Alert archive / Texas / Flash Flood Warnings in 2012
Flash Flood Warning 37, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at May 10, 2012, 9:10 PM CDT for 4 counties in Texas. It was in force for 3 hr. 2 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
- May 10, 2012, 9:10 PM CDT (02:10 UTC)
- Expired
- May 11, 2012, 12:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bexar County, TX, Comal County, TX, Guadalupe County, TX, Hays County, TX
The radar
The Austin/San Antonio radar (KEWX), 45 km from the middle of the area, began a volume at 02:12 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 |
|---|---|---|---|
| May 10, 9:48 PM CDT | FLASH FLOOD | 5 Sw San Antonio, TX | THERE ARE CURRENTLY 7 ROADS IN AND AROUND SAN ANTONIO CLOSED DUE TO FLOODING. |
| May 10, 11:32 PM CDT | FLASH FLOOD | N San Antonio, TX | THERE ARE CURRENTLY 17 ROADS 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
Del Rio, TX (KDRT), launched 00:00Z, 2.2 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.
- Mixed-layer CAPE
- 67 J/kg
- Mixed-layer CIN
- -176 J/kg
- Mixed-layer LCL
- 934 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
046
WGUS54 KEWX 110210
FFWEWX
TXC029-091-187-209-110500-
/O.NEW.KEWX.FF.W.0037.120511T0210Z-120511T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
910 PM CDT THU MAY 10 2012
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BEXAR COUNTY...
COMAL COUNTY...
WEST CENTRAL GUADALUPE COUNTY...
SOUTHERN HAYS COUNTY...
* UNTIL MIDNIGHT CDT.
* AT 907 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE
FLASH FLOODING ACROSS THE SAN ANTONIO METROPOLITAN AREA TO NEW
BRAUNFELS...AND SAN MARCOS. RAINFALL RATES OF 1 TO 2 INCHES
PER HOUR WILL OCCUR WITH THESE STORMS.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...CANYON LAKE
DAM...NEW BRAUNFELS...SAN ANTONIO...UNIVERSAL CITY...ALAMO
HEIGHTS...BULVERDE...CALAVERAS LAKE...CHINA GROVE...CIBOLO...CROSS
MOUNTAIN...ELMENDORF...FAIR OAKS RANCH...FISCHER...GARDEN RIDGE...
HELOTES...HILL COUNTRY VILLA...HOLLYWOOD PARK...KIRBY...LACKLAND
AFB...LEON SPRINGS...LEON VALLEY...LIVE OAK...MARION...OLMOS
PARK...SCHERTZ...SEA WORLD...SELMA...SHAVANO PARK...SOMERSET AND
SPRING BRANCH.
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 2925 9880 2970 9880 2972 9878 2972 9874
2975 9866 2975 9859 3006 9826 2983 9796
2949 9814 2948 9812 2945 9812 2911 9841
$$2 follow-up statements
798
WGUS74 KEWX 110232
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
932 PM CDT THU MAY 10 2012
TXC029-091-187-209-110500-
/O.CON.KEWX.FF.W.0037.000000T0000Z-120511T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GUADALUPE TX-HAYS TX-BEXAR TX-COMAL TX-
932 PM CDT THU MAY 10 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
COMAL...BEXAR...SOUTHERN HAYS AND WEST CENTRAL GUADALUPE COUNTIES...
AT 925 PM CDT...A COMPLEX OF SHOWERS AND THUNDERSTORMS WAS OVER MUCH
OF BEXAR AND COMAL COUNTIES MOVING EAST AT 30 MPH. RAINFALL RATES
CONTINUE IN THE ONE TO TWO INCH PER HOUR RANGE.
SOME SECONDARY ROADS AND LOW WATER CROSSINGS MAY FLOOD ACROSS COMAL
AND OVER SOUTHERN AND EASTERN BEXAR COUNTIES OVER THE NEXT FEW
HOURS. MOTORISTS SHOULD NOT ENTER LOW WATER CROSSINGS AS 80 PERCENT
OF FLOOD FATALITIES OCCUR THIS WAY.
LOCATIONS IN THE WARNING AREA INCLUDE FISCHER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
RUNOFF FROM HEAVY RAIN WILL FLOOD CREEKS, STREAMS, STREET
INTERSECTIONS, CULVERTS AND UNDERPASSES. LOW LYING PLACES THAT
NORMALLY FLOOD COULD BECOME DEATH TRAPS. DO NOT CROSS ANY FLOODED
AREA. TURN AROUND DON'T DROWN.
WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT FRIDAY MORNING FOR
SOUTH CENTRAL TEXAS.
&&
LAT...LON 2925 9880 2970 9880 2972 9878 2972 9874
2975 9866 2975 9859 3006 9826 2983 9796
2949 9814 2948 9812 2945 9812 2911 9841
$$769
WGUS74 KEWX 110419
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1119 PM CDT THU MAY 10 2012
TXC029-091-187-209-110500-
/O.CON.KEWX.FF.W.0037.000000T0000Z-120511T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GUADALUPE TX-HAYS TX-BEXAR TX-COMAL TX-
1119 PM CDT THU MAY 10 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
COMAL...BEXAR...SOUTHERN HAYS AND WEST CENTRAL GUADALUPE COUNTIES...
AT 1115 PM CDT...ISOLATED LOW WATER CROSSINGS AND LOCAL ROADS ACROSS
THE COMAL...BEXAR...HAYS AND GUADALUPE COUNTIES CONTINUE FLOODED AT
THIS HOUR AS THEY SLOWLY DRAIN. THE SHOWER ACTIVITY HAS ENDED FOR
NOW...HOWEVER...FLOODED AREAS WILL CONTINUE FOR THE NEXT SEVERAL
HOURS...ESPECIALLY EAST OF THE SAN ANTONIO AND AUSTIN METRO AREAS.
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 2925 9880 2970 9880 2972 9878 2972 9874
2975 9866 2975 9859 3006 9826 2983 9796
2949 9814 2948 9812 2945 9812 2911 9841
$$The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 7:21 PM CDT | Tornado Warning | EWX | Dimmit, Frio, Zavala | 24 min |
| May 10, 7:59 PM CDT | River Flood Warning | EWX | Kerr | 18 hr |
| May 10, 8:02 PM CDT | Flash Flood Warning | EWX | Hays, Travis, Williamson | 118 min |
| May 10, 8:26 PM CDT | Severe Thunderstorm Warning | EWX | Travis, Williamson | 49 min |
| May 10, 8:32 PM CDT | River Flood Warning | EWX | Val Verde | 30 hr |
| May 10, 8:34 PM CDT | Areal Flood Advisory | EWX | Bexar | 116 min |
| May 10, 9:59 PM CDT | Areal Flood Advisory | EWX | Bastrop, Caldwell, Comal, Guadalupe, Hays, Lee and 2 more | 2 hr |
| May 10, 10:42 PM CDT | Flash Flood Warning | EWX | Bastrop, Caldwell, Guadalupe, Hays, Lee, Travis and 1 more | 4 hr |
| May 11, 12:06 AM CDT | Flash Flood Warning | EWX | Bexar, Comal | 3 hr |
| May 11, 2:37 AM CDT | Flash Flood Warning | EWX | Hays | 113 min |
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.