Alert archive / Texas / Flash Flood Warnings in 2020

Flash Flood Warning 7, NWS Austin/San Antonio, TX

May 15, 2020Kendall County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 15, 2020, 10:39 PM CDT for Kendall 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: May 15, 2020, 10:39 PM CDT (03:39 UTC)
Expired: May 16, 2020, 1:45 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Kendall County, TX

The radar

The Austin/San Antonio radar (KEWX), 64 km from the middle of the area, began a volume at 03:40 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

Del Rio, TX (KDRT), launched 00:00Z, 3.7 hours before the alert went out and 225 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: 4115 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1207 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.6

Open this sounding in Storm Lab

The text

As transmitted.

601 
WGUS54 KEWX 160339
FFWEWX
TXC259-160645-
/O.NEW.KEWX.FF.W.0007.200516T0339Z-200516T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
1039 PM CDT Fri May 15 2020

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

* Flash Flood Warning for...
  Northeastern Kendall County in south central Texas...

* Until 145 AM CDT.

* At 1039 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

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

  SOURCE...Doppler radar.

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

* Some locations that will experience flash flooding include...
  Sisterdale, Kendalia, Waring, Bergheim, Guadalupe River State 
  Park, Spring Branch and Crown.

Additional rainfall amounts up to 1 inch are possible in the warned 
area.

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 2982 9855 2995 9881 3014 9881 3014 9859
      2994 9841

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

$$

BMW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 7:23 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Val Verde	52 min
May 15, 7:25 PM CDT	Special Weather Statement	EWX	Bastrop	35 min
May 15, 7:51 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr, Real	54 min
May 15, 7:56 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Maverick	64 min
May 15, 8:04 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Maverick, Uvalde, Zavala	56 min
May 15, 8:05 PM CDT	Special Weather Statement	EWX	Travis	25 min
May 15, 8:06 PM CDT	Special Weather Statement	EWX	Comal	24 min
May 15, 8:13 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Edwards, Kerr, Real, Uvalde	62 min
May 15, 8:27 PM CDT	Areal Flood Advisory	EWX	Bastrop, Travis	3 hr
May 15, 8:32 PM CDT	Special Weather Statement	EWX	Travis	43 min
May 15, 8:33 PM CDT	Special Weather Statement	EWX	Blanco	42 min
May 15, 8:53 PM CDT	Special Weather Statement	EWX	Blanco	52 min
May 15, 8:56 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina, Uvalde, Zavala	64 min
May 15, 8:58 PM CDT	Areal Flood Advisory	EWX	Blanco, Comal, Hays, Kendall	4 hr
May 15, 9:04 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Maverick, Zavala	56 min
May 15, 9:09 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Kendall	66 min
May 15, 9:12 PM CDT	Tornado Warning	EWX	Zavala	18 min
May 15, 9:21 PM CDT	Areal Flood Advisory	EWX	Bandera, Kerr, Real	114 min
May 15, 9:29 PM CDT	Special Weather Statement	EWX	Travis	46 min
May 15, 9:32 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Bexar, Kendall, Kerr	36 min
May 15, 9:34 PM CDT	Areal Flood Advisory	EWX	Travis	116 min
May 15, 9:45 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Travis	3 hr
May 15, 9:54 PM CDT	Areal Flood Advisory	EWX	Bandera, Blanco, Gillespie, Kendall, Kerr	3 hr
May 15, 9:54 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Bexar, Frio, Medina, Zavala	66 min
May 15, 9:57 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Zavala	63 min
May 15, 9:59 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kendall	14 min
May 15, 10:00 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Maverick	60 min
May 15, 10:13 PM CDT	Areal Flood Advisory	EWX	Zavala	2 hr
May 15, 10:31 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Blanco, Burnet, Comal, Guadalupe, Hays and 5 more	59 min
May 15, 10:53 PM CDT	Areal Flood Advisory	EWX	Bandera, Bexar, Comal, Guadalupe, Medina	3 hr
May 15, 10:55 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Bexar, Frio, Karnes, Medina, Wilson	65 min
May 15, 10:56 PM CDT	Areal Flood Advisory	EWX	Blanco, Burnet, Llano	3 hr
May 15, 10:58 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit	16 min
May 15, 11:28 PM CDT	Special Weather Statement	EWX	Bastrop, Caldwell, Guadalupe, Hays, Travis, Williamson	47 min
May 15, 11:31 PM CDT	Areal Flood Advisory	EWX	Atascosa, Frio	3 hr
May 15, 11:34 PM CDT	Areal Flood Advisory	EWX	Hays, Travis, Williamson	3 hr
May 15, 11:54 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, DeWitt, Gonzales, Karnes, Wilson	66 min
May 16, 12:08 AM CDT	Special Weather Statement	EWX	Bastrop, Caldwell, Gonzales, Guadalupe, Travis, Williamson	52 min
May 16, 12:27 AM CDT	Severe Thunderstorm Warning	EWX	DeWitt, Gonzales, Lavaca	63 min
May 16, 12:29 AM CDT	Areal Flood Advisory	EWX	Caldwell, DeWitt, Gonzales, Guadalupe, Karnes, Lavaca and 1 more	3 hr
May 16, 12:45 AM CDT	Special Weather Statement	EWX	Williamson	30 min
May 16, 12:56 AM CDT	Severe Thunderstorm Warning	EWX	DeWitt, Lavaca	46 min
May 16, 1:00 AM CDT	Areal Flood Advisory	EWX	Bastrop, Fayette, Lee	3 hr
May 16, 1:25 AM CDT	Special Weather Statement	EWX	Lavaca	50 min
May 16, 2:57 AM CDT	Areal Flood Advisory	EWX	Travis	3 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.