Area Forecast Discussion
Issued by NWS Houston/Galveston, TX

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000
FXUS64 KHGX 022334
AFDHGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
634 PM CDT TUE SEP 2 2014

.DISCUSSION...
SEE AVIATION FOR 0Z TAF ISSUANCE.

&&

.AVIATION...
MOSTLY VFR CONDITIONS EXPECTED FOR THE TAF SITES THROUGH THE
ISSUANCE. MIGHT GET SOME LOW CLOUD DEVELOPMENT TOMORROW MORNING
BUT THEY SHOULD QUICKLY LIFT AFTER THE SUN RISES. FORECAST
SOUNDINGS FOR TOMORROW SHOW LOWER MOISTURE VALUES WITH PRETTY GOOD
INSTABILITY IN THE SOUNDINGS. AN UPPER LEVEL RIDGE WILL BE
BUILDING A BIT TOMORROW AFTERNOON THOUGH SO THINK SLIGHTLY LESS
COVERAGE TOMORROW THAN TODAY. 23

&&

.PREV DISCUSSION... /ISSUED 415 PM CDT TUE SEP 2 2014/

DISCUSSION...
SCATTERED SHRA/TSRA WILL CONTINUE OVER MAINLY THE NORTHERN HALF OF
SE TX THROUGH EARLY EVENING. STORMS WILL BEGIN TO DIMINISH WITH
THE LOSS OF HEATING. TS DOLLY WILL MAKE LANDFALL OVER NORTHERN
MEXICO SOMETIME THIS EVENING AND ONLY BRING LONG PERIOD SWELLS TO
THE OFFSHORE MARINE ZONES AND SLIGHTLY ELEVATED TIDES. A FLATTISH
500 MB RIDGE SLOWLY BUILDS INTO SE TX FROM THE EAST LATER THIS
WEEK AND PW VALUES REMAIN BETWEEN 1.8 AND 1.9 INCHES THROUGH
FRIDAY. DESPITE THE BUILDING RIDGE...500 HEIGHTS NEVER REALLY
INCREASE MUCH WITH VALUES AROUND 590 DM. CONVECTIVE TEMPS ALSO
REMAIN BETWEEN 88 AND 90 DEGREES WHICH IS REACHABLE. THERE REALLY
ISN`T A TRIGGER FOR WIDESPREAD RAINFALL BUT YOU CAN`T RULE OUT AN
OCCASIONAL SHRA EITHER SO WILL MAINTAIN 20 POPS THROUGH THE
FRIDAY. ON SUNDAY...PW VALUES INCREASE TO 2.1 INCHES AND BOTH THE
ECMWF AND GFS BRING A WEAK BOUNDARY INTO SE TX. LL CONVERGENCE
ALONG THE BOUNDARY INCREASES SUNDAY AFTERNOON AND COUPLED WITH THE
HIGH MOISTURE CONTENT...FEEL RAIN CHANCES WILL BE ON THE RISE.
RAISED POPS TO CHANCE FOR SUNDAY. THE UPPER PATTERN DOESN`T LOOK
CONDUCIVE FOR A FRONT TO MAKE IT INTO SE TX BUT BOTH MODELS HAVE
BEEN HINTING AT THE FRONT ENTERING SE TX FOR THE LAST FEW DAYS. A
DEEP UPPER TROUGH WILL MOVE INTO THE INTERMOUNTAIN WEST EARLY NEXT
WEEK. THE RIDGE OVER TEXAS WILL AMPLIFY IN RESPONSE TO THIS AND
RAIN CHANCES WILL DIMINISH AND TEMPS WILL WARM A BIT.  43

MARINE...
BASED ON SATELLITE...SHORT-LIVED TROPICAL STORM DOLLY APPEARS TO BE
COMING ONSHORE THIS AFTERNOON. THE EFFECTS OF DOLLY...IF ANY...WILL
ALSO BE SHORT-LIVED AND IN THE FORM OF A HIGHER PERIOD SWELL ACROSS
THE FAR OFFSHORE WESTERN WATERS. A BRIEF TIME FRAME BETWEEN TONIGHT
AND INTO EARLY WEDNESDAY MORNING OF GREATER THAN 6 FOOT SEAS...A
SHORT FUSE SCA WILL BE ISSUED THIS AFTERNOON TO COMMUNICATE THIS
ELEVATED SEA THREAT. THERE IS A CHANCE FOR SOME MINOR WATER RUN-UP ALONG
HIGHWAY 87 DURING THE OVERNIGHT HOURS. OVERALL SOUTHEASTERLIES WILL
REMAIN AT...OR SLIGHTLY UNDER...20 KNOTS THROUGH TOMORROW AFTERNOON...
WEAKENING BACK TO SUB-CAUTION CONDITIONS BY SUNSET WEDNESDAY. WEAK
DISTURBANCES ROTATING UNDERNEATH SOUTHERN U.S. RIDGING WILL OCCASIONALLY
MAKE IT INTO THE UPPER TEXAS COASTAL WATERS. THIS WILL PROVIDE THE TRIGGER
FOR RETURN WIDELY SCATTERED RAIN AND ISOLATED THUNDERSTORMS OVER THE NEXT
SEVERAL DAYS. 31

&&

.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL)      75  95  75  95  76 /  30  20  10  20  10
HOUSTON (IAH)              77  93  77  93  77 /  20  30  10  20  10
GALVESTON (GLS)            81  91  82  91  82 /  20  30  20  20  10

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL 4 AM CDT WEDNESDAY FOR
     THE FOLLOWING ZONES: MATAGORDA BAY...WATERS FROM FREEPORT
     TO THE MATAGORDA SHIP CHANNEL OUT 20 NM...WATERS FROM HIGH
     ISLAND TO FREEPORT 20 TO 60 NM...WATERS FROM HIGH ISLAND TO
     FREEPORT OUT 20 NM.

     SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL 10 PM CDT THIS EVENING
     FOR THE FOLLOWING ZONES: WATERS FROM FREEPORT TO THE
     MATAGORDA SHIP CHANNEL 20 NM TO 60 NM.

     SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS FROM 10 PM THIS EVENING
     TO 10 AM CDT WEDNESDAY FOR THE FOLLOWING ZONES: WATERS FROM
     FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM.

&&

$$

AVIATION/MARINE...23



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