Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 25, NWS Austin/San Antonio, TX

July 1, 2001Williamson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 1, 2001, 9:32 AM CDT for Williamson County, Texas. It was in force for 118 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jul 1, 2001, 9:32 AM CDT (14:32 UTC)
Expired: Jul 1, 2001, 11:30 AM CDT
In force: 118 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Williamson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 2.5 hours before the alert went out and 251 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: 576 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 543 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 011436
FFWEWX
TXC491-011630-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
932 AM CDT SUN JUL 1 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WILLIAMSON

* UNTIL 1130 AM CDT

* AT 932 AM...WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS
  WITH VERY HEAVY RAIN OVER TAYLOR AND GRANGER LAKE WITH RAINFALL
  RATES APPROACHING 4 INCHES PER HOUR.  OTHER THUNDERSTORMS WITH VERY
  HEAVY RAINFALL AND RATES OF 3 INCHES PER HOUR WERE NEAR
  JARRELL...ANDICE...AND FLORENCE.

HEAVY RAINFALL WILL CONTINUE THROUGH THE NEXT TWO HOURS.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

LAT...LON 3072 9797 3065 9790 3052 9781 3053 9761
       k   3042 9743 3049 9722 3076 9730 3095 9783

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 Jul 1, 9:03 AM CDT, 29 minutes earlier.

Area forecast discussion, Jul 1, 9:03 AM CDT, 29 minutes before

SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
903 AM CDT SUN JUL 1 2001

AREA 88D'S SHOW CLUSTERS OF SHOWERS AND THUNDERSTORMS DRIFTING INTO
THE NORTHERN CWA WITH SOME DEVELOPMENT SOUTHEAST AS WELL.  RADAR
ESTIMATES INDICATE HOURLY RAINFALL RATES OF UP TO 3 INCHES.  WILL
UPDATE TO BOOST POPS AND MENTION HEAVY RAINS AT TIMES...ESPECIALLY
THIS MORNING.  OTHERWISE...NO OTHER CHANGES...ALTHOUGH WILL PRO1BABLY
HAVE TO LOWER AFTERNOON HIGHS IN ANOTHER UPDATE LATER DUE DEBRIS
CLOUDS.  04/06/JB.

.EWX...NONE.

In the hours before

Special weather statement, Jul 1, 6:40 AM CDT, 2 hours 52 minutes before

TXZ171>173-183>194-202>209-217>225-228-011700-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
640 AM CDT SUN JUL 1 2001

...WIDELY SCATTERED TO SCATTERED SHOWERS AND THUNDERSTORMS POSSIBLE
TODAY...

ANOTHER WEATHER SYSTEM TO THE NORTH WILL MOVE SOUTH TODAY...POSSIBLY
AFFECTING PARTS OF CENTRAL AND SOUTH CENTRAL TEXAS.  A MORE
UNSTABLE ENVIRONMENT IS POSSIBLE...MAKING IT EASIER FOR
WIDELY SCATTERED TO SCATTERED SHOWERS OR THUNDERSTORMS TO
FORM OVER PARTS OF CENTRAL AND SOUTH CENTRAL TEXAS TODAY.

SHOWERS AND A FEW ISOLATED THUNDERSTORMS ARE POSSIBLE OVER THE
EASTERN TEXAS HILL COUNTRY TO ADJACENT PARTS OF CENTRAL TEXAS THIS
MORNING...AND COULD CONTINUE DEVELOPING TO THE SOUTHWEST TO PARTS OF
SOUTH CENTRAL TEXAS.

WIDELY SCATTERED TO SCATTERED SHOWERS OR THUNDERSTORMS ARE THEN
POSSIBLE IN THE AFTERNOON TO EARLY EVENING FOR THE HILL COUNTRY TO
ADJACENT PARTS OF CENTRAL TEXAS...AND OVER PARTS OF SOUTH CENTRAL
TEXAS.

STRONG GUSTY WINDS...OCCASIONAL DEADLY LIGHTNING...AND BRIEF HEAVY
RAIN ARE POSSIBLE WITH THE SHOWERS AND THUNDERSTORMS.

ADDITIONAL STATEMENTS WILL BE ISSUED AS CONDITIONS WARRANT.

Nearby

Flash Flood Warnings in Texas, 2001 Every flash flood warning in 2001

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.