Alert archive / Texas / Flash Flood Watches in 2015

Flash Flood Watch 12, NWS Austin/San Antonio, TX

May 27, 201510 counties in Texas

NWS Austin/San Antonio, TX issued this flash flood watch at May 27, 2015, 12:52 PM CDT for 10 counties in Texas. It took effect at May 27, 2015, 7:00 PM CDT. It was in force for 117 min.

The area

The counties it named.

The facts

Issued: May 27, 2015, 12:52 PM CDT (17:52 UTC)
In effect from: May 27, 2015, 7:00 PM CDT
Expired: May 27, 2015, 8:57 PM CDT
In force: 117 min
Issued by: NWS Austin/San Antonio, TX
Flood severity: None

Counties Bastrop County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Gillespie County, TX, Hays County, TX, Lee County, TX, Llano County, TX, Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 69 km from the middle of the area, began a volume at 17:52 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, 5.9 hours before the alert went out and 284 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1744 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at May 27, 12:30 PM CDT, 22 minutes earlier.

Area forecast discussion, May 27, 12:30 PM CDT, 22 minutes before

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Hazardous weather outlook, May 27, 12:23 PM CDT, 29 minutes before

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In the hours before

Local storm report, May 27, 10:41 AM CDT, 2 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1041 AM CDT WED MAY 27 2015

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

1039 AM     HAIL             3 NW TANGLEWOOD FOREST  30.20N  97.88W
05/27/2015  E1.00 INCH       TRAVIS             TX   PUBLIC

            QUARTER SIZED HAIL REPORTED AT THE INTERSECTION OF
            SLAUGHTER LN AND ESCARPMENT BLVD.

&&

EVENT NUMBER EWX1500576

Local storm report, May 27, 11:43 AM CDT, 1 hour 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1143 AM CDT WED MAY 27 2015

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

1138 AM     FLASH FLOOD      3 W SUNSET VALLEY       30.23N  97.87W
05/27/2015                   TRAVIS             TX   CITY OFFICIAL

            JOE TANNER LN AND OLD BEE CAVES RD LOW WATER CROSSINGS
            HAVE BEEN CLOSED DUE TO FLOODING.

&&

EVENT NUMBER EWX1500577

Local storm report, May 27, 11:51 AM CDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1151 AM CDT WED MAY 27 2015

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

1146 AM     TORNADO          2 W TWIN SISTERS        30.00N  98.43W
05/27/2015                   BLANCO             TX   EMERGENCY MNGR

            TORNADO REPORTED JUST EAST OF HWY 281 NEAR THE LITTLE
            BLANCO RIVER.

&&

EVENT NUMBER EWX1500578

Local storm report, May 27, 12:05 PM CDT, 47 minutes before

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Special weather statement, May 27, 12:48 PM CDT, 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 5:32 AM CDT	Flash Flood Warning	EWX	Fayette, Lee	118 min
May 27, 10:12 AM CDT	Areal Flood Advisory	EWX	Hays, Travis	2 hr
May 27, 10:30 AM CDT	Severe Thunderstorm Warning	EWX	Travis	45 min
May 27, 11:01 AM CDT	Flash Flood Warning	EWX	Hays, Travis	2 hr
May 27, 11:15 AM CDT	Severe Thunderstorm Warning	EWX	Travis	19 min
May 27, 11:19 AM CDT	Severe Thunderstorm Warning	EWX	Blanco, Comal, Hays	41 min
May 27, 11:47 AM CDT	Tornado Warning Tornado observed	EWX	Blanco	27 min
May 27, 12:00 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Hays	20 min
May 27, 12:09 PM CDT	Flash Flood Warning	EWX	Blanco, Comal, Hays	3 hr
May 27, 12:48 PM CDT	Special Weather Statement	EWX	Gillespie	27 min
May 27, 1:38 PM CDT	Special Weather Statement	EWX	Llano	52 min

Nearby

Flash Flood Watches in Texas, 2015 Every flash flood watch 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.