Severe Thunderstorm Warning 18, NWS Corpus Christi, TX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
311 PM CDT TUE APR 25 2006

.SHORT TERM (TONIGHT THROUGH WEDNESDAY)...COLD FRONT STILL
PROGRESSING NICELY THRU S-CNTL TX...LOCATED ROUGHLY ALONG A LINE FM
DRT-SAT-CLL. AIRMASS CONTINUES TO DE-STABILIZE ACROSS S TX AHEAD OF
THE FRONT...ESPECIALLY ACROSS THE INTERIOR COASTAL BEND AND RIO
GRANDE PLAINS. CAP HAS ALMOST ERODED AND DO EXPECT ISOLD TO SCT
CONVECTION TO BEGIN FORMING ACROSS THE VICTORIA CROSSROADS AND RIO
GRANDE PLAINS THRU THE REMAINDER OF THE AFTN...WHERE FORCING FM
APPROACHING FNT AND SEA-BREEZE IS GREATEST. IMPRESSIVE CAPE AND
MODEST WRLY H5 FLOW MAY SUPPORT A FEW SEVERE SUPERCELLS. STORMS
LIKELY TO INCREASE IN COVERAGE DURING THE LATE AFTN AND EARLY EVE
HOURS...POSSIBLY MOVING THE COASTAL BEND DESPITE SEA-BREEZE POSSIBLY
STABILIZING THE COASTAL COUNTIES. WILL GO WITH 40-60 POPS AND CONT
MENTION OF SEVERE. SVR TSTM WATCH 249 HAS BEEN ISSUED FOR ENTIRE CWA
THRU 03Z.

ANTICIPATE ACTIVITY SHOULD WANE DURING THE LATE EVENING AND
OVERNIGHT WITH LOSS OF HEATING. WED LOOKS TO BE MOSTLY CLOUDY
BEHIND THE FRONT...WITH COOLER TEMPS (ACTUALLY SLIGHTLY BELOW
NORMALS FOR A CHANGE) HAVE LOWERED POPS ON WED TO ISOLD.

&&

.MARINE...WEAK TO MODERATE ONSHORE WILL CONT INTO THE EARLY EVENING.
COLD FRONT OVER SOUTH-CENTRAL TEXAS THIS AFTERNOON WILL CONTINUE TO
MOVE SOUTH INTO THE COASTAL BEND TONIGHT. SCATTERED SHOWERS AND
THUNDERSTORMS WILL BE POSSIBLE ALONG AND AHEAD OF THE FRONT...WITH A
FEW POSSIBLY BECOMING SEVERE. A MODERATE NORTHEAST FLOW WILL DEVELOP
OVERNIGHT AND WEDNESDAY ACROSS THE MIDDLE TEXAS COASTAL WATERS
BEHIND THE FRONT.

&&

.AVIATION...VFR CONDS WILL CONT THRU THE AFTN..XCPT FOR SOME PATCHY
MVFR CIGS ALONG THE COAST. ISOLD SCT RWS/TSTMS XPCTD TO DVLP ALONG
AND W OF A VCT-ALI-LRD LINE BTWN 21-00Z...AHEAD OF AN APPROACHING
COLD FRONT. SOME OF THE STORMS COULD BECOME SEVERE...WITH A THREAT
FOR LARGE HAIL AND DAMAGING WINDS. TSTMS WILL CONT INTO THE EARLY
EVE...POSSIBLY IMPACTING THE COASTAL BEND. XPCT ACTIVITY TO DIMINISH
AFTR 05Z WITH LOSS OF DAYTIME HEATING. MVFR CIGS WILL DVLP

&&

.LONG-TERM (WEDNESDAY NIGHT THROUGH TUESDAY)...LONG RANGE CONCERNS
ARE THE PRECIPITATION DURING THE PERIOD AND WHEN THE RAIN CHANCES
WILL END. MODELS BRING BEST MOISTURE TO THE SOUTH OF AREA WEDNESDAY
EVENING THEN MOVE MOISTURE ALONG RIO GRANDE OVERNIGHT THURSDAY AND
CONTINUE IT DURING THE DAY. SOME WEAK ISENTROPIC LIFT THURSDAY
MORNING AND INSTABILITY THURSDAY AFTERNOON/EVENING COULD GENERATE
SOME CONVECTION OUT TO THE WEST. FARTHER EAST...RIDGE SHOULD HOLD
PRECIP IN BAY. UPPER LEVEL LOW APPROACHES THE PANHANDLES FRIDAY AND
SATURDAY. SOME ENERGY ON THE SOUTHERN PERIPHERY OF THIS TROUGH COULD
AFFECT AREA FRIDAY THROUGH SATURDAY NIGHT. SOME DRYING OCCURS ON
SATURDAY AFTERNOON OVER THE WEST SO BELIEVE THE BETTER CHANCE FOR
PRECIP ON SATURDAY WILL BE OVER THE NORTHEAST AREAS. HOWEVER...06Z
AND 12Z GFS RUNS HOLD ON TO THE MOISTURE LONGER AND BRING THE
BOUNDARY INTO SOUTH TEXAS SUNDAY MORNING RATHER THAN SATURDAY
AFTERNOON...AND BRINGS THE MOISTURE BACK TOWARD THE RIO GRANDE EARLY
SUNDAY MORNING. THUS...HAVE EXTENDED POPS IN FOR LATE SATURDAY NIGHT
AND SUNDAY MORNING...AND EXPECT RAIN CHANCES TO DECREASE DURING THE
DAY AND BE PRETTY MUCH GONE BY NOON.  FRONTAL BOUNDARY BEHIND THIS
SYSTEM ON SUNDAY NOT VERY STRONG SO DO NOT EXPECT A BIG TEMPERATURE
DROP...IT WILL MAINLY BE LESS HUMIDITY. MONDAY AND TUESDAY LOOK TO
BE RAIN-FREE DAYS AS WEAK RIDGE BUILDS IN AND AMPLIFIES ON TUESDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
CORPUS CHRISTI    66  78  65  82  71  /  50  20  10  10  10
VICTORIA          64  78  57  81  66  /  60  20  10  10  10
LAREDO            70  82  67  87  73  /  60  20  10  20  20
ALICE             66  80  62  85  69  /  60  20  10  10  10
ROCKPORT          67  78  64  80  71  /  50  20  10  10  10
COTULLA           64  80  60  85  67  /  60  20  10  20  20
KINGSVILLE        68  80  64  83  70  /  50  20  10  10  10

&&

.CRP WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...NONE.

&&

JR/76...SHORT-TERM
GW/86...LONG-TERM

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
335 PM CDT TUE APR 25 2006

GMZ230-235-250-255-270-275-TXZ229>234-239>247-261100-
BAYS AND WATERWAYS FROM BAFFIN BAY TO PORT ARANSAS-
BAYS AND WATERWAYS FROM PORT ARANSAS TO PORT OCONNOR-
COASTAL WATERS BAFFIN BAY TO PORT ARANSAS OUT 20 NM-
COASTAL WATERS PORT ARANSAS TO MATAGORDA SHIP CHANNEL OUT 20 NM-
WATERS BAFFIN BAY TO PORT ARANSAS 20 TO 60 NM-
WATERS PORT ARANSAS TO MATAGORDA SHIP CHANNEL 20 TO 60 NM-
LA SALLE-MCMULLEN-LIVE OAK-BEE-GOLIAD-VICTORIA-WEBB-DUVAL-
JIM WELLS-KLEBERG-NUECES-SAN PATRICIO-ARANSAS-REFUGIO-CALHOUN-
335 PM CDT TUE APR 25 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH TEXAS AND THE MIDDLE
TEXAS COASTAL WATERS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO
DEVELOP LATE THIS AFTERNOON ACROSS THE RIO GRANDE PLAINS AHEAD OF
AN APPROACHING COLD FRONT...THEN BECOME MORE NUMEROUS AND MOVE
INTO THE VICTORIA CROSSROADS AND COASTAL BEND THIS EVENING. SOME
OF THESE STORMS COULD BECOME SEVERE ACROSS SOUTH TEXAS...PRODUCING
LARGE HAIL AND DAMAGING WINDS. A SEVERE THUNDERSTORM WATCH HAS
BEEN ISSUED THROUGH 10 PM TONIGHT FOR ALL OF SOUTH TEXAS AND THE
ADJACENT NEARSHORE GULF WATERS.

THE THUNDERSTORMS WILL DIMINISH TOWARDS AND AFTER MIDNIGHT WITH
THE LOSS OF DAYTIME HEATING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SCATTERED THUNDERSTORMS WILL BE POSSIBLE FRIDAY NIGHT AND SATURDAY
IN ADVANCE OF A STRONG UPPER LEVEL DISTURBANCE.  SOME OF THESE
STORMS WILL HAVE THE POTENTIAL OF BECOMING STRONG TO SEVERE MAINLY
ACROSS THE RIO GRANDE PLAINS AND NORTHERN COASTAL BEND.

SMALL CRAFT ADVISORY CONDITIONS WILL OCCUR FRIDAY AND SATURDAY
ACROSS MOST OF THE COASTAL WATERS DUE TO A STRENGTHENING PRESSURE
GRADIENT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS REQUESTED FOR THIS AFTERNOON AND EVENING.

JR/GW

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
541 PM CDT TUE APR 25 2006

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

0530 PM     HAIL             FREER                   27.88N 98.62W
04/25/2006  M1.00 INCH       DUVAL              TX   LAW ENFORCEMENT

            FREER P.D. REPORTED HAIL COVERING THE GROUND.

&&

RUNYEN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
546 PM CDT TUE APR 25 2006

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

0545 PM     HAIL             7 W SAN DIEGO           27.76N 98.35W
04/25/2006  M0.88 INCH       DUVAL              TX   TRAINED SPOTTER

&&

RUNYEN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
631 PM CDT TUE APR 25 2006

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

0625 PM     HAIL             LAREDO                  27.53N 99.49W
04/25/2006  M1.00 INCH       WEBB               TX   FIRE DEPT/RESCUE

            NICKLE TO QUARTER SIZE HAIL ON SOUTH SIDE OF LAREDO

&&

RUNYEN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
642 PM CDT TUE APR 25 2006

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

0641 PM     HAIL             7 S TILDEN              28.35N 98.54W
04/25/2006  M1.00 INCH       MCMULLEN           TX   LAW ENFORCEMENT

            NICKLE TO QUARTER SIZE HAIL REPORTED ON HIGHWAY 16 SOUTH
            OF FREER.

&&

RUNYEN