Alert archive / Texas / Flash Flood Warnings in 2003

Flash Flood Warning 21, NWS Austin/San Antonio, TX

May 12, 2003Williamson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 12, 2003, 1:16 PM CDT for Williamson County, Texas. It was in force for 119 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: May 12, 2003, 1:16 PM CDT (18:16 UTC)
Expired: May 12, 2003, 3:15 PM CDT
In force: 119 min
Issued by: NWS Austin/San Antonio, TX
Area: Counties, with a storm outline in the text

County Williamson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 6.3 hours before the alert went out and 245 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: 2521 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 247 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 121817
FFWSAT
TXC491-122015-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
116 PM CDT MON MAY 12 2003

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES...
  WILLIAMSON

* UNTIL 315 PM CDT

* AT 116 PM...WEATHER SERVICE DOPPLER RADAR INDICATED AREAS OF
  SHOWERS AND THUNDERSTORMS...WITH HEAVY RAIN...OVER PARTS OF
  WILLIAMSON COUNTY.  

SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER WILLIAMSON COUTNY
FOR THE NEXT HOUR...PRODUCING LOCALLY HEAVY RAIN.  THIS WILL
CAUSE FLOODING AT LOW WATER CROSSINGS AND OTHER LOW LYING AREAS.

LAT...LON 3064 9787 3048 9741 3064 9729 3083 9776

$$

1 follow-up statement

000 
WGUS74 KEWX 122016
FFSSAT
TXC491-122035-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
316 PM CDT MON MAY 12 2003

...THE FLASH FLOOD WARNING FOR WILLIAMSON COUNTY EXPIRED AT 315 PM 
CDT...

THE FLASH FLOOD WARNING FOR WILLIAMSON COUNTY ISSUED EARLIER
EXPIRED AT 315 PM CDT.

AT 316 PM...WIDELY SCATTERED SHOWERS REMAINED OVER PARTS OF
WILLIAMSON COUNTY.  THE HEAVY RAINS FROM SHOWERS AND THUNDERSTORMS
THAT PROMPTED THE WARNING HAVE MOVEED EAST. 

SOME MINOR FLOODING FROM RUNOFF MAY CONTINUE...HOWEVER...THE THREAT 
OF ADDITIONAL HEAVY RAIN HAS WEAKENED.  AS A RESULT...THE FLASH 
FLOOD WARNING WAS ALLOWED TO EXPIRE AT 315 PM CDT.

STAY TUNED TO LOCAL MEDIA OUTLETS FOR THE LATEST WEATHER INFORMATION.

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 10:47 AM CDT	Severe Thunderstorm Warning	EWX	Williamson	58 min
May 12, 11:52 AM CDT	Severe Thunderstorm Warning	EWX	Williamson	38 min
May 12, 1:03 PM CDT	Severe Thunderstorm Warning	EWX	Lee	27 min
May 12, 1:20 PM CDT	Severe Thunderstorm Warning	EWX	Fayette	25 min

Nearby

Flash Flood Warnings in Texas, 2003 Every flash flood warning in 2003

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.