000
FXUS66 KMTR 181750
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
1050 AM PDT TUE JUN 18 2013

.DISCUSSION...AS OF 08:35 AM PDT TUESDAY...THE UPPER TROUGH THAT
IS CURRENTLY MOVING ACROSS NORTHERN CALIFORNIA HAS MANAGED TO MIX
OUT THE MARINE LAYER SOMEWHAT THIS MORNING. THERE ARE FEWER LOW
CLOUDS ACROSS THE CWA...THUS HAVE DONE A FORECAST UPDATE TO REMOVE
DRIZZLE AND TRIM BACK FOG FOR THIS MORNING. THE UPPER TROUGH WILL
KEEP HIGH TEMPERATURES COOL...HOWEVER...AND WESTERLY WINDS ARE
EXPECTED TO BE ON THE BREEZY SIDE AGAIN THIS AFTERNOON...ESPECIALLY
NEAR THE COAST AND IN THE HILLS.

WEAK HIGH PRESSURE ALOFT IS FORECAST TO BUILD IN ALONG THE COAST
BEGINNING TOMORROW WITH A WARMING TREND THROUGH THE WEEKEND. HIGHS
BY SATURDAY ARE EXPECTED TO BE 5-10 DEGREES WARMER THAN THOSE
TODAY WITH 60S AND LOWER 70S NEAR THE COAST...AND 70S AND 80S
INLAND. WARMEST INLAND AREAS SHOULD BE AROUND 90 BY THEN. AFTER
THE BEGINNING OF NEXT WEEK...AN UPPER TROUGH IS PROGGED TO
APPROACH THE COAST ONCE AGAIN FOR SLIGHT COOLING.

&&

.AVIATION...AS OF 10:45 AM PDT TUESDAY...VFR ACROSS THE AREA THIS
MORNING WITH A TROUGH DIGGING SOUTH MIXING OUT THE MARINE LAYER.
ONSHORE SFO-SAC GRADIENT ALREADY ABOVE 3 MB AND FORECAST ABOVE 5 MB
THIS AFTERNOON BRINGING MODERATE WINDS TO THE TERMINALS. STRATUS
IN SF BAY TONIGHT LIKELY TO BE PATCHY AND HAVE EARLY BURN TOMORROW
MORNING.

VICINITY OF KSFO...VFR THROUGH THIS EVENING THOUGH EDGE OF STRATUS
IS NUDGING HALFWAY ACROSS THE AIRFIELD DUE TO THE STRONG ONSHORE
FLOW. ANY CIGS THAT DEVELOP IN THE NEXT HOUR OR SO WILL BE SHORT
LIVED. STRONG ONSHORE GRADIENT WILL BRING WEST WIND UP TO AROUND
25 KT WITH GUSTS TO 30-35 KT. NO AWW AT THIS TIME BUT WILL
CONTINUE TO MONITOR. STRATUS TO RETURN AROUND 05Z THOUGH LOCAL WRF
SUGGESTS IT WILL BE PATCHY.

KSFO BRIDGE APPROACH...FEW TO SCT AROUND 015 POSSIBLE IN THE NEXT
HOUR OR TWO AS ONSHORE FLOW PUSHES CLOUDS THROUGH THE SAN BRUNO GAP.
OTHERWISE SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...VFR THIS MORNING WITH REMAINING
PATCHES OF CLOUDS QUICKLY ERODING. GUSTY WEST WINDS THIS
AFTERNOON. STRATUS TO RETURN THIS EVENING.

&&

.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: SIMS
AVIATION/MARINE: AC

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