Alert archive / Texas / Flash Flood Warnings in 2012
Flash Flood Warning 56, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Aug 19, 2012, 2:00 AM CDT for Bexar County, Texas. It was in force for 3 hr. 3 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
- Aug 19, 2012, 2:00 AM CDT (07:00 UTC)
- Expired
- Aug 19, 2012, 5:00 AM CDT
- In force
- 3 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), 54 km from the middle of the area, began a volume at 07:02 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 |
|---|---|---|---|
| Aug 19, 2:17 AM CDT | FLASH FLOOD | 2 Sse Lackland Afb, TX | ROAD CLOSURE. BROOKVALLEY AT RAY ELLISON BLVD |
| Aug 19, 2:18 AM CDT | HEAVY RAIN 1.4 | 2 Sse Leon Valley, TX | 30 MIN RAINFALL |
| Aug 19, 2:52 AM CDT | FLASH FLOOD | 4 N Lackland Afb, TX | ROAD CLOSURE. PINN RD FROM W. COMMERCE TO HWY151 |
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, 7.0 hours before the alert went out and 222 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.
- Mixed-layer CAPE
- 1435 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 1442 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.7
The text
As transmitted, in the capitals the NWS used until 2016.
139
WGUS54 KEWX 190700
FFWEWX
TXC029-191000-
/O.NEW.KEWX.FF.W.0056.120819T0700Z-120819T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
200 AM CDT SUN AUG 19 2012
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BEXAR COUNTY...
* UNTIL 500 AM CDT.
* AT 157 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE SLOW
MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WESTERN
PART OF BEXAR COUNTY TO PUSH EASTWARD WITHIN THE NEXT FEW HOURS.
THESE STORMS ARE PRODUCING HEAVY RAINS WITH POSSIBLE ONE TO TWO
INCHES OF RAINFALL ACCUMULATIONS WITHIN AN HOUR. THE SAN ANTONIO
AREA WILL BEGIN TO FELL THE EFFECT OF THESE STORMS WITHIN THE NEXT
5 TO 15 MINUTES.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SAN
ANTONIO...ALAMO HEIGHTS...CHINA GROVE...CROSS MOUNTAIN...
ELMENDORF...HELOTES...HOLLYWOOD PARK...KIRBY...LACKLAND AFB...LEON
SPRINGS...LEON VALLEY...LIVE OAK...OLMOS PARK...SEA WORLD...SHAVANO
PARK...ST. HEDWIG...TERRELL HILLS...THE DOMINION AND WINDCREST.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
&&
LAT...LON 2929 9877 2970 9877 2970 9839 2954 9830
2946 9815 2916 9840
$$3 follow-up statements
806
WGUS74 KEWX 190709
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
209 AM CDT SUN AUG 19 2012
TXC029-191000-
/O.CON.KEWX.FF.W.0056.000000T0000Z-120819T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
209 AM CDT SUN AUG 19 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 AM CDT FOR BEXAR
COUNTY...
AT 206 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WESTERN PART OF BEXAR COUNTY...PUSHING EASTWARD AT ABOUT 10 MPH.
THESE STORMS ARE PRODUCING HEAVY RAINS WITH POSSIBLE ONE TO TWO
INCHES OF RAINFALL ACCUMULATIONS WITHIN AN HOUR. THE SAN ANTONIO
AREA WILL BEGIN TO FEEL THE EFFECT OF THESE STORMS WITHIN THE NEXT
5 MINUTES.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SAN
ANTONIO...ALAMO HEIGHTS...CHINA GROVE...CROSS MOUNTAIN...
ELMENDORF...HELOTES...HOLLYWOOD PARK...KIRBY...LACKLAND AFB...LEON
SPRINGS...LEON VALLEY...LIVE OAK...OLMOS PARK...SEA
WORLD...SHAVANO PARK...ST. HEDWIG...TERRELL HILLS...THE DOMINION
AND WINDCREST.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
&&
LAT...LON 2929 9877 2970 9877 2970 9840 2954 9830
2946 9815 2916 9840
$$786
WGUS74 KEWX 190742
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
242 AM CDT SUN AUG 19 2012
TXC029-191000-
/O.CON.KEWX.FF.W.0056.000000T0000Z-120819T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
242 AM CDT SUN AUG 19 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 AM CDT FOR BEXAR
COUNTY...
AT 235 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LINE OF STORMS MOVING EAST SOUTHEAST AT 10 MPH AND
AFFECTING MOST AREAS ALONG HIGHWAY 281 FROM HOLLYWOOD PARK SOUTHWARD
TO THELMA. THE STRONGEST STORMS AT THIS HOUR ARE OCCURRING JUST
SOUTH OF THELMA AND MOVING INTO NORTHERN ATASCOSA COUNTY. EXPECT
HEAVY RAINS AND THUNDERSTORM ACTIVITY ACROSS THE SAN ANTONIO AREA
FOR THE NEXT FEW HOURS WITH POSSIBLE ONE TO TWO INCHES OF RAINFALL
ACCUMULATIONS BEFORE THE STORMS MOVE AWAY OR DISSIPATE.
LOCATIONS IN THE WARNING AREA INCLUDE TERRELL HILLS...WINDCREST...THE
DOMINION...SHAVANO PARK...LIVE OAK...LEON VALLEY...LEON SPRINGS...
HOLLYWOOD PARK...HELOTES...CROSS MOUNTAIN AND ALAMO HEIGHTS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
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 2929 9877 2970 9877 2970 9840 2954 9830
2946 9815 2916 9840
$$116
WGUS74 KEWX 190845
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
345 AM CDT SUN AUG 19 2012
TXC029-191000-
/O.CON.KEWX.FF.W.0056.000000T0000Z-120819T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
345 AM CDT SUN AUG 19 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 AM CDT FOR BEXAR
COUNTY...
AT 338 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LINE OF STORMS WITH VERY HEAVY RAINS AND THUNDERSTORMS
AFFECTING THE SAN ANTONIO METRO AREA. SEVERAL ROADS HAVE BEEN CLOSED
DUE TO THE HEAVY RAINS WITHIN THE PAST HOUR. EXPECT THESE STORMS TO
SLOWLY MOVE EAST SOUTHEAST AT ABOUT 10 MPH WITH AN ADDITIONAL ONE TO
TWO INCHES OF RAINFALL ACCUMULATIONS OVER PARTS OF SAN ANTONIO AND
AREAS ALONG HIGHWAY 281 FROM THE CITY OF SAN ANTONIO SOUTH TO THE
CITY OF THELMA.
LOCATIONS IN THE WARNING AREA INCLUDE WINDCREST...THE DOMINION...
TERRELL HILLS...SHAVANO PARK...LIVE OAK...LEON VALLEY...LEON
SPRINGS...HOLLYWOOD PARK...HELOTES...CROSS MOUNTAIN AND ALAMO
HEIGHTS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD
WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS.
&&
LAT...LON 2929 9877 2970 9877 2970 9840 2954 9830
2946 9815 2916 9840
$$The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 9:18 PM CDT | Areal Flood Advisory | EWX | Guadalupe | 2 hr |
| Aug 18, 10:01 PM CDT | Areal Flood Advisory | EWX | Williamson | 119 min |
| Aug 18, 10:14 PM CDT | Areal Flood Advisory | EWX | Bexar | 106 min |
| Aug 18, 10:28 PM CDT | Areal Flood Advisory | EWX | Travis | 2 hr |
| Aug 18, 10:45 PM CDT | Flash Flood Warning | EWX | Travis, Williamson | 105 min |
| Aug 18, 11:32 PM CDT | Flash Flood Warning | EWX | Bexar | 118 min |
| Aug 18, 11:40 PM CDT | Areal Flood Advisory | EWX | Bastrop, Lee | 110 min |
| Aug 18, 11:50 PM CDT | Areal Flood Advisory | EWX | Caldwell, Gonzales, Guadalupe | 2 hr |
| Aug 19, 12:26 AM CDT | Areal Flood Advisory | EWX | Gillespie | 2 hr |
| Aug 19, 12:50 AM CDT | Areal Flood Advisory | EWX | Bandera, Frio, Medina, Uvalde, Zavala | 100 min |
| Aug 19, 1:16 AM CDT | Areal Flood Advisory | EWX | Fayette | 104 min |
| Aug 19, 1:30 AM CDT | Areal Flood Advisory | EWX | Bexar, Kendall | 2 hr |
| Aug 19, 2:56 AM CDT | Flash Flood Warning | EWX | Medina | 3 hr |
| Aug 19, 4:00 AM CDT | Areal Flood Advisory | EWX | Atascosa | 2 hr |
| Aug 19, 4:54 AM CDT | Areal Flood Advisory | EWX | Wilson | 2 hr |
| Aug 19, 5:12 AM CDT | Flash Flood Warning | EWX | Bexar | 3 hr |
| Aug 19, 5:40 AM CDT | Areal Flood Advisory | EWX | Zavala | 110 min |
| Aug 19, 8:33 AM CDT | Areal Flood Advisory | EWX | Bexar | 117 min |
| Aug 19, 10:25 AM CDT | River Flood Warning | EWX | Bexar | 69 min |
| Aug 19, 11:05 AM CDT | River Flood Warning | EWX | Bexar, Wilson | 22 hr |
Nearby
Flash Flood Warnings in Texas, 2012Every 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.