Alert archive / Texas / Flash Flood Warnings in 2020

Flash Flood Warning 2, NWS Austin/San Antonio, TX

April 3, 2020Hays County, Travis County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Apr 3, 2020, 4:30 PM CDT for Hays County, Travis County, Texas. It was in force for 3 hr. 1 report 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: Apr 3, 2020, 4:30 PM CDT (21:30 UTC)
Expired: Apr 3, 2020, 7:30 PM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Hays County, TX, Travis County, TX

The radar

The Austin/San Antonio radar (KEWX), 37 km from the middle of the area, began a volume at 21:29 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
Apr 3, 4:54 PM CDT	FLASH FLOOD	3 E Kyle, TX	STREAM GAUGES SHOWING SEVERAL FEET OF WATER OVER THE ROAD ON THE EAST SIDE OF KYLE ON COTTON GIN ROAD AND BUNTON LANE.

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 12:00Z, 9.5 hours before the alert went out and 261 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: 1758 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: -36 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted.

627 
WGUS54 KEWX 032130
FFWEWX
TXC209-453-040030-
/O.NEW.KEWX.FF.W.0002.200403T2130Z-200404T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
430 PM CDT Fri Apr 3 2020

The National Weather Service in Austin San Antonio has issued a

* Flash Flood Warning for...
  Hays County in south central Texas...
  Southern Travis County in south central Texas...

* Until 730 PM CDT.

* At 428 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 3 inches of rain has 
  fallen in the past hour with more rainfall expected. Flash 
  flooding is ongoing or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Heavy rain producing 
           flash flooding.

  SOURCE...Radar indicated.

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

* Some locations that will experience flooding include...
  Austin, San Marcos, Kyle, Buda, Dripping Springs, Wimberley,
  Tanglewood Forest, Austin Bergstrom Int Airport, Lakeway, Bee Cave,
  West Lake Hills, The Hills, Woodcreek, Rollingwood, Uhland, Mustang
  Ridge, Niederwald, Bear Creek, Barton Creek and Henly.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3019 9751 2999 9776 2994 9780 2988 9789
      2986 9790 2986 9788 2976 9800 2985 9803
      3004 9830 3027 9821 3043 9813

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

$$

BMW

1 follow-up statement

023 
WGUS74 KEWX 040029
FFSEWX

Flash Flood Statement
National Weather Service Austin/San Antonio TX
729 PM CDT Fri Apr 3 2020

TXC209-453-040038-
/O.EXP.KEWX.FF.W.0002.000000T0000Z-200404T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hays TX-Travis TX-
729 PM CDT Fri Apr 3 2020

...THE FLASH FLOOD WARNING FOR HAYS AND SOUTHERN TRAVIS COUNTIES WILL
EXPIRE AT 730 PM CDT...

The heavy rain has ended and water have begun to recede. Please 
continue to heed any remaining road closures.

LAT...LON 3019 9751 2999 9776 2994 9780 2988 9789
      2986 9790 2986 9788 2976 9800 2985 9803
      3004 9830 3027 9821 3043 9813

$$

BMW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 11:43 AM CDT	Special Weather Statement	EWX	Val Verde	62 min
Apr 3, 12:13 PM CDT	Special Weather Statement	EWX	Kinney	62 min
Apr 3, 12:32 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	58 min
Apr 3, 12:59 PM CDT	Special Weather Statement	EWX	Edwards	46 min
Apr 3, 1:00 PM CDT	Special Weather Statement	EWX	Val Verde	45 min
Apr 3, 1:06 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Val Verde	54 min
Apr 3, 1:12 PM CDT	Special Weather Statement	EWX	Kinney	63 min
Apr 3, 1:13 PM CDT	Special Weather Statement	EWX	Val Verde	62 min
Apr 3, 1:17 PM CDT	Special Weather Statement	EWX	Zavala	58 min
Apr 3, 1:18 PM CDT	Special Weather Statement	EWX	Maverick	57 min
Apr 3, 1:26 PM CDT	Severe Thunderstorm Warning	EWX	Maverick, Zavala	52 min
Apr 3, 1:44 PM CDT	Flash Flood Watch	EWX	Bandera, Bastrop, Bexar, Blanco, Caldwell, Comal and 12 more	7 hr
Apr 3, 1:54 PM CDT	Special Weather Statement	EWX	Edwards	66 min
Apr 3, 2:35 PM CDT	Areal Flood Advisory	EWX	Gillespie, Llano	3 hr
Apr 3, 3:08 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Blanco, Gillespie, Kendall	3 hr
Apr 3, 3:13 PM CDT	Special Weather Statement	EWX	Bastrop	62 min
Apr 3, 3:25 PM CDT	Special Weather Statement	EWX	Frio	50 min
Apr 3, 3:36 PM CDT	Areal Flood Advisory	EWX	Comal, Hays, Travis	3 hr
Apr 3, 3:43 PM CDT	Areal Flood Advisory	EWX	Bandera, Edwards, Kerr, Real	3 hr
Apr 3, 4:17 PM CDT	Special Weather Statement	EWX	Caldwell	43 min
Apr 3, 4:25 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Guadalupe, Hays, Travis	33 min
Apr 3, 4:55 PM CDT	Areal Flood Advisory	EWX	Bastrop, Caldwell	3 hr
Apr 3, 5:17 PM CDT	Special Weather Statement	EWX	Dimmit	58 min
Apr 3, 5:28 PM CDT	Special Weather Statement	EWX	Gonzales	47 min
Apr 3, 5:36 PM CDT	Severe Thunderstorm Warning	EWX	Gonzales	18 min
Apr 3, 6:11 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit	49 min

Nearby

Flash Flood Warnings in Texas, 2020 Every flash flood warning in 2020

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.