Alert archive / Texas / Flash Flood Warnings in 2016

Flash Flood Warning 73, NWS Austin/San Antonio, TX

August 17, 2016Llano County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 17, 2016, 6:05 PM CDT for Llano County, Texas. It was in force for 115 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 17, 2016, 6:05 PM CDT (23:05 UTC)
Expired: Aug 17, 2016, 8:00 PM CDT
In force: 115 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Flood severity: None

County Llano County, TX

The radar

The Ft Hood radar (KGRK), 103 km from the middle of the area, began a volume at 23:05 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 12:00Z, 11.1 hours before the alert went out and 260 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 401 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

691 
WGUS54 KEWX 172305
FFWEWX
TXC299-180100-
/O.NEW.KEWX.FF.W.0073.160817T2305Z-160818T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
605 PM CDT WED AUG 17 2016

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

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

* UNTIL 800 PM CDT

* AT 603 PM CDT...DOPPLER RADAR INDICATED SHOWERS AND THUNDERSTORMS
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. 1 TO 3 INCHES OF RAIN
  HAS ALREADY FALLEN ACROSS SOUTHEAST LLANO COUNTY. AN ADDITIONAL 1
  TO 3 INCHES IS POSSIBLE ACROSS NORTHWEST LLANO COUNTY. FLASH
  FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  KINGSLAND...LLANO...BUCHANAN DAM...GAINESVILLE...GRANITE SHOALS...
  HORSESHOE BAY...BLUFFTON...VALLEY SPRING...PRAIRIE MOUNTAIN...
  OXFORD...TOW...LONE GROVE...BABY HEAD...FIELD CREEK...STOLZ...
  CASTELL...AND SUNRISE BEACH VILLAGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3088 9846 3086 9842 3083 9842 3084 9839
      3083 9838 3079 9843 3075 9843 3074 9837
      3070 9842 3068 9840 3067 9844 3060 9840
      3057 9841 3057 9837 3056 9835 3049 9835
      3050 9840 3050 9896 3092 9896 3092 9845

$$

RUNYEN

1 follow-up statement

972 
WGUS74 KEWX 180031
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
731 PM CDT WED AUG 17 2016

TXC299-180041-
/O.CAN.KEWX.FF.W.0073.000000T0000Z-160818T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LLANO TX-
731 PM CDT WED AUG 17 2016

...THE FLASH FLOOD WARNING FOR LLANO COUNTY IS CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 3088 9846 3086 9842 3083 9842 3084 9839
      3083 9838 3079 9843 3075 9843 3074 9837
      3070 9842 3068 9840 3067 9844 3060 9840
      3057 9841 3057 9837 3056 9835 3049 9835
      3050 9840 3050 9896 3092 9896 3092 9845

$$

RUNYEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 7:16 PM CDT	Areal Flood Advisory	EWX	Bastrop, Lee, Williamson	119 min
Aug 16, 9:25 PM CDT	River Flood Warning	EWX	Travis	14 hr
Aug 16, 10:58 PM CDT	Areal Flood Advisory	EWX	Travis	2 hr
Aug 16, 11:48 PM CDT	Flash Flood Warning	EWX	Travis	3 hr
Aug 17, 12:31 AM CDT	Flash Flood Warning	EWX	Burnet, Travis	3 hr
Aug 17, 2:01 AM CDT	Areal Flood Advisory	EWX	Burnet	3 hr
Aug 17, 3:56 AM CDT	Areal Flood Advisory	EWX	Bexar	2 hr
Aug 17, 4:12 AM CDT	Areal Flood Advisory	EWX	Williamson	2 hr
Aug 17, 6:37 AM CDT	River Flood Warning	EWX	Travis	16 hr
Aug 17, 12:03 PM CDT	Areal Flood Advisory	EWX	Bastrop, Caldwell, Travis, Williamson	3 hr
Aug 17, 4:49 PM CDT	Areal Flood Advisory	EWX	Kendall	116 min
Aug 17, 4:59 PM CDT	Areal Flood Advisory	EWX	Bexar	2 hr
Aug 17, 5:41 PM CDT	Areal Flood Advisory	EWX	Llano	2 hr
Aug 17, 5:48 PM CDT	Areal Flood Advisory	EWX	Bandera	117 min
Aug 17, 6:15 PM CDT	Flash Flood Warning	EWX	Bandera, Kendall, Kerr	3 hr
Aug 17, 6:43 PM CDT	Areal Flood Advisory	EWX	Medina	2 hr

Nearby

Flash Flood Warnings in Texas, 2016 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.