Area Forecast Discussion
Issued by NWS Houston/Galveston, TX

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000
FXUS64 KHGX 232118
AFDHGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
318 PM CST FRI JAN 23 2015

.DISCUSSION...
A NORTHWEST FLOW ALOFT WILL DEVELOP BEHIND THE UPPER LEVEL TROUGH
CURRENTLY MOVING ACROSS SE TEXAS THIS AFTERNOON. THE LIGHT RAIN
AREAS WILL PUSH OFF TO THE EAST LATER THIS AFTERNOON AND CLEARING
SKIES SHOULD BEGIN LATER THIS EVENING. HOWEVER...THE POSITION OF
THE SUBTROPICAL JET MAY HELP KEEP HIGH LEVEL CLOUDINESS OVERHEAD
ON SATURDAY AND SUNDAY. A SECONDARY DRY FRONT WILL PUSH THROUGH ON
SUNDAY. AFTER THIS FRONT MOVES OFF THE COAST...AN UPPER LEVEL
RIDGE WILL BUILD OVERHEAD.

THE MAIN ISSUE FOR THE NEXT TWO DAYS WILL BE OVERNIGHT
TEMPERATURES. FOR TONIGHT AND EARLY SATURDAY MORNING SOME OF THE
GUIDANCE WAS FORECASTING LOWS IN THE LOWER 30S WELL NORTH AND WEST
OF HOUSTON. BECAUSE OF THE WET GROUND...FELT THAT THOSE NUMBERS
WERE A BIT ON THE LOW SIDE AND COMPROMISED WITH THE SLIGHTLY
HIGHER GUIDANCE. HIGH CLOUDINESS SATURDAY NIGHT AND SUNDAY MAY
BECOME A FACTOR IN KEEPING TEMPERATURES A BIT WARMER. FOR BOTH
NIGHTS...THE SURFACE HIGH PRESSURE WILL STAY WELL WEST OF THE
FORECAST AREA.

TEMPERATURES STARTING ON SUNDAY WILL BEGIN TO MODERATE AS THE
UPPER LEVEL RIDGE BUILDS OVERHEAD. THIS RIDGE WILL BEGIN TO BREAK
DOWN BY THE MID WEEK PERIOD AND USHER IN A MORE WESTERLY FLOW
ALOFT OVER THE LAST HALF OF THE WORK WEEK. A SERIES OF SHORTWAVE
TROUGHS MOVING THROUGH THE FLOW WILL COMBINE WITH A MORE ONSHORE
SURFACE FLOW TO RETURN RAIN CHANCES BY FRIDAY.

40

&&

.MARINE...
WILL MAINTAIN AN ADVISORY IN THE GULF WATERS UNTIL THE EVENING
UPDATE. SUSTAINED SPEEDS NOT QUITE THERE YET BUT GUIDANCE STILL
SUGGESTS A SLIGHT BUMP UP DURING THE LATE AFTN/EVNG HOURS. BEYOND
TONIGHT...IMPROVING CONDITIONS EXPECTED WITH LIGHT WEST WINDS AND
FALLING SEAS. LOOKS LIKE A WEAK REINFORCING FRONT COULD PUSH INTO
THE WATERS SUNDAY NIGHT OR MONDAY MORNING BUT DOESN`T LOOK LIKE
ANY FLAGS WILL BE NEEDED ATTM. 47

&&

.PREV DISCUSSION... /ISSUED 1134 AM CST FRI JAN 23 2015/

AVIATION...
BASE OF UPPER TROF AND ASSOCIATED LIGHT RAIN MOVING INTO SE TX.
HIGH END IFR AND MVFR CIGS SHOULD GRADUALLY LIFT AND PRECIP END
FROM WEST TO EAST LATE IN THE AFTERNOON AS THIS SYSTEM PUSHES OFF
TO THE EAST. CLEARING SKIES & DIMINISHING WINDS DURING THE
EVENING HOURS AND OVERNIGHT & JUST SOME SCT CIRRUS ON SAT. 47

&&

.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL)      35  59  40  67  43 /  10   0   0   0   0
HOUSTON (IAH)              37  60  39  67  44 /  10   0   0   0   0
GALVESTON (GLS)            42  57  47  63  49 /  10   0   0   0   0

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL 10 PM CST THIS EVENING
     FOR THE FOLLOWING ZONES: GALVESTON BAY...MATAGORDA BAY.

     SMALL CRAFT ADVISORY UNTIL 10 PM CST THIS EVENING 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...WATERS FROM HIGH ISLAND TO
     FREEPORT OUT 20 NM.

&&

$$

DISCUSSION...40
AVIATION/MARINE...47


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