. Between 3 and 6 
  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...Emergency management reported.

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

* Some locations that will experience flash flooding include...
  Kenedy, Karnes City and Choate.

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.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 2895 9786 2874 9767 2867 9778 2868 9779
      2867 9779 2867 9781 2867 9782 2868 9783
      2887 9798

FLASH FLOOD...OBSERVED
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 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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.