Flash Flood Warning 26, NWS Houston/Galveston, TX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
512 AM CDT TUE JUN 20 2006

.DISCUSSION...
QUITE A BIT TO LOOK OVER THIS MORNING SO RUNNING BEHIND WITH THIS
DISCUSSION. MID-LEVEL CIRCULATION LARGELY RESPONSIBLE FOR THE HVY
RAINS PROGGED TO MOVE OFF TO THE WEST/WEAKEN THESE NEXT COUPLE OF
DAYS. IN THE MEANTIME...THE THREAT OF ADDITIONAL HVY RAINS REMAIN
HIGH AS THE CORE SLOWLY SHIFTS WWD. HAVE REDRAWN/REISSUED THE FFA
TO DROP A COUPLE COUNTIES EAST...THEN PICKING UP SOME OVER THE W.
SOME HEATING LATER TODAY COULD GENERATE ISOLATED STRONG TSRA THIS
AFTN AS THE AIRMASS OVER SE TX REMAINS QUITE MOIST/UNSTABLE/UNCAP-
PED. HOWEVER...CONFIDENCE IS LOW AS CLOUDS COULD STICK AROUND AND
/OR MESO TYPE INFLUENCES PREVAIL IN THE WAKE OF THIS MORNINGS ACT-
IVITY. BEYOND TODAY WILL LIKELY KEEP LOWISH CHC POPS IN FOR WEDS/
THURS AS LINGERING MOISTURE HELPS ISOLATED PCPN DEVELOP ALONG THE
SEABREEZE. WE SHOULD SEE A BRIEF RESPITE FROM POPS BY FRI AS HIGH
PRESSURE SETTLES ALOFT. BUT THE BRIEF RESPITE COULD ALSO BE BRIEF
AS MODELS INCREASE POPS OVER THE WEEKEND IN RESPONSE TO A SEVERAL
FEATURES/CHANGES IN THE PATTERN. RIDGE PROGGED TO CONTINUE BUILD-
ING WEST AS A BROAD WEAKNESS DEVELOPS OVER THE NORTH CENTRAL GULF
COAST REGION. A SHEAR AXIS THEN FORMS NW OF THE CWFA ON SAT WHICH
SLOWLY SINKS SE TO THE COASTLINE AROUND SUN NIGHT. FROM THE OTHER
DIRECTION AN ELY WAVE IS FORECAST TO MOVE WWD ACROSS THE NRN GULF
TOWARD US. THIS GENERAL TROFFINESS COULD ALSO HELP PUSH A FRONT
INTO THE AREA THROUGH THE BACKDOOR EARLY NEXT WEEK. NOT HOLDING A
WHOLE LOT OF FAITH IN THIS PART OF THE EXTENDED GUIDANCE ATTM. 41

&&

.AVIATION...
THIS SHOULD BE THE LAST DAY OF THE CORE RAINS ASSOCIATED WITH THE
MID/UPPER LOW ASSUMING MODELS VERIFY BY TAKING IT WSW OF SE TX TODAY
& TONIGHT. BELIEVE THE PERIOD BETWEEN NOW AND NOON SHOULD BE THE
BUSIEST OF THE DAY WX-WISE. HEAVY RAIN POTENTIAL IS STILL A PRETTY
GOOD BET. AM ALSO A LITTLE CONCERNED THAT IF WE GET A FEW BREAKS OF
SUN LATE THIS AFTERNOON WE COULD GET A FEW STRONG CELLS TO POP. LOW
CONFIDENCE SO WONT INCLUDE IN THE TAFS...BUT ID WATCH ALONG & EAST
OF I-45.  ANTICIPATE A RETURN TO THE MORE TYPICAL AFTN/EVNG PRECIP
WED AND BEYOND.  47
&&

.MARINE...
OBVIOUSLY MAIN FCST ISSUE IS NUMEROUS TSTMS IN THE NEARSHORE WATERS
AND BAYS TODAY. MESO BOUNDARY NEAR AND JUST OFF THE COAST WILL LEAD
TO EASTERLY WINDS EARLY THIS MORNING THERE. ASSUMING THIS BOUNDARY
WILL GRADUALLY WASH OUT THIS AFTERNOON LEADING TO A RETURN SE WINDS.
TYPICAL SUMMER DIURNAL ONSHORE WIND PATTERN SHOULD PERSIST INTO
FRIDAY BEFORE THE GRADIENT REALLY WEAKENS THIS WEEKEND.  47
&&

.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL)      88  73  91  73  93 /  70  20  20  20  20
HOUSTON (IAH)              87  75  90  75  92 /  70  20  30  30  30
GALVESTON (GLS)            85  78  86  78  88 /  70  20  30  30  30

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...FLOOD WATCH UNTIL 4 PM TUESDAY FOR THE FOLLOWING ZONES: AUSTIN...
     BRAZORIA...CHAMBERS...COLORADO...FORT BEND...GALVESTON...
     HARRIS...JACKSON...LIBERTY...MATAGORDA...MONTGOMERY...BRAZOS...
     BURLESON...GRIMES...WASHINGTON...WALLER...AND WHARTON.

     FLOOD WATCH UNTIL 5 AM TUESDAY FOR THE FOLLOWING ZONES: POLK...
     AND SAN JACINTO.

GM...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL 5 AM TUESDAY FOR THE
     FOLLOWING ZONES: WATERS FROM FREEPORT TO THE MATAGORDA SHIP
     CHANNEL 20 NM TO 60 NM...WATERS FROM FREEPORT TO THE
     MATAGORDA SHIP CHANNEL OUT 20 NM...WATERS FROM HIGH ISLAND
     TO FREEPORT 20 TO 60 NM...AND WATERS FROM HIGH ISLAND TO
     FREEPORT OUT 20 NM.

&&

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