000
FXUS66 KMTR 181048
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
348 AM PDT TUE JUN 18 2013

.DISCUSSION...AS OF 03:45 AM PDT TUESDAY...500MB LOW PRESSURE
SYSTEM IS APPROXIMATELY 300 MILES OFF OF THE WA/OR COAST THIS
MORNING. AHEAD OF THE APPROACHING SYSTEM AND ASSOCIATED
THROUGH...850MB TEMPERATURES CONTINUE TO COOL PER RAP40 ANALYSIS.
AT THE SURFACE...A DECENT MARINE LAYER IN PLACE AND HAS ALLOWED
FOR LOW STRATUS TO SPREAD INTO THE SAN FRANCISCO AND MONTEREY BAY
AREAS AND HAS EVEN PUSHED INTO THE VALLEYS.

EXPECTING LOW CLOUDS TO BURN-OFF BY THIS AFTERNOON WITH SLIGHTLY
COOLER CONDITIONS TODAY FROM WHAT OCCURRED ON MONDAY DUE TO COOLER
850MB TEMPERATURES ALOFT. AS THE UPPER LEVEL TROUGH AXIS MOVES
INLAND...TEMPERATURES WILL SLIGHTLY WARM ON WEDNESDAY AND MORE-SO
LATE IN THE WEEK INTO THE WEEKEND AS RIDGING BUILDS IN BEHIND THE
EXITING THROUGH.

LOOKING INTO EARLY NEXT WEEK...MODELS SUGGEST AN ONSHORE FLOW IN
THE LOWER LEVELS WILL RETURN. THIS WILL BRING NEAR AVERAGE
CONDITIONS BACK TO THE CENTRAL COAST.

&&

.AVIATION...AS OF 10:56 PM PDT MONDAY...STRATUS IS GRADUALLY
MOVING IN UNDER A 1500 FOOT MARINE LAYER. STRATUS IS EXPECTED
TO RETURN OVER MOST AREA TERMINALS TONIGHT WITH CLEARING
ANTICIPATED BETWEEN 16Z-18Z TUESDAY MORNING. GUSTY WINDS WILL
GRADUALLY DIMINISH AS THE NIGHT PROGRESSES.

VICINITY OF KSFO...MVFR EXPECTED THROUGH TONIGHT WITH CLEARING
EXPECTED BETWEEN 17Z-18Z TUESDAY MORNING. GUSTY WINDS WILL
GRADUALLY DIMINISH OVERNIGHT.

KSFO BRIDGE APPROACH...1000 FOOT CIGS HAVE FILL INTO THE
BAY THIS EVENING AND ARE EXPECTED TO CONTINUE TO AFFECT THE
APPROACH UNTIL AROUND 15Z. WINDS WILL GRADUALLY DIMINISH
OVERNIGHT.

MONTEREY BAY AREA TERMINALS...IFR/MVFR WILL CONTINUE THROUGH
TONIGHT WITH CLEARING AROUND 16Z OVER KSNS AND 18Z OVER KMRY.
LIGHT WINDS WILL INCREASE IN THE AFTERNOON.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TDAY...SCA...SF BAY FROM NOON
             SCA...MRY BAY FROM NOON
             SCA...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM
             SCA...PIGEON PT TO PT PIEDRAS BLANCAS 10-60 NM

&&

$$

PUBLIC FORECAST: RGASS
AVIATION/MARINE: CANEPA

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