Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 91, NWS Austin/San Antonio, TX

May 27, 2015Blanco County, Comal County, Hays County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 27, 2015, 12:09 PM CDT for Blanco County, Comal County, Hays 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 27, 2015, 12:09 PM CDT (17:09 UTC)
Expired
May 27, 2015, 3:15 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Flood severity
None

Counties Blanco County, TX, Comal County, TX, Hays County, TX

The radar

The Austin/San Antonio radar (KEWX), 44 km from the middle of the area, began a volume at 17:09 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

Del Rio, TX (KDLF), launched 12:00Z, 5.2 hours before the alert went out and 258 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 12:00Z on 2015-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3197 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 12:00Z on 2015-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 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
3197 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
633 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
200 m²/s²
Significant tornado parameter
2.4
Supercell composite
13.0

Open this sounding in Storm Lab

The text

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

664 
WGUS54 KEWX 271709
FFWEWX
TXC031-091-209-272015-
/O.NEW.KEWX.FF.W.0091.150527T1709Z-150527T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1209 PM CDT WED MAY 27 2015

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL COMAL COUNTY IN SOUTH CENTRAL TEXAS...
  WEST CENTRAL HAYS COUNTY IN SOUTH CENTRAL TEXAS...
  SOUTH CENTRAL BLANCO COUNTY IN SOUTH CENTRAL TEXAS...

* UNTIL 315 PM CDT
    
* AT 1208 PM CDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAS 
  BEEN ESTIAMTED TO HAVE FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN 
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  TWIN SISTERS AND THE LITTLE BLANCO RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

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

&&

LAT...LON 3005 9813 2991 9833 3003 9847 3015 9835

$$

RUNYEN
2 follow-up statements
726 
WGUS74 KEWX 271758
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1258 PM CDT WED MAY 27 2015

TXC031-091-209-272015-
/O.CON.KEWX.FF.W.0091.000000T0000Z-150527T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COMAL TX-HAYS TX-BLANCO TX-
1258 PM CDT WED MAY 27 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM CDT FOR
NORTH CENTRAL COMAL...WEST CENTRAL HAYS AND SOUTH CENTRAL BLANCO
COUNTIES...

AT 1254 PM CDT...DOPPLER RADAR INDICATED EARLIER THUNDERSTORMS 
PRODUCED 1 1/2 TO 2 INCHES OF RAINFALL ACROSS THE WARNED AREA.  
FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...TWIN SISTERS. 

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...LITTLE BLANCO 
RIVER.

WHILE RAINFALL HAS ENDED...RUNOFF FROM EARLIER HEAVY RAINFALL WILL 
CONTINUE THE FLASH FLOODING THREAT OF LOW WATER CROSSING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3005 9813 2991 9833 3003 9847 3015 9835

$$

RUNYEN
190 
WGUS74 KEWX 271910
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
210 PM CDT WED MAY 27 2015

TXC031-091-209-271919-
/O.CAN.KEWX.FF.W.0091.000000T0000Z-150527T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COMAL TX-HAYS TX-BLANCO TX-
210 PM CDT WED MAY 27 2015

...THE FLASH FLOOD WARNING FOR NORTH CENTRAL COMAL...WEST CENTRAL
HAYS AND SOUTH CENTRAL BLANCO COUNTIES IS CANCELLED...

THE FLASH FLOOD THREAT IS ENDING. PLEASE CONTINUE TO HEED ANY ROAD 
CLOSURES AND BE ALERT FOR FLOODING OF LOW WATER CROSSINGS.

LAT...LON 3005 9813 2991 9833 3003 9847 3015 9835

$$

RUNYEN

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 5:32 AM CDTFlash Flood WarningEWXFayette, Lee118 min
May 27, 10:12 AM CDTAreal Flood AdvisoryEWXHays, Travis2 hr
May 27, 10:30 AM CDTSevere Thunderstorm WarningEWXTravis45 min
May 27, 11:01 AM CDTFlash Flood WarningEWXHays, Travis2 hr
May 27, 11:15 AM CDTSevere Thunderstorm WarningEWXTravis19 min
May 27, 11:19 AM CDTSevere Thunderstorm WarningEWXBlanco, Comal, Hays41 min
May 27, 11:47 AM CDTTornado Warning Tornado observedEWXBlanco27 min
May 27, 12:00 PM CDTSevere Thunderstorm WarningEWXBlanco, Hays20 min
May 27, 12:48 PM CDTSpecial Weather StatementEWXGillespie27 min
May 27, 12:52 PM CDTFlash Flood WatchEWXBastrop, Blanco, Burnet, Caldwell, Gillespie, Hays and 4 more8 hr
May 27, 1:38 PM CDTSpecial Weather StatementEWXLlano52 min

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.