FXUS64 KHGX 090333
AFDHGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
933 PM CST TUE DEC 8 2009

.UPDATE...
DUE TO IMPROVING INLAND VISIBILITIES SOUTH OF AN EASTERN TEXAS
WARM FRONT...OR VISIBILITIES NOT FALLING TO NOR MAINTAINING
1/4SM...HAVE DROPPED THE COASTAL COUNTY DENSE FOG ADVISORY. HAVE
MAINTAINED THE MARINE FOG ADVISORY OVER LOCAL BAYS AND NEAR SHORE
GULF WATERS...DENSE SEA FOG PERIODICALLY LOWERING VISBIES TO A
MILE OR LESS. AS THE CENTRAL TEXAS PRE-FRONTAL TROF (ROUGHLY
LOCATED BETWEEN WACO AND COLLEGE STATION AT 03Z) ENTERS OUR CWA
WITHIN THE NEXT COUPLE OF HOURS...EXPECT WINDS TO VEER OFF THEIR
CURRENT SW HEADING AND BECOME MORE W-TO-N THROUGH THE (PRE)DAWN
HOURS. DRY COLD FROPA TIMED TO PASS OFF THE COAST AROUND 09/13-15Z.
TWEAKED TEMP/MOISTURE GRIDS TO REFLECT THIS TIMING...1020-ISH MB
LEEWARD CO ROCKY HIGH SETTLING DOWN OVER TX TOMORROW. THIS CREATING
A TIGHT ENOUGH GRADIENT TO PRODUCE ANOTHER BREEZY AFTERNOON AS
THOSE 10-15G25KT NORTHERLIES MIX DOWN. 31

&&

.PREV DISCUSSION... /ISSUED 559 PM CST TUE DEC 8 2009/ 

AVIATION...
TWO CEILING AND VISIBILITY REGIMES OVER THE FORECAST AREA...WITH
NORTHERN SITES...CXO...UTS...CLL...EXPERIENCING MVFR VISIBILITIES 
BUT LIFR CEILINGS GENERALLY AROUND 300 FEET...WHILE
IAH...HOU...SGR HAVE VFR VSBYS AND MVFR CEILINGS. BOUNDARY
SEPARATING THESE AREAS...WITH THE LIFR CIGS NOT FAR FROM IAH...AS
CLOSE AS DWH. ON TOP OF THAT...GLS FLIRTING WITH SEA FOG WHICH IS
IMPACTING AREAS RIGHT ALONG THE GULF OF MEXICO.

IN THE TAFS...FORECAST WORSENING CONDITIONS AT IAH AS THINK THAT
BOUNDARY SHOULD SAG SOUTHWARD AS WINDS GRADUALLY VEER FROM SW TO
WSW..AND SMALL SHIFTS WOULD MEAN BIG DIFFERENCES IN CEILINGS. DID THE SAME
AT SGR AND HOU BUT HELD OFF WORSENING CONDITIONS FOR A FEW OURS.
AT GLS THINK SEA FOG WILL EXPAND OVER THE AIRPORT...WITH
POTENTIALLY DENSE CONDITIONS. CLL AND HTS SHOULD SEE CONDITIONS
IMPROVE OVERNIGHT WITH PASSAGE OF COLD FRONT AND WITH COOLER DRIER
AIR FILTERING IN FROM THE NW. 46

&&

.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL)      42  49  32  53  43 /  10   0   0   0  20 
HOUSTON (IAH)              53  55  35  55  45 /  10   0   0   0  30 
GALVESTON (GLS)            61  62  44  56  52 /  10   0   0   0  30 

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...DENSE FOG ADVISORY UNTIL MIDNIGHT CST TONIGHT FOR THE FOLLOWING 
     ZONES: GALVESTON BAY...MATAGORDA BAY...WATERS FROM FREEPORT 
     TO THE MATAGORDA SHIP CHANNEL OUT 20 NM...WATERS FROM HIGH 
     ISLAND TO FREEPORT OUT 20 NM.

&&

$$

DISCUSSION...31/46