Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA

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FXUS66 KMTR 021155
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
455 AM PDT TUE SEP 2 2014

.SYNOPSIS...THE AREA WILL SEE A COOLING TREND BEGINNING
TODAY AS A LOW PRESSURE TROUGH APPROACHES THE COAST. DRY
CONDITIONS WILL PERSIST THROUGH THE PERIOD.

&&

.DISCUSSION...AS OF 2:13 AM PDT TUESDAY...WITH A MARINE LAYER
DEPTH OF AROUND 1200 FEET...THE SATELLITE IR FOG PRODUCT IMAGERY
IS SHOWING COASTAL STRATUS EXTENDING FROM POINT REYES SOUTH...AND
PUSHING INTO THE SALINAS VALLEY. EXPECT COOLER TEMPERATURES TODAY
ACROSS THE DISTRICT AS AN UPPER LEVEL TROUGH APPROACHES THE COAST.
THIS TROUGH IS PROGGED TO REMAIN OVER THE EASTERN PACIFIC
RESULTING IN CONTINUED COOLING THROUGH ABOUT MID TO LATE IN THE
WEEK. NIGHT AND MORNING COASTAL LOW CLOUDS ARE EXPECTED AS WELL AS
POSSIBLE DRIZZLE RIGHT AT THE IMMEDIATE COAST DURING THE EARLY
MORNING HOURS. HIGH TEMPERATURES ARE EXPECTED TO REMAIN AROUND OR
SLIGHTLY BELOW NORMAL THROUGH THE LATTER PART OF THE WEEK AND INTO
NEXT WEEKEND AS ONSHORE FLOW PERSISTS.

&&

.AVIATION...AS OF 4:30 AM PDT TUESDAY...THE N-S GRADIENT HAS
WEAKENED. STRATUS IS INCREASING ALONG THE COAST AND IS STARTING
TO SPREAD INTO THE NORTH BAY AND THE GOLDEN GATE. CIGS WILL SPREAD
OVER THE EAST BAY THIS MORNING. BELIEVE CIGS WILL STOP SHORT OF
GETTING INTO SFO BUT A PATCH OF STRATUS MAY GET INTO PART OF THE
APPROACH.

VICINITY OF KSFO...VFR WITH CIGS STAYING SOUTH AND EAST OF THE AIRPORT.
HOWEVER WITH THE CIGS SPREADING IN THE EAST BAY WE CANNOT RULE OUT
STRATUS BRIEFLY GETTING IN FROM 13Z-16Z.

KSFO BRIDGE APPROACH...PATCHY STRATUS MAY AFFECT THE APPROACH
THROUGH 16Z.

MONTEREY BAY AREA TERMINALS...IFR CIGS THROUGH 18Z.

&&

.MARINE...AS OF 5:00 AM PDT TUESDAY...HIGH PRESSURE CONTINUES OFF
THE PACIFIC NORTHWEST COAST. A THERMAL TROUGH WILL SHIFT TO THE
COAST RESULTING IN DECREASING WINDS OVER THE AREA EXCEPT FOR THE
OUTER WATERS NORTH OF POINT REYES.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TDAY...SCA...PT ARENA TO PT REYES 10-60 NM
             SCA...PT REYES TO PIGEON PT 10-60 NM
             SCA...PIGEON PT TO PT PINOS 10-60 NM
             SCA...SF BAY NORTH OF THE BAY BRIDGE FROM 1 PM

&&

$$

PUBLIC FORECAST: SIMS
AVIATION: W PI
MARINE: W PI

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