Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 1, NWS Austin/San Antonio, TX

January 25, 2012Bexar County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jan 25, 2012, 2:00 AM CST for Bexar County, Texas. It was in force for 6 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: Jan 25, 2012, 2:00 AM CST (08:00 UTC)
Expired: Jan 25, 2012, 8:00 AM CST
In force: 6 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), 56 km from the middle of the area, began a volume at 08:02 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
Jan 25, 2:12 AM CST	FLASH FLOOD	San Antonio, TX	MULTIPLE STREETS CLOSED DUE TO FLOODING IN SAN ANTONIO VIA PUBLIC WORKS WEBSITE.

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, 8.0 hours before the alert went out and 220 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: 1865 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 260 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 9.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

179 
WGUS54 KEWX 250800
FFWEWX
TXC029-251100-
/O.NEW.KEWX.FF.W.0001.120125T0800Z-120125T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
200 AM CST WED JAN 25 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BEXAR COUNTY...

* UNTIL 500 AM CST.

* AT 159 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE     
  FLASH FLOODING ACROSS THE WARNED AREA. A NUMBER OF ROADS IN BEXAR  
  COUNTY ARE CLOSED DUE TO FLOODING. STINSON MUNICIPAL AIRPORT HAS   
  RECEIVED 2.18 INCHES OF RAIN IN THE PAST HOUR.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SAN
  ANTONIO...UNIVERSAL CITY...ALAMO HEIGHTS...CHINA GROVE...CROSS
  MOUNTAIN...HELOTES...HILL COUNTRY VILLA...HOLLYWOOD PARK...KIRBY...
  LACKLAND AFB...LEON SPRINGS...LEON VALLEY...LIVE OAK...OLMOS
  PARK...SEA WORLD...SELMA...SHAVANO PARK...TERRELL HILLS...THE
  DOMINION AND WINDCREST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD
WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS.

&&

LAT...LON 2926 9869 2964 9879 2971 9857 2964 9835
      2946 9820 2926 9835 2917 9845

$$

4 follow-up statements

722 
WGUS74 KEWX 251011
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
411 AM CST WED JAN 25 2012

TXC029-251100-
/O.CON.KEWX.FF.W.0001.000000T0000Z-120125T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
411 AM CST WED JAN 25 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 AM CST FOR BEXAR
COUNTY...

AT 407 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A 
SECOND LIND OF THUNDERSTORMS PRODUCING FLASH FLOODING OVER THE 
WARNED AREA. THIS LINE WILL MOVE THROUGH BEXAR COUNTY WITHIN THE 
NEXT HOUR BRINGING AN ADDITIONAL INCH OF RAIN TO THE AREA.

LOCATIONS IN THE WARNING AREA INCLUDE WINDCREST...UNIVERSAL CITY...
THE DOMINION...TERRELL HILLS...SHAVANO PARK...SEA WORLD...SAN
ANTONIO...OLMOS PARK...LIVE OAK...LEON VALLEY...LEON SPRINGS...
KIRBY...HOLLYWOOD PARK...HILL COUNTRY VILLA...HELOTES...CROSS
MOUNTAIN...ALAMO HEIGHTS AND SELMA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD
WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 AM CST WEDNESDAY MORNING
FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2926 9869 2964 9879 2971 9857 2964 9835
      2946 9820 2926 9835 2917 9845

$$

834 
WGUS54 KEWX 251042
FFWEWX
TXC029-251400-
/O.EXT.KEWX.FF.W.0001.000000T0000Z-120125T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
442 AM CST WED JAN 25 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  BEXAR COUNTY...

* UNTIL 800 AM CST.

* AT 433 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETERMINED THAT AN ADDITIONAL LINE OF THUNDERSTORMS MOVING
  INTO BEXAR COUNTY EARLY THIS MORNING WILL CAUSE ADDITIONAL 
  HEAVY RAINFALL ACROSS BEXAR COUNTY AND THE SAN ANTONIO METRO
  AREA. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  CONTINUE...WITH FLASH FLOODING POSSIBLE AT SOME NEW LOCATIONS. 
  SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SAN
  ANTONIO...UNIVERSAL CITY...ALAMO HEIGHTS...CHINA GROVE...CROSS
  MOUNTAIN...HELOTES...HILL COUNTRY VILLA...HOLLYWOOD PARK...KIRBY...
  LACKLAND AFB...LEON SPRINGS...LEON VALLEY...LIVE OAK...OLMOS
  PARK...SEA WORLD...SELMA...SHAVANO PARK...TERRELL HILLS...THE
  DOMINION AND WINDCREST.

SINCE MIDNIGHT...PORTIONS OF BEXAR COUNTY HAVE RECEIVED 3 TO 4 
INCHES OF RAINFALL. THE SAN ANTONIO INTERNATIONAL AIRPORT HAS 
MEASURED 2.53 INCHES OF RAIN SINCE MIDNIGHT. STINSON MUNICIPAL 
AIRPORT HAS MEASURED 3.25 INCHES OF RAINFALL SINCE MIDNIGHT. 

AN ADDITIONAL ONE TO TWO INCHES IS POSSIBLE THROUGH THE EARLY 
MORNING HOURS. THE ADDITIONAL RAINFALL WILL COMBINE WITH RUNOFF FROM 
PREVIOUS STORMS TO MAKE FOR A VERY DANGEROUS MORNING COMMUTE. 
DRIVERS SHOULD ANTICIPATE WET ROADS...LOW VISIBILITIES...AS WELL AS 
ROAD CLOSURES THIS MORNING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD
WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS. DO NOT 
DRIVE AROUND BARRICADES. THEY ARE THERE FOR YOUR PROTECTION.

&&

LAT...LON 2926 9869 2964 9879 2971 9857 2964 9835
      2946 9820 2926 9835 2917 9845

$$

695 
WGUS74 KEWX 251239
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
639 AM CST WED JAN 25 2012

TXC029-251400-
/O.CON.KEWX.FF.W.0001.000000T0000Z-120125T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
639 AM CST WED JAN 25 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 AM CST FOR BEXAR
COUNTY...

AT 636 AM CST...NATIONAL WEATHER SERVICE RADAR METEOROLOGISTS 
INDICATE THE RAINS HAVE ENDED ACROSS BEXAR COUNTY. HOWEVER... SMALL 
STREAMS WILL CONTINUE TO BE OUT OF BANKS FOR THE NEXT HOUR FROM 
EARLIER HEAVY RAINS.

LOCATIONS IN THE WARNING AREA INCLUDE WINDCREST...UNIVERSAL CITY...
THE DOMINION...TERRELL HILLS...SHAVANO PARK...SEA WORLD...SAN
ANTONIO...OLMOS PARK...LIVE OAK...LEON VALLEY...LEON SPRINGS...
KIRBY...HOLLYWOOD PARK...HILL COUNTRY VILLA...HELOTES...CROSS
MOUNTAIN...ALAMO HEIGHTS AND SELMA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RUNOFF FROM HEAVY RAIN WILL FLOOD CREEKS, STREAMS, STREET
INTERSECTIONS, CULVERTS AND UNDERPASSES. LOW LYING PLACES THAT
NORMALLY FLOOD COULD BECOME DEATH TRAPS. DO NOT CROSS ANY FLOODED
AREA. TURN AROUND DON'T DROWN.

&&

LAT...LON 2926 9869 2964 9879 2971 9857 2964 9835
      2946 9820 2926 9835 2917 9845

$$

497 
WGUS74 KEWX 251351
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
751 AM CST WED JAN 25 2012

TXC029-251400-
/O.CON.KEWX.FF.W.0001.000000T0000Z-120125T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
751 AM CST WED JAN 25 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 AM CST FOR BEXAR
COUNTY...

AT 750 AM CST...SHOWERS AND THUNDERSTORMS HAVE MOVED AWAY FROM BEXAR 
COUNTY AND NO SIGNIFICANT RAINFALL AMOUNTS ARE EXPECTED FOR THE REST 
OF TODAY. HOWEVER...MINOR FLOODING ACROSS URBAN AND SMALL STREAM 
AREAS STILL OCCURRING IN SOME PLACES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RUNOFF FROM HEAVY RAIN WILL FLOOD CREEKS, STREAMS, STREET
INTERSECTIONS, CULVERTS AND UNDERPASSES. LOW LYING PLACES THAT
NORMALLY FLOOD COULD BECOME DEATH TRAPS. DO NOT CROSS ANY FLOODED
AREA. TURN AROUND DON'T DROWN.

&&

LAT...LON 2926 9869 2964 9879 2971 9857 2964 9835
      2946 9820 2926 9835 2917 9845

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 24, 10:38 PM CST	Severe Thunderstorm Warning	EWX	Val Verde	26 min
Jan 24, 10:40 PM CST	Severe Thunderstorm Warning	EWX	Val Verde	35 min
Jan 24, 10:52 PM CST	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	38 min
Jan 24, 11:17 PM CST	Severe Thunderstorm Warning	EWX	Edwards	28 min
Jan 24, 11:29 PM CST	Tornado Warning	EWX	Edwards	16 min
Jan 24, 11:41 PM CST	Severe Thunderstorm Warning	EWX	Edwards	35 min
Jan 24, 11:44 PM CST	Severe Thunderstorm Warning	EWX	Edwards	32 min
Jan 25, 12:20 AM CST	Severe Thunderstorm Warning	EWX	Edwards, Real	40 min
Jan 25, 1:17 AM CST	Areal Flood Advisory	EWX	Bexar	103 min
Jan 25, 1:33 AM CST	Severe Thunderstorm Warning	EWX	Bexar, Comal, Guadalupe, Hays	42 min
Jan 25, 2:06 AM CST	Areal Flood Advisory	EWX	Caldwell, Comal, Guadalupe, Hays	114 min
Jan 25, 2:15 AM CST	Areal Flood Advisory	EWX	Hays, Travis	105 min
Jan 25, 2:47 AM CST	Flash Flood Warning	EWX	Travis	3 hr
Jan 25, 3:33 AM CST	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Hays, Travis	42 min
Jan 25, 4:06 AM CST	Areal Flood Advisory	EWX	Bexar, Blanco, Comal, Hays, Kendall	114 min
Jan 25, 4:09 AM CST	Areal Flood Advisory	EWX	Bastrop, Caldwell	111 min
Jan 25, 4:26 AM CST	Flash Flood Warning	EWX	Bastrop	3 hr
Jan 25, 4:26 AM CST	Flash Flood Warning	EWX	Travis, Williamson	3 hr
Jan 25, 4:54 AM CST	Areal Flood Advisory	EWX	Comal, Guadalupe, Hays	2 hr
Jan 25, 5:18 AM CST	Flash Flood Warning	EWX	Bastrop, Caldwell, Hays, Travis	3 hr
Jan 25, 5:49 AM CST	Areal Flood Advisory	EWX	Guadalupe	101 min
Jan 25, 5:54 AM CST	Areal Flood Advisory	EWX	Bastrop, Caldwell	2 hr
Jan 25, 6:07 AM CST	Flash Flood Warning	EWX	Lee	3 hr
Jan 25, 6:23 AM CST	Severe Thunderstorm Warning	EWX	Lee	52 min
Jan 25, 6:26 AM CST	River Flood Warning	EWX	Travis	14 hr
Jan 25, 6:39 AM CST	River Flood Warning	EWX	Bexar	14 hr
Jan 25, 6:46 AM CST	Flash Flood Warning	EWX	Bastrop	3 hr
Jan 25, 6:56 AM CST	River Flood Warning	EWX	Bexar, Wilson	32 hr
Jan 25, 7:04 AM CST	Flash Flood Warning	EWX	Fayette	3 hr
Jan 25, 9:05 AM CST	River Flood Warning	EWX	Caldwell, Gonzales	34 hr
Jan 25, 9:05 AM CST	River Flood Warning	EWX	Gonzales	60 hr
Jan 25, 9:27 AM CST	Flash Flood Warning	EWX	Bastrop	2 hr
Jan 25, 5:49 PM CST	Areal Flood Advisory	EWX	Bastrop	101 min

Nearby

Flash Flood Warnings in Texas, 2012 Every flash flood warning in 2012

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.