Alert archive / Texas / Flash Flood Warnings in 2012
Flash Flood Warning 15, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Feb 17, 2012, 10:52 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 17, 2012, 10:52 PM CST (04:52 UTC)
- Expired
- Feb 18, 2012, 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), 47 km from the middle of the area, began a volume at 04:55 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 18, 1:48 AM CST | FLASH FLOOD | 2 N Terrell Hills, TX | CAVE LANE AND KENILWORTH CLOSED 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, 4.9 hours before the alert went out and 233 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 538 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
382
WGUS54 KEWX 180452
FFWEWX
TXC029-180900-
/O.NEW.KEWX.FF.W.0015.120218T0452Z-120218T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1052 PM CST FRI FEB 17 2012
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BEXAR COUNTY...
* UNTIL 300 AM CST.
* AT 1049 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE SLOW
MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED
AREA. THREE QUARTERS TO ONE INCH OF RAIN HAS FALLEN ACROSS THE SAN
ANTONIO METRO AREA AND HEAVY SHOWERS ARE DEVELOPING OVER THE CITY
WHICH WILL BRING ONE TO TWO INCHES OF ADDITIONAL RAIN.
* 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...HILL COUNTRY VILLA...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...
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 2945 9819 2916 9841 2928 9876 2968 9876
2970 9843 2958 9834
$$2 follow-up statements
632
WGUS74 KEWX 180806
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
206 AM CST SAT FEB 18 2012
TXC029-180900-
/O.CON.KEWX.FF.W.0015.000000T0000Z-120218T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
206 AM CST SAT FEB 18 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 AM CST FOR BEXAR
COUNTY...
AT 200 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT MOST OF THE STORMS PRODUCING VERY HEAVY RAINFALL HAVE MOVED OUT
OF THE SAN ANTONIO METRO AREA. EVEN THOUGH THE HEAVIEST RAINFALL HAS
MOVED OUT OF THE SAN ANTONIO METRO AREA...ADDITIONAL LIGHT TO
MODERATE SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED TO CONTINUE
THROUGH THE EARLY MORNING HOURS. RADAR ESTIMATES THAT ONE TO ONE AND
A HALF INCHES OF RAIN HAS FALLEN OVER PORTIONS OF SAN ANTONIO SINCE
MIDNIGHT. ADDITIONAL RAINFALL OF ONE HALF OF AN INCH OR MORE WILL BE
POSSIBLE THROUGH THE EARLY MORNING HOURS AND WILL LIKELY BE QUICK TO
RUNOFF AND MAY CAUSE ADDITIONAL FLOODING.
LOCATIONS IN THE WARNING AREA INCLUDE WINDCREST...THE DOMINION...
TERRELL HILLS...SHAVANO PARK...LIVE OAK...LEON VALLEY...LEON
SPRINGS...HOLLYWOOD PARK...HILL COUNTRY VILLA...HELOTES...CROSS
MOUNTAIN AND ALAMO HEIGHTS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
RUNOFF FROM HEAVY RAIN WILL FLOOD CREEKS, STREAMS, STREET
INTERSECTIONS, CULVERTS AND UNDERPASSES. LOW LYING PLACES THAT
NORMALLY FLOOD COULD BECOME DEATH TRAPS. DO NOT CROSS ANY FLOODED
AREA. TURN AROUND DON'T DROWN.
IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD
WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS.
&&
LAT...LON 2945 9819 2916 9841 2928 9876 2968 9876
2970 9843 2958 9834
$$790
WGUS74 KEWX 180853
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
253 AM CST SAT FEB 18 2012
TXC029-180901-
/O.EXP.KEWX.FF.W.0015.000000T0000Z-120218T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
253 AM CST SAT FEB 18 2012
...THE FLASH FLOOD WARNING FOR BEXAR COUNTY WILL BE ALLOWED TO
EXPIRE AT 300 AM CST...
THE HEAVIEST RAINFALL HAS MOVED EAST OF BEXAR COUNTY AND THE SAN
ANTONIO METRO AREA. SCATTERED SHOWERS ARE STILL POSSIBLE THROUGH THE
EARLY MORNING HOURS...BUT ARE EXPECTED TO PRODUCE ONLY LIGHT RAIN.
LAT...LON 2945 9819 2916 9841 2928 9876 2968 9876
2970 9843 2958 9834
$$The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 17, 10:42 PM CST | Areal Flood Advisory | EWX | Maverick | 108 min |
| Feb 17, 11:05 PM CST | Flash Flood Warning | EWX | Burnet, Llano | 3 hr |
| Feb 18, 12:41 AM CST | Areal Flood Advisory | EWX | Bandera, Blanco, Gillespie, Kendall, Kerr | 109 min |
| Feb 18, 1:04 AM CST | Flash Flood Warning | EWX | Travis, Williamson | 4 hr |
| Feb 18, 7:28 AM CST | Areal Flood Advisory | EWX | Bexar | 2 hr |
| Feb 18, 8:34 AM CST | Areal Flood Advisory | EWX | Bastrop, Caldwell, Comal, Hays, Travis | 116 min |
| Feb 18, 9:03 AM CST | Areal Flood Advisory | EWX | Fayette | 117 min |
| Feb 18, 10:02 AM CST | Areal Flood Advisory | EWX | Williamson | 118 min |
| Feb 18, 11:20 AM CST | Areal Flood Advisory | EWX | Bastrop | 2 hr |
| Feb 18, 3:54 PM CST | Areal Flood Advisory | EWX | Bastrop | 2 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.