Alert archive / Texas / Flash Flood Warnings in 2017

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

February 19, 2017Bexar County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Feb 19, 2017, 11:26 PM CST for Bexar County, Texas. It was in force for 4 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: Feb 19, 2017, 11:26 PM CST (05:26 UTC)
Expired: Feb 20, 2017, 3:00 AM CST
In force: 4 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Flood severity: None

County Bexar County, TX

The radar

The Austin/San Antonio radar (KEWX), 42 km from the middle of the area, began a volume at 05:30 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
Feb 20, 12:38 AM CST	FLASH FLOOD	San Antonio, TX	A NUMBER OF ROADS CLOSED DUE TO FLOODING INCLUDING S BLUE WING RD NORTH OF MICKEY...OLD FREDERICKSBURG RD NORTH OF LOST GAP...GROSENBACHER RD...AND MENGER RD AT FOSSIL CREEK. FLOODING OCCURRED BETWEEN 1238AM AND 233AM.

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, 5.4 hours before the alert went out and 230 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: 1800 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 663 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 9.8

Open this sounding in Storm Lab

The text

As transmitted.

564 
WGUS54 KEWX 200526
FFWEWX
TXC029-200730-
/O.NEW.KEWX.FF.W.0002.170220T0526Z-170220T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
1126 PM CST SUN FEB 19 2017

The National Weather Service in Austin San Antonio has issued a

* Flash Flood Warning for...
  Bexar County in south central Texas...

* Until 130 AM CST

* At 1126 PM CST, emergency management officials reported heavy rain
  across the warned area. Up to two inches of rain have already
  fallen. Flash flooding is already occurring.

* Some locations that will experience flooding include...
  San Antonio, Schertz, Universal City, Live Oak, Selma, Stinson
  Municipal Airport, San Antonio Int Ap, Randolph AFB, Leon Valley,
  Kirby, Helotes, Alamo Heights, Fair Oaks Ranch, Windcrest, Terrell
  Hills, Shavano Park, Hollywood Park, Olmos Park, St. Hedwig and
  Somerset.

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 2926 9878 2968 9880 2973 9861 2973 9844
      2971 9843 2973 9841 2968 9838 2967 9838
      2967 9836 2962 9834 2960 9831 2956 9830
      2954 9825 2956 9826 2945 9814 2913 9842

$$

MSL

2 follow-up statements

355 
WGUS74 KEWX 200658
FFSEWX

Flash Flood Statement
National Weather Service Austin/San Antonio TX
1258 AM CST MON FEB 20 2017

TXC029-200730-
/O.CON.KEWX.FF.W.0002.000000T0000Z-170220T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bexar TX-
1258 AM CST MON FEB 20 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM CST FOR
BEXAR COUNTY...

At 1254 AM CST, light to moderate rain continues. Up to two inches 
of rain have already fallen. More rainfall is moving into the area 
from the south and this could create additional flooding or 
prolong the current floding. Flash flooding will continue.

Some locations that will experience flooding include...
San Antonio, Schertz, Universal City, Live Oak, Selma, Stinson
Municipal Airport, San Antonio Int Ap, Randolph AFB, Leon Valley,
Kirby, Helotes, Alamo Heights, Fair Oaks Ranch, Windcrest, Terrell
Hills, Shavano Park, Hollywood Park, Olmos Park, St. Hedwig and
Somerset.

Additional rainfall amounts of one quarter to one half inch are 
possible in the warned area. A few locations could see up to one 
inch if heavier rainfall develops. 

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 2926 9878 2968 9880 2973 9861 2973 9844
      2971 9843 2973 9841 2968 9838 2967 9838
      2967 9836 2962 9834 2960 9831 2956 9830
      2954 9825 2956 9826 2945 9814 2913 9842

$$

MSL

335 
WGUS54 KEWX 200724
FFWEWX
TXC029-200900-
/O.EXT.KEWX.FF.W.0002.000000T0000Z-170220T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
124 AM CST MON FEB 20 2017

The National Weather Service in Austin San Antonio has extended the

* Flash Flood Warning for...
  Bexar County in south central Texas...

* Until 300 AM CST

* At 121 AM CST, Doppler radar indicated heavy rain across the warned
  area. Up to two inches of rain have already fallen. Flash flooding 
  is already occurring.

* Some locations that will experience flooding include...
  San Antonio, Schertz, Universal City, Live Oak, Selma, Stinson
  Municipal Airport, San Antonio Int Ap, Randolph AFB, Leon Valley,
  Kirby, Helotes, Alamo Heights, Fair Oaks Ranch, Windcrest, Terrell
  Hills, Shavano Park, Hollywood Park, Olmos Park, St. Hedwig and
  Somerset.

Additional rainfall amounts of one quarter to one half inch are 
possible in the warned area, with isolated amounts to one inch 
possible. This will prolong or could increase the current flash 
flooding.

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 2926 9878 2968 9880 2973 9861 2973 9844
      2971 9843 2973 9841 2968 9838 2967 9838
      2967 9836 2962 9834 2960 9831 2956 9830
      2954 9825 2956 9826 2945 9814 2913 9842

$$

MSL

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 19, 6:03 PM CST	Areal Flood Advisory	EWX	Edwards, Kinney, Maverick	3 hr
Feb 19, 6:29 PM CST	Severe Thunderstorm Warning	EWX	Edwards, Kinney	46 min
Feb 19, 6:33 PM CST	Special Weather Statement	EWX	Kinney	42 min
Feb 19, 7:08 PM CST	Special Weather Statement	EWX	Kinney, Maverick	52 min
Feb 19, 7:15 PM CST	Special Weather Statement	EWX	Real	45 min
Feb 19, 7:20 PM CST	Severe Thunderstorm Warning	EWX	Edwards, Real	55 min
Feb 19, 7:42 PM CST	Flash Flood Warning	EWX	Kinney, Maverick	3 hr
Feb 19, 7:57 PM CST	Severe Thunderstorm Warning	EWX	Edwards, Kerr, Real	33 min
Feb 19, 8:06 PM CST	Severe Thunderstorm Warning	EWX	Dimmit, Kinney, Maverick, Uvalde, Zavala	39 min
Feb 19, 8:09 PM CST	Special Weather Statement	EWX	Dimmit	51 min
Feb 19, 8:13 PM CST	Special Weather Statement	EWX	Kerr, Real	62 min
Feb 19, 8:42 PM CST	Special Weather Statement	EWX	Bandera, Frio, Medina	48 min
Feb 19, 9:10 PM CST	Severe Thunderstorm Warning	EWX	Medina	50 min
Feb 19, 9:31 PM CST	Special Weather Statement	EWX	Atascosa, Bandera, Bexar, Frio, Gillespie, Kendall and 1 more	59 min
Feb 19, 10:16 PM CST	Areal Flood Advisory	EWX	Bexar	3 hr
Feb 19, 10:26 PM CST	Special Weather Statement	EWX	Atascosa, Bexar, Comal, Guadalupe, Karnes, Wilson	64 min
Feb 19, 10:31 PM CST	Special Weather Statement	EWX	Blanco, Burnet, Hays, Travis, Williamson	59 min
Feb 19, 10:34 PM CST	Severe Thunderstorm Warning	EWX	Bexar, Comal, Guadalupe, Wilson	40 min
Feb 19, 10:39 PM CST	Tornado Warning	EWX	Bexar, Comal, Guadalupe	36 min
Feb 19, 10:56 PM CST	Severe Thunderstorm Warning	EWX	Bexar, Comal, Gonzales, Guadalupe, Hays, Wilson	42 min
Feb 19, 11:01 PM CST	Areal Flood Advisory	EWX	Bexar, Blanco, Comal, Kendall	119 min
Feb 19, 11:02 PM CST	Tornado Warning	EWX	Comal, Guadalupe	13 min
Feb 19, 11:22 PM CST	Areal Flood Advisory	EWX	Blanco, Burnet, Hays, Travis, Williamson	113 min
Feb 19, 11:29 PM CST	Tornado Warning	EWX	Bastrop, Caldwell, Hays, Travis	46 min
Feb 19, 11:31 PM CST	Tornado Warning	EWX	Caldwell, Guadalupe, Hays	29 min
Feb 19, 11:38 PM CST	Special Weather Statement	EWX	Burnet, Travis, Williamson	37 min
Feb 19, 11:40 PM CST	Areal Flood Advisory	EWX	Caldwell, Guadalupe, Hays, Travis	2 hr
Feb 19, 11:53 PM CST	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Hays, Travis	37 min
Feb 20, 12:05 AM CST	Tornado Warning	EWX	Bastrop, Travis	25 min
Feb 20, 12:19 AM CST	Areal Flood Advisory	EWX	Bastrop, Caldwell, Lee, Travis, Williamson	116 min
Feb 20, 12:22 AM CST	Severe Thunderstorm Warning	EWX	Bastrop, Lee, Travis, Williamson	53 min
Feb 20, 12:23 AM CST	Tornado Warning	EWX	Williamson	22 min
Feb 20, 12:40 AM CST	Special Weather Statement	EWX	Fayette, Gonzales	50 min
Feb 20, 1:01 AM CST	Special Weather Statement	EWX	Fayette, Lavaca, Lee	44 min
Feb 20, 1:17 AM CST	River Flood Warning	EWX	Bexar, Wilson	43 hr
Feb 20, 1:38 AM CST	Areal Flood Advisory	EWX	Bastrop, DeWitt, Fayette, Lavaca, Lee	112 min
Feb 20, 1:48 AM CST	Special Weather Statement	EWX	Fayette, Lavaca	42 min
Feb 20, 2:02 AM CST	Special Weather Statement	EWX	DeWitt, Gonzales, Guadalupe, Karnes, Wilson	73 min
Feb 20, 2:20 AM CST	Areal Flood Advisory	EWX	Atascosa, Guadalupe, Karnes, Wilson	115 min
Feb 20, 2:53 AM CST	Areal Flood Advisory	EWX	Bastrop, Caldwell, Fayette, Gonzales, Lee, Travis and 1 more	112 min
Feb 20, 3:14 AM CST	Areal Flood Advisory	EWX	Bexar	106 min
Feb 20, 3:35 AM CST	Areal Flood Advisory	EWX	Bastrop, DeWitt, Fayette, Karnes, Lavaca, Lee	3 hr
Feb 20, 9:58 AM CST	River Flood Warning	EWX	Karnes, Wilson	48 hr

Nearby

Flash Flood Warnings in Texas, 2017 Every flash flood warning in 2017

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.