Alert archive / Texas / Areal Flood Advisories in 2012

Areal Flood Advisory 39, NWS Austin/San Antonio, TX

May 6, 2012Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at May 6, 2012, 12:55 AM CDT for Travis County, Williamson County, Texas. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: May 6, 2012, 12:55 AM CDT (05:55 UTC)
Expired: May 6, 2012, 3:00 AM CDT
In force: 2 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 39 km from the middle of the area, began a volume at 05:54 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 00:00Z, 5.9 hours before the alert went out and 263 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: 3437 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 1465 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 areal flood advisory went out at May 6, 12:26 AM CDT, 29 minutes earlier.

Area forecast discussion, May 6, 12:26 AM CDT, 29 minutes before

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Hazardous weather outlook, May 5, 10:55 PM CDT, 2 hours before

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In the hours before

Special weather statement, May 5, 8:32 PM CDT, 4 hours 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
832 PM CDT SAT MAY 5 2012

TXZ171-060230-
LLANO-
832 PM CDT SAT MAY 5 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LLANO COUNTY UNTIL
930 PM CDT...

AT 825 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM NEAR FREDONIA...OR 17 MILES NORTHEAST OF MASON...
MOVING EAST AT 15 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.

THE PATH OF THIS THUNDERSTORM SHOULD AFFECT THE VALLEY SPRING AREA
BY 9 PM...AND STORMS COULD CONTINUE TO SPREAD EAST TO SOUTHEAST INTO
THE CASTELL...LLANO...AND BABY HEAD COMMUNITIES BY 930 PM.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS
DITCHES...LOW WATER CROSSINGS AND UNDERPASSES. DO NOT DRIVE YOUR
VEHICLE ACROSS FLOODED ROADWAYS.

Special weather statement, May 5, 9:13 PM CDT, 3 hours 42 minutes before

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Special weather statement, May 5, 9:38 PM CDT, 3 hours 17 minutes before

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Special weather statement, May 5, 10:49 PM CDT, 2 hours 6 minutes before

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Special weather statement, May 6, 12:49 AM CDT, 6 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 5, 8:33 PM CDT	River Flood Warning	EWX	Val Verde	19 days
May 6, 3:26 AM CDT	Severe Thunderstorm Warning	EWX	Bexar, Comal	34 min
May 6, 4:11 AM CDT	Areal Flood Advisory	EWX	Bexar	3 hr
May 6, 6:12 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	63 min
May 6, 6:54 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	51 min

Nearby

Areal Flood Advisories in Texas, 2012 Every areal flood advisory in 2012

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.