An upper level low pressure system moving over northern Mexico will cross Texas Friday. As it moves closer, our rain chances pick up. Scattered showers and thunderstorms, some with heavy rain, will develop Thursday afternoon in Central Texas.

Here’s more from the National Weather Service:

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
717 AM CDT WED MAY 9 2012

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-
INCLUDING THE CITIES OF...LLANO...BURNET...GEORGETOWN...DEL RIO...
ROCKSPRINGS...LEAKEY...KERRVILLE...BANDERA...FREDERICKSBURG...
BOERNE...BLANCO...SAN MARCOS...AUSTIN...BASTROP...GIDDINGS...
BRACKETTVILLE...UVALDE...HONDO...SAN ANTONIO...NEW BRAUNFELS...
SEGUIN...LOCKHART...LA GRANGE...EAGLE PASS...CRYSTAL CITY...
PEARSALL...PLEASANTON...FLORESVILLE...KARNES CITY...GONZALES...
CUERO...HALLETTSVILLE...CARRIZO SPRINGS
717 AM CDT WED MAY 9 2012

...HEAVY RAINFALL EVENT TO UNFOLD EARLY THURSDAY MORNING THROUGH
LATE FRIDAY MORNING...
...STRONG TO SEVERE THUNDERSTORMS POSSIBLE OVER PARTS OF SOUTH
CENTRAL TEXAS THURSDAY NIGHT...

AN UPPER LEVEL LOW WILL INTERACT WITH A WEAK FRONTAL INVERSION
OVER TEXAS AND CREATE A POTENTIAL FOR LOCALLY HEAVY RAINFALL
LATE TONIGHT THROUGH FRIDAY MORNING. SCATTERED LIGHT RAIN SHOWERS
TODAY AND THIS EVENING WILL INCREASE TO BECOME NUMEROUS ACROSS
WESTERN PARTS OF SOUTH CENTRAL TEXAS BY EARLY THURSDAY MORNING.
WIDESPREAD MODERATE TO HEAVY RAINS ARE EXPECTED TO DEVELOP DURING
THE DAY THURSDAY AND CONTINUE THROUGH LATE FRIDAY MORNING.

WIDESPREAD RAINFALL TOTALS OF 1 TO 2 INCHES ARE EXPECTED ACROSS
SOUTH CENTRAL TEXAS BY NOON FRIDAY. LOCALLY HIGHER RAINFALL TOTALS
UP TO 4 INCHES ARE POSSIBLE...ESPECIALLY SOUTH OF A DEL RIO TO
KERRVILLE TO LEXINGTON LINE. THESE HEAVY RAINS COULD RESULT IN
LOCALLIZED FLOODING...WITH RUN-OFF PROBLEMS MOST LIKELY TO OCCUR
AFTER MIDNIGHT THURSDAY NIGHT.

IN ADDITION TO THE HEAVY RAINFALL THREAT...THERE IS A SLIGHT RISK
OF SEVERE WEATHER SOUTH OF A DEL RIO TO LAKE MEDINA TO KENEDY LINE
THURSDAY AFTERNOON AND THURSDAY EVENING. LARGE HAIL...DAMAGING
WINDS...AND ISOLATED TORNADOES WILL BE POSSIBLE.

SPC Day 2 Outlook

RESIDENTS AND TRAVELERS SHOULD MONITOR THE LATEST FORECASTS AND
BE PREPARED TO TAKE PRECAUTIONS IF A WATCH OR WARNING IS ISSUED
FOR YOUR AREA.