Alert archive / Texas / Flash Flood Warnings in 2016

Flash Flood Warning 49, NWS Austin/San Antonio, TX

May 31, 2016Comal County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 31, 2016, 2:53 PM CDT for Comal County, Texas. It was in force for 3 hr. 4 reports 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: May 31, 2016, 2:53 PM CDT (19:53 UTC)
Expired: May 31, 2016, 5:45 PM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Flood severity: None

County Comal County, TX

The radar

The Austin/San Antonio radar (KEWX), 29 km from the middle of the area, began a volume at 19:55 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

Time	Report	Where	Remark
May 31, 3:25 PM CDT	HEAVY RAIN 1.45	7 W New Braunfels, TX	1.45 INCHES OF RAIN IN 30 MINUTES
May 31, 3:40 PM CDT	HEAVY RAIN 2.47	6 Sse Spring Branch, TX	2.47 INCHES OF RAIN IN 2.2 HOURS
May 31, 3:42 PM CDT	HEAVY RAIN 2.23	New Braunfels, TX	2.23 INCHES OF RAIN IN ABOUT AN HOUR
May 31, 3:43 PM CDT	FLASH FLOOD	Gruene, TX	DUE TO A COMBINATION OF WATER RELEASES FROM CANYON LAKE PLUS LOCAL RUNOFF FROM THUNDERSTORMS...THE GUADALUPE RIVER HAS GONE OVER THE GRUENE BRIDGE

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

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 7.9 hours before the alert went out and 243 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: 2719 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

315 
WGUS54 KEWX 311953
FFWEWX
TXC091-312245-
/O.NEW.KEWX.FF.W.0049.160531T1953Z-160531T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
253 PM CDT TUE MAY 31 2016

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

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

* UNTIL 545 PM CDT

* AT 251 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  NEW BRAUNFELS...CANYON LAKE...SCHERTZ...SELMA...CANYON LAKE...
  BULVERDE...GARDEN RIDGE...FISCHER...SPRING BRANCH...ANHALT...
  HUNTER...BRACKEN...GRUENE...SATTLER AND STARTZVILLE.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN
THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

&&

LAT...LON 2985 9803 2976 9800 2968 9810 2959 9831
      2962 9834 2965 9834 2967 9838 2970 9838
      2972 9834 2973 9835 2972 9838 2975 9841
      2971 9843 2974 9845 2974 9853 2976 9855
      2975 9858 3003 9829

$$

PLATT

1 follow-up statement

699 
WGUS74 KEWX 312243
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
543 PM CDT TUE MAY 31 2016

TXC091-312251-
/O.EXP.KEWX.FF.W.0049.000000T0000Z-160531T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COMAL TX-
543 PM CDT TUE MAY 31 2016

...THE FLASH FLOOD WARNING FOR COMAL COUNTY WILL EXPIRE AT 545 PM
CDT...

HEAVY RAINFALL HAS ENDED OVER COMAL COUNTY AND FLASH FLOODING IS NO
LONGER EXPECTED TO POSE A THREAT. HOWEVER...RUNOFF FROM EARLIER
HEAVY RAINFALL WILL CONTINUE THROUGH THIS EVENING. PLEASE USE
CAUTION WHILE DRIVING IN THE AREA TODAY. PLEASE CONTINUE TO HEED ANY
REMAINING ROAD CLOSURES.

LAT...LON 2985 9803 2976 9800 2968 9810 2959 9831
      2962 9834 2965 9834 2967 9838 2970 9838
      2972 9834 2973 9835 2972 9838 2975 9841
      2971 9843 2974 9845 2974 9853 2976 9855
      2975 9858 3003 9829

$$

PLATT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 10:00 PM CDT	River Flood Warning	EWX	Bexar, Wilson	15 hr
May 31, 10:42 AM CDT	Special Weather Statement	EWX	Llano	48 min
May 31, 10:52 AM CDT	Flash Flood Watch	EWX	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more	4 days
May 31, 11:31 AM CDT	Areal Flood Advisory	EWX	Llano	3 hr
May 31, 11:52 AM CDT	Areal Flood Advisory	EWX	Edwards, Kerr, Real	3 hr
May 31, 12:05 PM CDT	Flash Flood Warning	EWX	Llano	3 hr
May 31, 12:29 PM CDT	Flash Flood Warning	EWX	Bandera, Gillespie, Kerr, Real	3 hr
May 31, 12:58 PM CDT	Flash Flood Warning	EWX	Medina, Uvalde	4 hr
May 31, 1:55 PM CDT	Special Weather Statement	EWX	Blanco	50 min
May 31, 2:05 PM CDT	Areal Flood Advisory	EWX	Bexar	3 hr
May 31, 2:15 PM CDT	Areal Flood Advisory	EWX	Blanco, Burnet, Gillespie, Kendall, Llano	3 hr
May 31, 2:21 PM CDT	River Flood Warning	EWX	Llano	20 hr
May 31, 2:25 PM CDT	River Flood Warning	EWX	Bandera	22 hr
May 31, 2:25 PM CDT	River Flood Warning	EWX	Bexar	4 days
May 31, 2:25 PM CDT	Special Weather Statement	EWX	Medina	50 min
May 31, 2:32 PM CDT	Areal Flood Advisory	EWX	Comal	3 hr
May 31, 2:35 PM CDT	River Flood Warning	EWX	Fayette	4 days
May 31, 2:40 PM CDT	Special Weather Statement	EWX	Hays	50 min
May 31, 2:56 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell, Comal, Guadalupe, Hays	64 min
May 31, 3:05 PM CDT	Special Weather Statement	EWX	Medina	40 min
May 31, 3:10 PM CDT	Special Weather Statement	EWX	Wilson	65 min
May 31, 3:24 PM CDT	Flash Flood Warning	EWX	Bexar	3 hr
May 31, 3:54 PM CDT	Areal Flood Advisory	EWX	Guadalupe	3 hr
May 31, 3:57 PM CDT	Special Weather Statement	EWX	Caldwell	48 min
May 31, 3:58 PM CDT	River Flood Warning	EWX	Comal, Guadalupe	18 hr
May 31, 4:01 PM CDT	River Flood Warning	EWX	Comal, Guadalupe	22 hr
May 31, 4:05 PM CDT	Special Weather Statement	EWX	Gonzales	40 min
May 31, 4:10 PM CDT	Areal Flood Advisory	EWX	Hays, Travis	3 hr
May 31, 4:15 PM CDT	Areal Flood Advisory	EWX	Caldwell	3 hr
May 31, 4:22 PM CDT	Special Weather Statement	EWX	Bastrop, Gonzales	38 min
May 31, 4:31 PM CDT	Special Weather Statement	EWX	Wilson	44 min
May 31, 4:34 PM CDT	Areal Flood Advisory	EWX	Williamson	3 hr
May 31, 4:52 PM CDT	Areal Flood Advisory	EWX	Atascosa, Gonzales, Karnes, Wilson	3 hr
May 31, 4:52 PM CDT	River Flood Warning	EWX	Llano	16 hr
May 31, 4:56 PM CDT	Severe Thunderstorm Warning	EWX	Karnes, Wilson	32 min
May 31, 5:13 PM CDT	Areal Flood Advisory	EWX	Bastrop, Fayette, Lee, Williamson	3 hr
May 31, 5:29 PM CDT	River Flood Warning	EWX	Blanco	20 hr
May 31, 5:29 PM CDT	Special Weather Statement	EWX	Karnes	46 min
May 31, 5:50 PM CDT	Flash Flood Warning	EWX	Fayette	3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.