Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 10, NWS Austin/San Antonio, TX

May 5, 2015Travis County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 5, 2015, 10:56 PM CDT for Travis County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 5, 2015, 10:56 PM CDT (03:56 UTC)
Expired
May 6, 2015, 1:45 AM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Flood severity
None

County Travis County, TX

The radar

The Ft Hood radar (KGRK), 59 km from the middle of the area, began a volume at 04:00 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.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 3.9 hours before the alert went out and 281 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.

Skew-T log-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2015-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1109 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2015-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 137 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1109 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
942 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
137 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.8
Supercell composite
7.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

581 
WGUS54 KEWX 060356
FFWEWX
TXC453-060645-
/O.NEW.KEWX.FF.W.0010.150506T0356Z-150506T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1056 PM CDT TUE MAY 5 2015

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL TRAVIS COUNTY IN SOUTH CENTRAL TEXAS...

* UNTIL 145 AM CDT
    
* AT 1051 PM CDT...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED 
  HEAVY RAINS AND FLASH FLOODING CONTINUES ACROSS WESTERN AND 
  CENTRAL PARTS OF THE AUSTIN METRO AREA. AT 1015 PM...THE RIVER 
  GAUGE AT SHOAL CREEK NEAR WEST 12TH STREET IN AUSTIN HAS REACHED 
  NEAR 14 FEET...OR AT A LEVEL CLOSE ENOUGH TO THREATEN BUSINESS 
  PROPERTIES NEAR WEST 6TH STREET AND LAMAR BOULEVARD. ADDITIONAL 
  HEAVY RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE EXPECTED TO REMAIN 
  POSSIBLE OVER AUSTIN THROUGH MIDNIGHT CDT.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  AUSTIN...BEE CAVE...WEST LAKE HILLS...ROLLINGWOOD...MANSFIELD
  DAM...BARTON CREEK...HUDSON BEND...SUNSET VALLEY...CAMP MABRY...
  LOST CREEK AND WELLS BRANCH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT
TO FLOODING WHEN WATER BEGINS RISING.

REMAIN ALERT FOR FLOODING EVEN IN LOCATIONS NOT RECEIVING RAIN.
CREEKS...STREAMS AND RIVERS CAN BECOME RAGING KILLER CURRENTS IN A
MATTER OF MINUTES.

&&

LAT...LON 3042 9778 3044 9768 3027 9776 3018 9789
      3023 9797 3048 9789

$$

OAKS
1 follow-up statement
105 
WGUS74 KEWX 060641
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
141 AM CDT WED MAY 6 2015

TXC453-060651-
/O.EXP.KEWX.FF.W.0010.000000T0000Z-150506T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TRAVIS TX-
141 AM CDT WED MAY 6 2015

...THE FLASH FLOOD WARNING FOR CENTRAL TRAVIS COUNTY WILL EXPIRE AT
145 AM CDT...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.

LAT...LON 3042 9778 3044 9768 3027 9776 3018 9789
      3023 9797 3048 9789

$$

HAMPSHIRE

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 5, 7:08 PM CDTAreal Flood AdvisoryEWXBlanco, Burnet, Comal, Hays, Travis, Williamson3 hr
May 5, 8:21 PM CDTFlash Flood WarningEWXTravis3 hr
May 5, 8:59 PM CDTAreal Flood AdvisoryEWXTravis, Williamson3 hr
May 5, 9:21 PM CDTFlash Flood WarningEWXTravis3 hr
May 5, 10:17 PM CDTFlash Flood WatchEWXBastrop, Caldwell, Comal, DeWitt, Fayette, Gonzales and 6 more7 hr
May 6, 12:10 AM CDTFlash Flood WarningEWXBastrop, Travis110 min
May 6, 1:38 AM CDTSpecial Weather StatementEWXLee37 min
May 6, 1:55 AM CDTFlash Flood WarningEWXBastrop, Lee, Williamson3 hr
May 6, 2:15 AM CDTSpecial Weather StatementEWXLee30 min
May 6, 2:29 AM CDTSevere Thunderstorm WarningEWXLee31 min
May 6, 3:00 AM CDTSevere Thunderstorm WarningEWXLee60 min
May 6, 3:19 AM CDTAreal Flood WarningEWXTravis3 hr
May 6, 4:25 AM CDTFlash Flood WarningEWXBastrop, Lee, Williamson4 hr
May 6, 6:13 AM CDTAreal Flood AdvisoryEWXTravis2 hr
May 6, 8:04 AM CDTAreal Flood AdvisoryEWXBastrop, Lee, Travis, Williamson3 hr

Nearby

Flash Flood Warnings in Texas, 2015Every flash flood warning in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.