FNUS74 KHGX 191255
FWSHGX

SPOT FORECAST FOR SAMHOUSTON C-96...USFOREST SERVICE
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
655 AM CST THU JAN 19 2012

IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
ONSHORE WINDS WILL BRING AN INCREASE IN LOW LEVEL MOISTURE. UNSEASONABLY
WARM TEMPERATURES ARE EXPECTED TODAY AND AGAIN FRIDAY. AREAS OF SEA
FOG WILL BE POSSIBLE BEGINNING AS EARLY AS TONIGHT. THE SEA FOG COULD
PLAGUE THE AREA THROUGH SUNDAY. MIXING HEIGHTS WILL REMAIN ON THE LOW
SIDE AS A TEMPERATURE INVERSION DEVELOPS AROUND 3000 FEET.

COMMENTS:
A TEMPERATURE INVERSION SHOULD KEEP MIXING HEIGHTS BETWEEN 2000 AND 3000
FEET THIS AFTERNOON. DESPITE THE LOW MIXING HEIGHTS...TRANSPORT WINDS
BE FAIRLY ROBUST...BETWEEN 20 AND 25 KNOTS. SURFACE DEW POINTS WILL
CONTINUE TO CLIMB AND RH VALUES WILL BE RELATIVELY HIGH TODAY AND VERY
HIGH OVERNIGHT.

THE FOG THREAT TONIGHT IS MARGINAL THIS FAR INLAND. SURFACE WINDS WILL
REMAIN SOUTH TO SOUTHWEST AND THIS TRAJECTORY IS UNFAVORABLE FOR SEA
FOG TO TRAVEL INLAND. AT THIS TIME...FEEL LOW CEILINGS (LOW OVERCAST)
WILL DEVELOP INSTEAD OF FOG. THAT SAID...ALL MODEL GUIDANCE IS FAVORING
FOG. ONE MORE CAVEAT...THERE IS A GREAT DEAL OF DRY AIR ABOVE THE
INVERSION LAYER. SINCE TRANSPORT WINDS ARE ARE SO ROBUST...SOME MIXING
OF THE DRY LAYER COULD HELP ERODE THE CLOUD DECK AND PRODUCE A BIT
MORE SUNSHINE THIS AFTERNOON. IF THIS OCCURS...MIXING HEIGHTS WILL
BE HIGHER THAN FORECAST.


.TODAY...
TIME (CST)      11 AM  1 PM   3 PM   5 PM
SKY (%).........MCLDY  MCLDY  PCLDY  PCLDY
WEATHER COV.....
WEATHER TYPE....NONE   NONE   NONE   NONE
TEMP............61     69     72     68
RH..............78     66     61     73
20FT WIND DIR...S      S      S      S
20FT WIND (MPH).10     13     13     12
20FT WIND GUST..15     15     15     15

.TONIGHT...
TIME (CST)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
SKY (%).........PCLDY  PCLDY  MCLDY  MCLDY  MCLDY  MCLDY
WEATHER COV.....                     AREAS  AREAS  AREAS
WEATHER TYPE....NONE   NONE   NONE   FOG    FOG    FOG
TEMP............63     62     60     58     57     56
RH..............87     87     93     96     96     96
20FT WIND DIR...S      S      S      S      S      S
20FT WIND (MPH).10     8      7      7      7      7
20FT WIND GUST..15     10

$$
FORECASTER...ROESELER
REQUESTED BY...RANDY PREWITT
TYPE OF REQUEST...PRESCRIBED
.TAG 20120119.SAMHO.01/HGX