Alert archive / Texas / Flash Flood Warnings in 2009

Flash Flood Warning 5, NWS Austin/San Antonio, TX

April 27, 2009Val Verde County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Apr 27, 2009, 11:00 AM CDT for Val Verde County, Texas. It was in force for 39 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: Apr 27, 2009, 11:00 AM CDT (16:00 UTC)
Expired: Apr 27, 2009, 11:39 AM CDT
In force: 39 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Flood severity: None

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 133 km from the middle of the area, began a volume at 16:01 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 4.0 hours before the alert went out and 82 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: 2567 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 10.9

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 271600
FFWEWX
TXC465-271900-
/O.NEW.KEWX.FF.W.0005.090427T1600Z-090427T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1100 AM CDT MON APR 27 2009

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  VAL VERDE COUNTY...

* UNTIL 200 PM CDT.

* AT 1048 AM CDT...THE NATIONAL WEATHER SERVICE HAS DETERMINED
  THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE FLASH
  FLOODING FROM SHOWERS AND THUNDERSTORM IS LIKELY OVER THE 
  NORTHERN HALF OF VAL VERDE COUNTY. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LOMA
  ALTA...PUMPVILLE...PANDALE AND JUNO.

SHOWERS AND THUNDERSTORMS CONTINUED OVER THE NORTHERN HALF OF
VAL VERDE COUNTY FROM LANGTRY AND EXTENDING EAST TO THE 
INTERSECTION OF HIGHWAY 277 AND HIGHWAY 377.  LOCALLY HEAVY
RAINS FROM SHOWERS AND THUNDERSTORMS WILL CONTINUE FOR THE
NEXT FEW HOURS...AND COULD CAUSE FLOODING AT LOW WATER CROSSINGS
AND IN LOW LYING AREAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN WATER COVERS THE ROAD...TURN AROUND DONT DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.

&&

LAT...LON 3029 10176 3028 10072 2969 10073 2970 10139
      2973 10141 2977 10147 2976 10155 2978 10156
      2976 10158 2976 10162 2975 10165 2975 10171
      2978 10176

$$

1 follow-up statement

000 
WGUS74 KEWX 271639
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1139 AM CDT MON APR 27 2009

TXC465-271647-
/O.CAN.KEWX.FF.W.0005.000000T0000Z-090427T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
VAL VERDE TX-
1139 AM CDT MON APR 27 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR VAL VERDE COUNTY...

THE AREA OF HEAVY RAIN OVER THE NORTHERN HALF OF VAL VERDE COUNTY 
HAS DECREASED IN STRENGTH DURING THE PAST HALF HOUR.  SOME AREAS
OF LOCALLY HEAVY RAIN ARE STILL POSSIBLE IN THE NEXT 1 TO 2 HOURS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 PM CDT MONDAY AFTERNOON
FOR SOUTH CENTRAL TEXAS. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 100 PM CDT MONDAY AFTERNOON FOR SOUTH CENTRAL TEXAS.

LAT...LON 3029 10176 3028 10072 2969 10073 2970 10139
      2973 10141 2977 10147 2976 10155 2978 10156
      2976 10158 2976 10162 2975 10165 2975 10171
      2978 10176

$$

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this flash flood warning went out at Apr 27, 10:44 AM CDT, 16 minutes earlier.

Area forecast discussion, Apr 27, 10:44 AM CDT, 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1044 AM CDT MON APR 27 2009

.UPDATE...
LARGE OUTFLOW BOUNDARY EXTENDING FROM WESTERN LEE COUNTY TO NORTHERN
BEXAR COUNTY AND WESTWARD TO NORTH CENTRAL VAL VERDE COUNTY. SO
FAR..THE SEVERE THREAT HAS BEEN LIMITED WITH MOSTLY LOCALLY HEAVY
RAINS. DISTURBANCES WILL BE SWEEPING EASTWARD TODAY AS THE
BOUNDARY SAGS SOUTHWARD. EXPECT CONTINUED ELEVATED CONVECTION
BEHIND THE BOUNDARY AND WITH DAYTIME HEATING..POTENTIALLY SEVERE
CONVECTION FIRING ALONG THE BOUNDARY LATER THIS AFTERNOON.

&&

.PREV DISCUSSION... /ISSUED 728 AM CDT MON APR 27 2009/

UPDATE...
QUICK UPDATE MADE FOR TOR 198 VALID UNTIL 1 PM AND ISSUE A FLASH
FLOOD WATCH VALID UNTIL 4 PM. DEVELOPING SURFACE BOUNDARY ALONG
WITH BACKBUILDING/TRAINING STORMS WITH STRONG LOW LEVEL INFLOW
AND AN APPROACHING SHORT WAVE WILL RESULT IN LOCALLY HEAVY
RAINFALL OF 2 TO 4 INCHES TODAY...ISOLATED TOTALS TO NEAR 5
INCHES.

PREV DISCUSSION... /ISSUED 652 AM CDT MON APR 27 2009/

AVIATION...
GENERAL MVFR CEILINGS, OCCASIONALLY RISING TO VFR IN THE
AFTERNOON, WILL PERSIST THROUGH THE PERIOD. NUMEROUS SHOWERS WILL
DRIFT SOUTH TOWARD KAUS DURING THE LATE MORNING HOURS, WITH
WIDELY SCATTERED THUNDERSTORMS DEVELOPING DURING THE AFTERNOON
HOURS.

PREV DISCUSSION... /ISSUED 417 AM CDT MON APR 27 2009/

DISCUSSION...
STRONG TO MARGINALLY SEVERE STORMS OVER THE EASTERN HILL COUNTRY
EARLIER THIS MORNING HAVE TRANSITIONED INTO LOCALLY HEAVY RAINS.
STREAMER SHOWERS CONTINUE TO FEED INTO THE STORM CLUSTER MOVING
NEWD ACROSS N AUSTIN/ROUND ROCK/GEORGETOWN...BUT MOVING AT FAST
ENOUGH PACE TO ONLY WARRANT FLOOD ADVISORY AT THIS TIME. MAIN
CONCERN THIS MORNING IS MORE FOR HEAVY RAIN AS POSSIBLE BOUNDARY
DROPS INTO THE NRN CWA. BOUNDARY WOULD PROVIDE A FOCUS FOR THE
STRONG INFLOW OF LOW LEVEL GULF MOISTURE AS THE NEXT IN A SERIES
OF SHORT WAVES APPROACH FROM THE WEST AND TRACK ENEWD ACROSS
CENTRAL TX TODAY AND TONIGHT. WILL MENTION LOCALLY HEAVY RAIN FOR
THE NRN THIRD OF THE CWA THIS MORNING AND POSSIBLE SEVERE FOR THE
AFTERNOON/EARLY EVENING OVER THE CENTRAL/EASTERN CWA. SHORT WAVE
ACTIVITY SHIFTS SLIGHTLY NORTHWARD BY TUESDAY/WEDNESDAY AND HAVE
TAPERED OFF POPS NORTH AND ENDED SOUTH.

MUCH UNCERTAINTY FOR LATE THIS WEEK INTO THE WEEKEND AS LONG
RANGE MODELS DIFFER DRASTICALLY ON TIMING OF A COLD FRONT WITH
GFS INDICATING THE FRONT INTO THE CWA FRIDAY WHILE THE ECMWF MUCH
SLOWER WITH LATE SUNDAY/MONDAY MORNING. HAVE TRENDED SLOWER WITH
THE TIMING OF THE FRONT BUT WILL KEEP LOW POPS IN FOR THE WEEKEND
SIMILAR TO PREVIOUS PACKAGE AND SURROUNDING OFFICES.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              84  72  85  70  85 /  60  30  20  10  20
AUSTIN BERGSTROM INTL AIRPORT  84  71  84  69  85 /  50  30  20  10  20
NEW BRAUNFELS MUNI AIRPORT     84  72  85  69  86 /  40  20  10  10  20
BURNET MUNI AIRPORT            82  69  83  68  82 /  60  30  20  20  20
DEL RIO INTL AIRPORT           88  74  89  73  90 /  40  -   10  10  10
GEORGETOWN MUNI AIRPORT        82  71  83  69  83 /  60  30  20  20  20
HONDO MUNI AIRPORT             84  73  85  72  87 /  40  10  10  10  10
SAN MARCOS MUNI AIRPORT        84  71  85  69  85 /  50  20  20  10  20
LA GRANGE - FAYETTE REGIONAL   82  72  85  70  85 /  40  30  20  10  20
SAN ANTONIO INTL AIRPORT       83  72  85  70  85 /  40  10  10  10  10
STINSON MUNI AIRPORT           84  72  86  71  86 /  40  10  10  10  10

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH UNTIL 4 PM CDT THIS AFTERNOON FOR THE FOLLOWING
COUNTIES: BLANCO...BURNET...GILLESPIE...HAYS...KENDALL...KERR...
LLANO...TRAVIS...WILLIAMSON.

&&

02/18

Hazardous weather outlook, Apr 27, 8:02 AM CDT, 2 hours 58 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
802 AM CDT MON APR 27 2009

TXZ171>173-183>194-202>209-217>225-228-281315-
LLANO-BURNET-WILLIAMSON-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-
GILLESPIE-KENDALL-BLANCO-HAYS-TRAVIS-BASTROP-LEE-KINNEY-UVALDE-
MEDINA-BEXAR-COMAL-GUADALUPE-CALDWELL-FAYETTE-MAVERICK-ZAVALA-
FRIO-ATASCOSA-WILSON-KARNES-GONZALES-DE WITT-LAVACA-DIMMIT-
802 AM CDT MON APR 27 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...TODAY AND TONIGHT...

LOCALLY HEAVY RAINFALL POSSIBLE OVER THE HILL COUNTRY AND NORTHERN
PARTS OF SOUTH CENTRAL TEXAS. RAINFALL TOTALS OF TWO TO FIVE
INCHES CAN BE EXPECTED. ALSO THERE IS A SLIGHT RISK OF SEVERE
THUNDERSTORMS ACROSS THE HILL COUNTRY AND SOUTH CENTRAL TEXAS. THE
MAIN THREATS ARE DAMAGING WINDS AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Local storm report, Apr 27, 5:32 AM CDT, 5 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
532 AM CDT MON APR 27 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0415 AM     TSTM WND DMG     8 ESE GEORGETOWN        30.60N 97.56W
04/27/2009                   WILLIAMSON         TX   LAW ENFORCEMENT

            POWER LINES SNAPPED, TREES DOWN, SEVERE DAMAGE TO A PORCH

&&

MITCHELL

Local storm report, Apr 27, 5:34 AM CDT, 5 hours 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
534 AM CDT MON APR 27 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0415 AM     HAIL             8 ESE GEORGETOWN        30.60N 97.56W
04/27/2009  E0.25 INCH       WILLIAMSON         TX   PUBLIC

            PEA SIZE HAIL AND GUSTY WINDS

&&

MITCHELL

Local storm report, Apr 27, 7:14 AM CDT, 3 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
714 AM CDT MON APR 27 2009

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0419 AM     TSTM WND DMG     9 E GEORGETOWN          30.65N  97.53W
04/27/2009                   WILLIAMSON         TX   EMERGENCY MNGR

            BETWEEN 12 TO 15 HOMES DAMAGE JUST WEST OF JONAH.
            DAMAGE IS MAINLY DUE TO WINDS AND TREES BEING BLOWN ONTO
            HOMES.

&&

EVENT NUMBER 00527

MCDONALD

Local storm report, Apr 27, 9:17 AM CDT, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
917 AM CDT MON APR 27 2009

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

1259 AM     TSTM WND DMG     2 N WILLOW CITY         30.43N  98.70W
04/27/2009                   GILLESPIE          TX   PARK SERVICE

            NUMEROUS TREES WERE BLOWN OVER JUST NORTH OF WILLOW
            CITY ON HIGHWAY 16.

&&

EVENT NUMBER 00528

MCDONALD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 9:42 PM CDT	Tornado Warning	EWX	Edwards	33 min
Apr 26, 10:13 PM CDT	Tornado Warning	EWX	Edwards, Kerr	32 min
Apr 26, 10:42 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr	48 min
Apr 27, 12:11 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie	49 min
Apr 27, 3:20 AM CDT	Areal Flood Advisory	EWX	Travis, Williamson	115 min
Apr 27, 4:28 AM CDT	Tornado Warning	EWX	Williamson	32 min
Apr 27, 4:48 AM CDT	Tornado Warning	EWX	Williamson	27 min
Apr 27, 7:11 AM CDT	Flood Watch	EWX	Blanco, Burnet, Gillespie, Hays, Kendall, Kerr and 3 more	8 min
Apr 27, 7:19 AM CDT	Flash Flood Watch	EWX	Blanco, Burnet, DeWitt, Fayette, Gillespie, Gonzales and 8 more	11 hr
Apr 27, 9:14 AM CDT	Areal Flood Advisory	EWX	Burnet, Gillespie, Llano	2 hr
Apr 27, 9:53 AM CDT	Areal Flood Advisory	EWX	Edwards, Val Verde	112 min
Apr 27, 11:22 AM CDT	Areal Flood Advisory	EWX	Bandera, Blanco, Burnet, Gillespie, Kendall, Kerr and 2 more	113 min
Apr 27, 11:30 AM CDT	Areal Flood Advisory	EWX	Edwards	2 hr
Apr 27, 11:46 AM CDT	Areal Flood Advisory	EWX	Kinney, Uvalde, Val Verde	119 min
Apr 27, 11:58 AM CDT	Areal Flood Advisory	EWX	Bastrop, Bexar, Caldwell, Comal, Guadalupe, Hays and 5 more	2 hr
Apr 27, 12:30 PM CDT	Areal Flood Advisory	EWX	DeWitt, Fayette, Gonzales, Karnes, Lavaca	2 hr
Apr 27, 12:53 PM CDT	Areal Flood Advisory	EWX	Bandera, Blanco, Burnet, Gillespie, Kendall, Kerr and 2 more	3 hr
Apr 27, 1:01 PM CDT	River Flood Warning	EWX	Val Verde	7 hr
Apr 27, 1:07 PM CDT	Flash Flood Warning	EWX	Hays, Travis, Williamson	2 hr
Apr 27, 1:14 PM CDT	Flash Flood Warning	EWX	Bandera, Gillespie, Kendall, Kerr	116 min
Apr 27, 1:34 PM CDT	Flash Flood Warning	EWX	Caldwell, Gonzales, Guadalupe, Wilson	3 hr
Apr 27, 1:53 PM CDT	Flash Flood Warning	EWX	Blanco, Comal	95 min
Apr 27, 1:54 PM CDT	Severe Thunderstorm Warning	EWX	Gonzales, Guadalupe, Wilson	66 min
Apr 27, 2:08 PM CDT	Flash Flood Warning	EWX	Bexar	84 min
Apr 27, 2:26 PM CDT	Flash Flood Warning	EWX	Fayette	3 hr
Apr 27, 2:30 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell, Gonzales, Guadalupe, Wilson	60 min
Apr 27, 2:44 PM CDT	Areal Flood Advisory	EWX	DeWitt, Karnes, Lavaca	2 hr
Apr 27, 3:16 PM CDT	Flash Flood Warning	EWX	DeWitt, Karnes, Lavaca	3 hr
Apr 27, 3:28 PM CDT	Severe Thunderstorm Warning	EWX	DeWitt, Gonzales, Karnes	62 min
Apr 27, 3:40 PM CDT	Tornado Warning	EWX	DeWitt, Gonzales, Karnes	50 min
Apr 27, 4:04 PM CDT	Tornado Warning	EWX	DeWitt	26 min
Apr 27, 4:06 PM CDT	Severe Thunderstorm Warning	EWX	DeWitt, Gonzales, Lavaca	39 min
Apr 27, 4:23 PM CDT	Tornado Warning	EWX	DeWitt, Lavaca	52 min

Nearby

Flash Flood Warnings in Texas, 2009 Every flash flood warning in 2009

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.