Alert archive / Texas / Flash Flood Warnings in 2012
Flash Flood Warning 48, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Jul 15, 2012, 12:40 AM CDT for Travis County, Williamson County, 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
- Jul 15, 2012, 12:40 AM CDT (05:40 UTC)
- Expired
- Jul 15, 2012, 3:30 AM CDT
- In force
- 3 hr
- 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), 64 km from the middle of the area, began a volume at 05:42 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, 1:45 AM CDT | FLASH FLOOD | 5 Ssw Jollyville, TX | SPICEWOOD SPRINGS ROAD CLOSED BETWEEN OLD LAMPASAS AND LOOP 360 DUE TO FLOODING. |
| Jul 15, 1:52 AM CDT | FLASH FLOOD | 5 Ssw Jollyville, TX | OLD SPICEWOOD SPRINGS RD 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
Corpus Christi, TX (KCRP), launched 00:00Z, 5.7 hours before the alert went out and 287 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
- 1864 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 1009 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
563 WGUS54 KEWX 150540 FFWEWX TXC453-491-150830- /O.NEW.KEWX.FF.W.0048.120715T0540Z-120715T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 1240 AM CDT SUN JUL 15 2012 THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL TRAVIS COUNTY... SOUTHWESTERN WILLIAMSON COUNTY... * UNTIL 330 AM CDT. * AT 1238 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATES TWO TO THREE INCHES OF RAIN HAS FALLEN OVER THE WEST SIDE OF THE AUSTIN METRO AREA. ANOTHER ONE TO TWO INCHES OF RAIN IS POSSIBLE WITHING THE NEXT TWO HOURS. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... ANDERSON MILL...AUSTIN...CEDAR PARK...TANGLEWOOD FOREST...BEE CAVE...LAKEWAY...MANSFIELD DAM...ONION CREEK...ROLLINGWOOD AND WEST LAKE HILLS. 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 3010 9776 3029 9804 3054 9787 3037 9759 $$
1 follow-up statement
340 WGUS74 KEWX 150714 FFSEWX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 214 AM CDT SUN JUL 15 2012 TXC453-491-150830- /O.CON.KEWX.FF.W.0048.000000T0000Z-120715T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ TRAVIS TX-WILLIAMSON TX- 214 AM CDT SUN JUL 15 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM CDT FOR SOUTHWESTERN WILLIAMSON AND CENTRAL TRAVIS COUNTIES... AT 207 AM CDT...LOCAL EMERGENCY MANAGEMENT OFFICIALS REPORTED FLASH FLOODING IN NORTHWESTERN AUSTIN. STORMS OVER THE AREA HAVE DISSIPATED. HOWEVER...RUNOFF FROM EARLY RAIN WILL CONTINUE SO WILL KEEP THE WARNING IN EFFECT TO ACCOUNT FOR THIS. LOCATIONS IN THE WARNING AREA INCLUDE MANSFIELD DAM...LAKEWAY...CEDAR PARK AND ANDERSON MILL. PRECAUTIONARY/PREPAREDNESS ACTIONS... IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS. && LAT...LON 3010 9776 3029 9804 3054 9787 3037 9759 $$
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, 4:59 PM CDT | Areal Flood Advisory | EWX | Williamson | 2 hr |
| Jul 15, 5:18 PM CDT | Flash Flood Warning | 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.