Alert archive / Texas / Flash Flood Warnings in 2012
Flash Flood Warning 45, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Jul 11, 2012, 8:16 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
- Jul 11, 2012, 8:16 AM CDT (13:16 UTC)
- Expired
- Jul 11, 2012, 11:00 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), 49 km from the middle of the area, began a volume at 13:18 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 |
|---|---|---|---|
| Jul 11, 8:30 AM CDT | HEAVY RAIN 1.74 | 1 N Castle Hills, TX | 1.52 INCHES IN 50 MINUTES. |
| Jul 11, 8:30 AM CDT | HEAVY RAIN 2.24 | 2 Sse Leon Valley, TX | 2.24 INCHES IN ONE HOUR. WIND GUSTS TO 48 MPH. |
| Jul 11, 8:40 AM CDT | FLASH FLOOD | 2 W Live Oak, TX | SEVERAL ROADS ARE CLOSED IN AND AROUND SAN ANTONIO DUE TO FLOODING. |
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, 1.3 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.
- Mixed-layer CAPE
- 2040 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 702 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
794
WGUS54 KEWX 111316
FFWEWX
TXC029-111600-
/O.NEW.KEWX.FF.W.0045.120711T1316Z-120711T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
816 AM CDT WED JUL 11 2012
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BEXAR COUNTY...
* UNTIL 1100 AM CDT.
* AT 810 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
DETERMINED THAT SLOW MOVING THUNDERSTORMS WITH VERY HEAVY
RAINFALL WILL CAUSE RUNOFF AND FLASH FLOODING ACROSS THE SAN
ANTONIO METRO AREA.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SAN
ANTONIO...ALAMO HEIGHTS...CALAVERAS LAKE...CHINA GROVE...
ELMENDORF...HOLLYWOOD PARK...KIRBY...LACKLAND AFB...LEON VALLEY...
LIVE OAK...OLMOS PARK...SEA WORLD...SHAVANO PARK...ST. HEDWIG...
TERRELL HILLS AND WINDCREST.
THESE THUNDERSTORMS HAVE ALREADY PRODUCED HEAVY RAINFALL OF 2 TO 3
INCHES ACROSS GUADALUPE AND COMAL COUNTIES SINCE 6 AM THIS MORNING.
THE THUNDERSTORMS ARE EXPECTED TO PRODUCE AS MUCH AS 3 TO 4 INCHES
OF RAIN ACROSS THE SAN ANTONIO METRO AREA...INCLUDING THE DOWNTOWN
AREA. RAINFALL FROM THESE STORMS WILL BE QUICK TO RUNOFF AND WILL
CAUSE FLASH FLOODING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
&&
LAT...LON 2970 9858 2945 9814 2933 9823 2918 9841
2936 9876
$$3 follow-up statements
162
WGUS74 KEWX 111345
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
845 AM CDT WED JUL 11 2012
TXC029-111600-
/O.CON.KEWX.FF.W.0045.000000T0000Z-120711T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
845 AM CDT WED JUL 11 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT FOR
BEXAR COUNTY...
AT 845 AM CDT...THUNDERSTORMS PRODUCING VERY HEAVY RAIN CONTINUED
OVER THE WARNED AREA.
THESE THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL. RADAR
ESTIMATES HAVE INDICATED INTENSE RAINFALL RATES AS HIGH AS 6 INCHES
OR MORE PER HOUR. THESE EXTREME RAINFALL RATES WILL RAPIDLY LEAD TO
RUNOFF AND FLASH FLOODING. SUDDEN REDUCTIONS IN VISIBILITIES CAN
ALSO BE EXPECTED WITH THESE INTENSE RAIN CORES.
THE SAN ANTONIO INTERNATIONAL AIRPORT HAS ALREADY MEASURED OVER 2
INCHES OF RAIN WITH THESE STORMS. ADDITIONAL OBSERVER REPORTS HAVE
INDICATED THAT 2 TO 2.5 INCHES OF RAIN HAS FALLEN ACROSS THE SAN
ANTONIO METRO AREA SINCE 8 AM.
ADDITIONAL RAINFALL AMOUNTS OF 2 TO 3 INCHES OR MORE ARE POSSIBLE
WITH THESE STORMS THIS MORNING.
LOCATIONS IN THE WARNING AREA INCLUDE WINDCREST...TERRELL HILLS...ST.
HEDWIG...SHAVANO PARK...SEA WORLD...SAN ANTONIO...OLMOS PARK...LIVE
OAK...LEON VALLEY...KIRBY...HOLLYWOOD PARK AND ALAMO HEIGHTS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
RUNOFF FROM HEAVY RAIN WILL FLOOD CREEKS, STREAMS, STREET
INTERSECTIONS, CULVERTS AND UNDERPASSES. LOW LYING PLACES THAT
NORMALLY FLOOD COULD BECOME DEATH TRAPS. DO NOT CROSS ANY FLOODED
AREA. TURN AROUND DON'T DROWN.
&&
LAT...LON 2970 9858 2945 9814 2933 9823 2918 9841
2936 9876
$$368
WGUS74 KEWX 111455
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
955 AM CDT WED JUL 11 2012
TXC029-111600-
/O.CON.KEWX.FF.W.0045.000000T0000Z-120711T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
955 AM CDT WED JUL 11 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT FOR
BEXAR COUNTY...
AT 9:45 AM CDT...LIGHT TO MODERATE RAIN WAS CONTINUING ACROSS THE
SAN ANTONIO METRO AREA. WIDESPREAD HEAVY RAINFALL IS NOT EXPECTED
ACROSS THE CITY THROUGH THE REST OF THIS MORNING...BUT LIGHT TO
MODERATE RAIN IS EXPECTED TO CONTINUE THROUGH AT LEAST 10:30 AM. AN
ADDITIONAL ONE HALF OF AN INCH TO NEAR ONE INCH OF RAIN IS POSSIBLE
THROUGH THE REMAINDER OF THE MORNING. EVEN THOUGH HEAVY RAIN IS NO
LONGER EXPECTED...RUNOFF FROM THE EARLIER INTENSE RAINFALL WILL
CONTINUE TO CAUSE FLASH FLOODING ACROSS THE SAN ANTONIO METRO AREA
THROUGH THIS MORNING.
AT 9:45 AM...THE SAN ANTONIO INTERNATIONAL AIRPORT REPORTED 2.56
INCHES OF RAIN. RAINFALL OBSERVERS ACROSS THE METRO AREA HAVE ALSO
REPORTED RAINFALL TOTALS OF 2 TO 3 INCHES. AN ADDITIONAL HALF OF AN
INCH TO NEAR ONE INCH OF RAIN IS POSSIBLE THIS MORNING.
LOCATIONS IN THE WARNING AREA INCLUDE WINDCREST...TERRELL HILLS...ST.
HEDWIG...SHAVANO PARK...SEA WORLD...SAN ANTONIO...OLMOS PARK...LIVE
OAK...LEON VALLEY...KIRBY...HOLLYWOOD PARK AND ALAMO HEIGHTS.
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 2970 9858 2945 9814 2933 9823 2918 9841
2936 9876
$$091
WGUS74 KEWX 111552
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1052 AM CDT WED JUL 11 2012
TXC029-111600-
/O.CON.KEWX.FF.W.0045.000000T0000Z-120711T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
1052 AM CDT WED JUL 11 2012
...THE FLASH FLOOD WARNING FOR BEXAR COUNTY WILL BE ALLOWED TO
EXPIRE AT 1100 AM CDT...
AT 1045 AM CDT...ONLY LIGHT RAIN WAS FALLING ACROSS THE SAN ANTONIO
METRO AREA. ADDITIONAL WIDESPREAD HEAVY RAINFALL IS NOT EXPECTED
THROUGH THE EARLY AFTERNOON HOURS. HOWEVER...RUNOFF FROM THE HEAVY
RAINFALL EARLIER THIS MORNING WILL CONTINUE. THERE IS A CONTINUING
CHANCE FOR ADDITIONAL RAINFALL...POSSIBLY HEAVY AT TIMES...THROUGH
THE AFTERNOON AND TONIGHT. ADDITIONAL FLASH FLOOD WARNINGS MAY BE
NECESSARY.
LOCATIONS IN THE WARNING AREA INCLUDE WINDCREST...TERRELL HILLS...ST.
HEDWIG...SHAVANO PARK...SEA WORLD...SAN ANTONIO...OLMOS PARK...LIVE
OAK...LEON VALLEY...KIRBY...HOLLYWOOD PARK AND ALAMO HEIGHTS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
RUNOFF FROM HEAVY RAIN WILL FLOOD CREEKS, STREAMS, STREET
INTERSECTIONS, CULVERTS AND UNDERPASSES. LOW LYING PLACES THAT
NORMALLY FLOOD COULD BECOME DEATH TRAPS. DO NOT CROSS ANY FLOODED
AREA. TURN AROUND DON'T DROWN.
&&
LAT...LON 2970 9858 2945 9814 2933 9823 2918 9841
2936 9876
$$The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 7:02 PM CDT | Areal Flood Advisory | EWX | Edwards, Kinney, Val Verde | 3 hr |
| Jul 10, 7:13 PM CDT | Areal Flood Advisory | EWX | Williamson | 107 min |
| Jul 10, 7:37 PM CDT | Flash Flood Warning | EWX | Edwards, Kinney, Real, Uvalde | 4 hr |
| Jul 10, 8:50 PM CDT | Areal Flood Advisory | EWX | Travis, Williamson | 2 hr |
| Jul 10, 9:29 PM CDT | Flash Flood Warning | EWX | Travis | 3 hr |
| Jul 10, 9:36 PM CDT | Areal Flood Advisory | EWX | Blanco, Hays | 3 hr |
| Jul 11, 2:00 AM CDT | Areal Flood Advisory | EWX | Gonzales, Guadalupe, Wilson | 3 hr |
| Jul 11, 6:05 AM CDT | Areal Flood Advisory | EWX | DeWitt, Gonzales, Wilson | 3 hr |
| Jul 11, 6:59 AM CDT | Areal Flood Advisory | EWX | Bexar, Comal, Guadalupe, Wilson | 2 hr |
| Jul 11, 3:19 PM CDT | Areal Flood Advisory | EWX | Atascosa, Bastrop, Bexar, Caldwell, Comal, Guadalupe and 4 more | 4 hr |
| Jul 11, 4:00 PM CDT | Areal Flood Advisory | EWX | Dimmit, Maverick, Zavala | 3 hr |
| Jul 11, 4:38 PM CDT | Flash Flood Warning | EWX | Bexar, Comal, Guadalupe | 4 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.