Alert archive / Texas / Flash Flood Warnings in 2014

Flash Flood Warning 32, NWS Austin/San Antonio, TX

July 18, 2014Williamson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 18, 2014, 1:18 AM CDT for Williamson County, Texas. It was in force for 3 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
Jul 18, 2014, 1:18 AM CDT (06:18 UTC)
Expired
Jul 18, 2014, 4:15 AM CDT
In force
3 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), 13 km from the middle of the area, began a volume at 06:20 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

TimeReportWhereRemark
Jul 18, 4:13 AM CDTFLASH FLOOD1 Sse Granger, TXCR 347 NORTH OF CR 346 AT OPOSSUM CREEK CLOSED DUE TO FLOODING VIA ATXFLOODS.

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 00:00Z, 6.3 hours before the alert went out and 248 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 2014-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2014-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
21 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
543 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

592 
WGUS54 KEWX 180618
FFWEWX
TXC491-180915-
/O.NEW.KEWX.FF.W.0032.140718T0618Z-140718T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
118 AM CDT FRI JUL 18 2014

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN WILLIAMSON COUNTY IN SOUTH CENTRAL TEXAS...
  THIS INCLUDES THE CITIES OF...TAYLOR...GRANGER...

* UNTIL 415 AM CDT

* AT 114 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE   
  FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA. DOPPLER
  RADAR ESTIMATES SUGGEST THAT RAINFALL TOTALS OF 2 TO 4 INCHES OF
  RAIN HAVE ALREADY FALLEN OVER EASTERN WILLIAMSON COUNTY...
  INCLUDING GRANGER AND TAYLOR. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WEIR...
  THRALL...GRANGER AND TAYLOR. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE IN
THE WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

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

&&

LAT...LON 3073 9728 3048 9718 3043 9733 3048 9741
      3055 9766 3083 9754

$$
1 follow-up statement
457 
WGUS74 KEWX 180743
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
243 AM CDT FRI JUL 18 2014

TXC491-180915-
/O.CON.KEWX.FF.W.0032.000000T0000Z-140718T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WILLIAMSON TX-
243 AM CDT FRI JUL 18 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM CDT FOR
EASTERN WILLIAMSON COUNTY...

AT 228 AM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT SHOWERS 
AND THUNDERSTORMS PRODUCING MODERATE TO HEAVY RAIN OVER EASTERN
WILLIAMSON COUNTY. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WEIR...
THRALL...GRANGER DAM AND GRANGER

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF UP TO 1 INCH REMAIN POSSIBLE IN
THE WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 3073 9728 3048 9718 3043 9733 3048 9741
      3055 9766 3083 9754

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 7:55 PM CDTSpecial Weather StatementEWXEdwards50 min
Jul 17, 8:37 PM CDTSevere Thunderstorm WarningEWXEdwards53 min
Jul 17, 8:48 PM CDTAreal Flood AdvisoryEWXEdwards102 min
Jul 17, 9:07 PM CDTSpecial Weather StatementEWXLee38 min
Jul 17, 9:25 PM CDTAreal Flood AdvisoryEWXLee2 hr
Jul 17, 9:35 PM CDTSpecial Weather StatementEWXEdwards, Val Verde40 min
Jul 17, 10:22 PM CDTAreal Flood AdvisoryEWXVal Verde2 hr
Jul 17, 10:22 PM CDTAreal Flood AdvisoryEWXTravis, Williamson2 hr
Jul 17, 10:59 PM CDTAreal Flood AdvisoryEWXBastrop2 hr
Jul 17, 11:01 PM CDTFlash Flood WarningEWXTravis, Williamson3 hr
Jul 17, 11:16 PM CDTAreal Flood AdvisoryEWXBexar104 min
Jul 17, 11:38 PM CDTAreal Flood AdvisoryEWXComal112 min
Jul 18, 12:21 AM CDTAreal Flood AdvisoryEWXKendall, Kerr99 min
Jul 18, 12:32 AM CDTFlash Flood WarningEWXBexar3 hr
Jul 18, 12:45 AM CDTAreal Flood AdvisoryEWXWilliamson105 min
Jul 18, 1:23 AM CDTFlash Flood WarningEWXBexar3 hr
Jul 18, 1:59 AM CDTFlash Flood WarningEWXTravis, Williamson3 hr
Jul 18, 2:11 AM CDTFlash Flood WarningEWXMedina3 hr
Jul 18, 2:35 AM CDTFlash Flood WarningEWXBexar3 hr
Jul 18, 2:53 AM CDTAreal Flood AdvisoryEWXBastrop, Lee2 hr
Jul 18, 3:19 AM CDTAreal Flood AdvisoryEWXAtascosa, Frio2 hr
Jul 18, 4:16 AM CDTFlash Flood WarningEWXUvalde3 hr
Jul 18, 4:21 AM CDTFlash Flood WarningEWXFrio3 hr
Jul 18, 4:49 AM CDTAreal Flood AdvisoryEWXAtascosa2 hr
Jul 18, 6:35 AM CDTAreal Flood AdvisoryEWXDimmit115 min
Jul 18, 7:49 AM CDTRiver Flood WarningEWXWilliamson20 hr

Nearby

Flash Flood Warnings in Texas, 2014Every flash flood warning in 2014

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.