Alert archive / Texas / Flash Flood Warnings in 2012
Flash Flood Warning 49, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Jul 15, 2012, 5:18 PM CDT for Williamson County, Texas. It was in force for 2 hr. 5 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 15, 2012, 5:18 PM CDT (22:18 UTC)
- Expired
- Jul 15, 2012, 7:30 PM CDT
- In force
- 2 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Flood severity
- None
County Williamson County, TX
The radar
The Ft Hood radar (KGRK), 27 km from the middle of the area, began a volume at 22:20 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 15, 5:59 PM CDT | FLASH FLOOD | Brushy Creek, TX | FLASH FLOODING ON BRUSHY CREEK AT COUNTY ROAD 174 AND RED OAK |
| Jul 15, 6:00 PM CDT | HEAVY RAIN 2.75 | 6 E Leander, TX | RAINFALL OVER THE PAST 2 HOURS |
| Jul 15, 6:09 PM CDT | HEAVY RAIN 3 | 1 S Round Rock, TX | RAINFALL SINCE 345 PM |
| Jul 15, 6:30 PM CDT | HEAVY RAIN 3.49 | 1 Ene Anderson Mill, TX | RAINFALL TOTAL SINCE 450 PM |
| Jul 15, 7:04 PM CDT | FLASH FLOOD | Round Rock, TX | EMERGENCY MANAGER REPORTED SEVERE FLOODING IN SW WILLIAMSON COUNTY ALONG WITH EVACUATIONS IN ROUND ROCK NEAR BRUSHY CREEK |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 10.3 hours before the alert went out and 249 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
- 1985 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 823 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
215
WGUS54 KEWX 152218
FFWEWX
TXC491-160030-
/O.NEW.KEWX.FF.W.0049.120715T2218Z-120716T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
518 PM CDT SUN JUL 15 2012
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL WILLIAMSON COUNTY...
* UNTIL 730 PM CDT.
* AT 515 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A LINE OF SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL
EXTENDING FROM ROUND ROCK TO JARRELL. RAINFALL RATES WERE
ESTIMATED AT 2 TO 4 INCHES AN HOUR. THIS NORTH/SOUTH LINE OF
THUNDERSTORMS WILL IMPACT I-35.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ANDERSON MILL...GEORGETOWN...ROUND ROCK...SERENADA...GEORGETOWN
DAM...HUTTO...JARRELL...SUN CITY AND WEIR.
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 3084 9751 3082 9747 3048 9755 3050 9759
3049 9761 3048 9768 3046 9770 3043 9778
3046 9783 3090 9775
$$2 follow-up statements
420
WGUS74 KEWX 152243
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
543 PM CDT SUN JUL 15 2012
TXC491-160030-
/O.CON.KEWX.FF.W.0049.000000T0000Z-120716T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WILLIAMSON TX-
543 PM CDT SUN JUL 15 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
CENTRAL WILLIAMSON COUNTY...
AT 535 PM CDT...THUNDERSTORMS PRODUCING VERY HEAVY RAIN CONTINUE
OVER THE WARNED AREA. MOVEMENT WAS EAST AT 5 TO 10 MPH. DOPPLER
RADAR ESTIMATED RAINFALL RATES OF 2 TO 4 INCHES AN HOUR. UNDERPASSES
ASSOCIATED WITH I-35 HAVE THE GREATEST RISK OF FLASH FLOODING.
LOCATIONS IN THE WARNING AREA INCLUDE SUN CITY...WEIR...SERENADA...
JARRELL...GEORGETOWN DAM AND GEORGETOWN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
RUNOFF FROM HEAVY RAIN WILL FLOOD CREEKS, STREAMS, STREET
INTERSECTIONS, CULVERTS AND UNDERPASSES. LOW LYING PLACES THAT
NORMALLY FLOOD COULD BECOME DEATH TRAPS. DO NOT CROSS ANY FLOODED
AREA. TURN AROUND DON'T DROWN.
&&
LAT...LON 3084 9751 3082 9747 3048 9755 3050 9759
3049 9761 3048 9768 3046 9770 3043 9778
3046 9783 3090 9775
$$966
WGUS74 KEWX 152312
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
612 PM CDT SUN JUL 15 2012
TXC491-160030-
/O.CON.KEWX.FF.W.0049.000000T0000Z-120716T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WILLIAMSON TX-
612 PM CDT SUN JUL 15 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
CENTRAL WILLIAMSON COUNTY...
AT 605 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT THUNDERSTORM PRODUCING VERY HEAVY RAIN OVER THE WARNED AREA.
THE THUNDERSTORMS WERE MOVING TO THE EAST AND NORTHEAST AT 5 TO 10
MPH. DOPPLER RAINFALL RATES WERE ESTIMATED 2 TO 4 INCHES AN HOUR
BETWEEN BRUSHY CREEK AND ROUND ROCK.
LOCATIONS IN THE WARNING AREA INCLUDE SUN CITY...WEIR...SERENADA...
JARRELL...GEORGETOWN DAM AND GEORGETOWN.
LAW ENFORCEMENT HAS REPORTED FLASH FLOODING ON BRUSHY CREEK AT
COUNTY ROAD 174 AND RED OAK.
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 3084 9751 3082 9747 3048 9755 3050 9759
3049 9761 3048 9768 3046 9770 3043 9778
3046 9783 3090 9775
$$The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 12:25 AM CDT | Areal Flood Advisory | EWX | Travis, Williamson | 2 hr |
| Jul 15, 12:40 AM CDT | Flash Flood Warning | EWX | Travis, Williamson | 3 hr |
| Jul 15, 4:59 PM CDT | Areal Flood Advisory | EWX | Williamson | 2 hr |
| Jul 15, 6:03 PM CDT | Areal Flood Advisory | EWX | Travis | 117 min |
| Jul 15, 6:31 PM CDT | Flash Flood Warning | EWX | Travis | 3 hr |
| Jul 15, 6:40 PM CDT | Areal Flood Advisory | EWX | Bandera, Medina | 110 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.