Alert archive / Texas / Flash Flood Warnings in 2012
Flash Flood Warning 54, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Aug 18, 2012, 10:45 PM CDT for Travis County, Williamson County, Texas. It was in force for 105 min. 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
- Aug 18, 2012, 10:45 PM CDT (03:45 UTC)
- Expired
- Aug 19, 2012, 12:30 AM CDT
- In force
- 105 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties Travis County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 25 km from the middle of the area, began a volume at 03:47 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 18, 11:10 PM CDT | FLOOD | 1 E Serenada, TX | BERRY CREEK BRIEFLY TOUCHED FLOOD STAGE... RAAINFALL OVER 8 HR TIMESPAN |
| Aug 18, 11:10 PM CDT | HEAVY RAIN 5.05 | 1 E Serenada, TX | BERRY CREEK BRIEFLY TOUCHED FLOOD STAGE... RAAINFALL OVER 8 HR TIMESPAN |
| Aug 18, 11:25 PM CDT | HEAVY RAIN 1.68 | 4 Sw Hutto, TX | 1 HR 35 MIN RAINFALL |
| Aug 18, 11:30 PM CDT | FLASH FLOOD | 1 W Weir, TX | ROAD CLOSURE DUE TO HIGH WATER AT FM971 NEAR BERRY CREEK. |
| Aug 18, 11:59 PM CDT | HEAVY RAIN 4.4 | 5 S Georgetown, TX | 24 HOUR RAINFALL TOTAL. |
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, 3.8 hours before the alert went out and 314 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.
595
WGUS54 KEWX 190345
FFWEWX
TXC453-491-190530-
/O.NEW.KEWX.FF.W.0054.120819T0345Z-120819T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1045 PM CDT SAT AUG 18 2012
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EASTERN TRAVIS COUNTY...
WILLIAMSON COUNTY...
* UNTIL 1230 AM CDT.
* AT 1040 PM CDT...THE PUBLIC REPORTED SLOW MOVING THUNDERSTORMS WITH
VERY HEAVY RAINFALL ACROSS WILLIAMSON AND TRAVIS COUNTIES...
GENERALLY ALONG AND EAST OF INTERSTATE 35. RAINFALL AMOUNTS
OF 1 TO 2 INCHES CAN BE EXPECTED IN A SHORT PERIOD OF TIME.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
AUSTIN...AUSTIN BERGSTROM INT AP...GEORGETOWN...GRANGER...
PFLUGERVILLE...ROUND ROCK...SERENADA...TAYLOR...WINDEMERE...
BARTLETT...COUPLAND...GEORGETOWN DAM...GRANGER DAM...HUTTO...
JARRELL...MANOR...ONION CREEK...SUN CITY...THRALL AND WEIR.
OVER ONE INCH OF RAINFALL WAS REPORTED NEAR GEORGETOWN IN AROUND 10
MINUTES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
&&
LAT...LON 3088 9762 3075 9728 3071 9725 3049 9716
3046 9737 3021 9752 3007 9772 3016 9781
3042 9775 3067 9780 3089 9769
$$1 follow-up statement
562
WGUS74 KEWX 190419
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1119 PM CDT SAT AUG 18 2012
TXC453-491-190530-
/O.CON.KEWX.FF.W.0054.000000T0000Z-120819T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TRAVIS TX-WILLIAMSON TX-
1119 PM CDT SAT AUG 18 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR
WILLIAMSON AND EASTERN TRAVIS COUNTIES...
AT 1112 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT THUNDERSTORMS PRODUCING VERY HEAVY RAIN. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM TAYLOR TO AUSTIN BERGSTROM INT
AP...MOVING SOUTHEAST AT 15 MPH.
OTHER LOCATIONS IN THE WARNING AREA INCLUDE GRANGER DAM...COUPLAND
AND THRALL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
&&
LAT...LON 3088 9762 3075 9728 3071 9725 3049 9716
3046 9737 3021 9752 3007 9772 3016 9781
3042 9775 3067 9780 3089 9769
$$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, 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, 2:00 AM CDT | Flash Flood Warning | EWX | Bexar | 3 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.