Alert archive / Texas / Flash Flood Warnings in 2016

Flash Flood Warning 85, NWS Austin/San Antonio, TX

August 21, 2016Atascosa County, Bexar County, Frio County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 21, 2016, 6:38 AM CDT for Atascosa County, Bexar County, Frio 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
Aug 21, 2016, 6:38 AM CDT (11:38 UTC)
Expired
Aug 21, 2016, 9:30 AM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Flood severity
None

Counties Atascosa County, TX, Bexar County, TX, Frio County, TX

The radar

The Austin/San Antonio radar (KEWX), 113 km from the middle of the area, began a volume at 11:40 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
Aug 21, 8:00 AM CDTFLASH FLOODSomerset, TXBEXAR COUNTY HIGH WATER DETECTION WEBSITE INDICATES MULTIPLE ROAD CLOSURES DUE TO HIGH WATER NEAR SOMERSET IN SOUTHWEST BEXAR COUNTY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Del Rio, TX (KDLF), launched 00:00Z, 11.6 hours before the alert went out and 189 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, Del Rio, TX at 00:00Z on 2016-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 988 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, Del Rio, TX at 00:00Z on 2016-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.1939Sfc1 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
988 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1147 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
24 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

139 
WGUS54 KEWX 211138
FFWEWX
TXC013-029-163-211430-
/O.NEW.KEWX.FF.W.0085.160821T1138Z-160821T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
638 AM CDT SUN AUG 21 2016

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN BEXAR COUNTY IN SOUTH CENTRAL TEXAS...
  FRIO COUNTY IN SOUTH CENTRAL TEXAS...
  NORTHWESTERN ATASCOSA COUNTY IN SOUTH CENTRAL TEXAS...

* UNTIL 930 AM CDT

* AT 635 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED MULTIPLE
  ROAD CLOSURES IN BEXAR...ATASCOSA AND FRIO COUNTIES. FLASH
  FLOODING IS OCCURRING AND ADDITIONAL ONE HALF TO ONE INCH OF
  RAINFALL IS POSSIBLE OVER THE ALREADY FLOODED AREAS.

* SOME LOCATIONS THAT WILL CONTINUE TO EXPERIENCE FLOODING INCLUDE...
  PARTS OF SAN ANTONIO...PEARSALL...DILLEY...POTEET...MOORE...
  LYTLE...ST. HEDWIG...SOMERSET...ELMENDORF...FRIO TOWN...
  GOLDFINCH...CALAVERAS LAKE...LACKLAND AFB...NORTH PEARSALL...
  WEST PEARSALL...SCHATTEL...BIGFOOT...LEMING...DIVOT AND BIG FOOT.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 2907 9941 2909 9937 2909 9880 2945 9880
      2945 9813 2911 9840 2893 9869 2865 9881
      2864 9941

$$
1 follow-up statement
093 
WGUS74 KEWX 211432
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
932 AM CDT SUN AUG 21 2016

TXC013-029-163-211439-
/O.EXP.KEWX.FF.W.0085.000000T0000Z-160821T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-FRIO TX-ATASCOSA TX-
932 AM CDT SUN AUG 21 2016

...THE FLASH FLOOD WARNING FOR SOUTHERN BEXAR...FRIO AND NORTHWESTERN
ATASCOSA COUNTIES WILL EXPIRE AT 930 AM CDT...

THE HEAVY RAIN HAS ENDED. MANY ROADS ACROSS THE WARNED AREA HOWEVER
WILL CONTINUE TO SEE RESIDUAL FLOODING THROUGH THE REST OF THE
MORNING AND EVEN INTO THE AFTERNOON HOURS AS WATERS WILL BE SLOW TO
RECEDE. MANY ROADS WILL REMAIN CLOSED.  PLEASE CONTINUE TO HEED ANY
REMAINING ROAD CLOSURES AND USE EXTREME CAUTION IF DRIVING TODAY.
AVOID FLOODED LOW WATER CROSSINGS.  TURN AROUND DON'T DROWN.

LAT...LON 2907 9941 2909 9937 2909 9880 2945 9880
      2945 9813 2911 9840 2893 9869 2865 9881
      2864 9941

$$

YURA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 7:03 PM CDTFlash Flood WarningEWXAtascosa, Gonzales, Guadalupe, Wilson9 hr
Aug 20, 9:15 PM CDTAreal Flood AdvisoryEWXFayette, Gonzales, Lavaca3 hr
Aug 20, 9:46 PM CDTRiver Flood WarningEWXGonzales3 days
Aug 20, 10:59 PM CDTAreal Flood AdvisoryEWXBexar3 hr
Aug 20, 11:23 PM CDTRiver Flood WarningEWXTravis14 hr
Aug 20, 11:32 PM CDTAreal Flood AdvisoryEWXDeWitt, Gonzales, Karnes3 hr
Aug 21, 12:39 AM CDTRiver Flood WarningEWXKarnes38 hr
Aug 21, 12:45 AM CDTAreal Flood AdvisoryEWXLee, Williamson3 hr
Aug 21, 12:50 AM CDTAreal Flood AdvisoryEWXDeWitt3 hr
Aug 21, 1:04 AM CDTAreal Flood AdvisoryEWXAtascosa, Frio3 hr
Aug 21, 1:39 AM CDTAreal Flood AdvisoryEWXBexar3 hr
Aug 21, 1:48 AM CDTFlash Flood WarningEWXAtascosa, Bexar, Frio5 hr
Aug 21, 1:54 AM CDTAreal Flood AdvisoryEWXBastrop, Travis3 hr
Aug 21, 2:27 AM CDTAreal Flood AdvisoryEWXComal3 hr
Aug 21, 3:06 AM CDTFlash Flood WarningEWXComal3 hr
Aug 21, 3:17 AM CDTAreal Flood AdvisoryEWXTravis, Williamson3 hr
Aug 21, 3:29 AM CDTRiver Flood WarningEWXDeWitt58 hr
Aug 21, 4:03 AM CDTRiver Flood WarningEWXKarnes24 hr
Aug 21, 4:07 AM CDTAreal Flood AdvisoryEWXMedina113 min
Aug 21, 5:04 AM CDTAreal Flood AdvisoryEWXBexar116 min
Aug 21, 5:17 AM CDTFlash Flood WarningEWXMedina3 hr
Aug 21, 5:21 AM CDTRiver Flood WarningEWXGonzales20 hr
Aug 21, 5:41 AM CDTRiver Flood WarningEWXBexar, Wilson49 hr
Aug 21, 5:41 AM CDTRiver Flood WarningEWXBexar23 hr
Aug 21, 5:52 AM CDTFlash Flood WarningEWXComal113 min
Aug 21, 6:01 AM CDTAreal Flood AdvisoryEWXKendall3 hr
Aug 21, 6:19 AM CDTAreal Flood AdvisoryEWXTravis, Williamson116 min
Aug 21, 8:41 AM CDTAreal Flood AdvisoryEWXUvalde, Zavala2 hr
Aug 21, 9:23 AM CDTFlash Flood WarningEWXZavala3 hr
Aug 21, 10:55 AM CDTAreal Flood AdvisoryEWXDeWitt, Gonzales, Guadalupe, Karnes, Wilson110 min
Aug 21, 11:25 AM CDTFlash Flood WarningEWXDeWitt, Gonzales, Guadalupe, Karnes, Wilson5 hr
Aug 21, 2:42 PM CDTAreal Flood AdvisoryEWXFayette2 hr

Nearby

Flash Flood Warnings in Texas, 2016Every flash flood warning in 2016

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.