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[Printable]
579
FXUS66 KMTR 311003
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
303 AM PDT THU JUL 31 2014

.SYNOPSIS...A DRIER MID TO UPPER LEVEL SOUTHWEST FLOW HAS REACHED
THE AREA AND WILL PERSIST INTO THE WEEKEND. TEMPERATURES SHOULD
REMAIN VERY WARM INLAND AND COOLER ALONG THE COAST. COOLER AIR IS
EXPECTED TO SPREAD INLAND LATER IN THE WEEKEND AND EARLY NEXT WEEK
AS THE MARINE LAYER DEEPENS.

&&

.DISCUSSION...AS OF 3:03 AM PDT THURSDAY...HIGH CLOUDS FROM THE
FORMER TROPICAL SYSTEM HERNAN HAVE EXITED THE AREA AND ARE NOW
OVER NEVADA. NOW SATELLITE SHOWS COASTAL STRATUS HAS SPREAD INTO
INLAND AREAS. THE MARINE LAYER DEPTH IS ROUGHLY THE SAME AS 24
HOURS AGO...JUST OVER 1000 FEET DEEP AND THE ONSHORE SURFACE
PRESSURE GRADIENT HAS INCREASED WITH 3.0 MB BETWEEN SFO AND SAC.
CURRENT TEMPERATURES AND DEW POINTS ARE MOSTLY SIMILAR TO THOSE
FROM YESTERDAY AT THIS TIME...ALTHOUGH SOME STATIONS ARE REPORTING
READINGS THAT ARE A FEW DEGREES COOLER.

A BROAD UPPER LEVEL TROUGH OVER THE EASTERN PACIFIC WILL PROVIDE A
DRY SOUTHWEST FLOW ALOFT ACROSS THE DISTRICT THROUGH THE REMAINDER
OF THE WEEK AND INTO THE WEEKEND. ONSHORE FLOW IS EXPECTED TO
INCREASE BY LATE IN THE WEEKEND WHICH WILL ALLOW FOR COOLER AIR TO
FILTER FARTHER INLAND WITH NEAR NORMAL TEMPERATURES EXPECTED.
THERE COULD BE A SLIGHT WARM-UP ONCE AGAIN LATE NEXT WEEK AS HIGH
PRESSURE ALOFT BUILDS WESTWARD INTO CALIFORNIA FROM THE DESERT
SOUTHWEST.

&&

.AVIATION...AS OF 10:50 PM PDT WEDNESDAY...LOW CLOUDS ARE
BEGINNING TO FILL IN THROUGH COASTAL GAPS AND VALLEYS WITH LIFR
TO IFR CIGS CURRENTLY BEING REPORTED OVER SELECT TERMINALS. LIGHT
WINDS WILL PERSIST THROUGH TONIGHT WITH SLIGHTLY STRONGER WINDS
EXPECTED DURING THE AFTERNOON HOURS ON THURSDAY.

VICINITY OF KSFO...IFR CIGS HAVE FILLED IN OVER KOAK. VFR
CONDITIONS EXPECTED THROUGH TONIGHT OVER KSFO. CLEARING
ANTICIPATED AROUND 17Z THURSDAY MORNING. MODERATE ONSHORE FLOW
AROUND 15 KT WILL EASE OVERNIGHT BECOMING LIGHT.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...LIFR TO IFR CIGS WILL PERSIST
THROUGH TONIGHT. CLEARING IS EXPECTED AROUND 17Z THURSDAY
MORNING. LIGHT TO MODERATE ONSHORE FLOW WILL PERSIST THROUGH THE
FORECAST PERIOD.

&&

.MARINE...AS OF 02:21 AM PDT THURSDAY...NORTHERLY FLOW WILL
INCREASE OVER THE COASTAL WATERS TODAY AS HIGH PRESSURE BUILDS OFF
THE WEST COAST. WINDS WILL BE STRONGEST NORTH OF POINT REYES.
GUSTY WINDS WILL ALSO BE POSSIBLE IN THE SAN FRANCISCO BAY THIS
AFTERNOON AND EVENING. THE INCREASED WINDS WILL PRODUCE STEEPER
WIND WAVES AND LOCALLY HAZARDOUS CONDITIONS. NORTHWEST SWELL WILL
INCREASE FRIDAY AND OVER THE WEEKEND.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TDAY...SCA...PT ARENA TO PT REYES 0-10 NM FROM 3 PM
             SCA...PT ARENA TO PT REYES 10-60 NM FROM 3 PM
             SCA...SF BAY NORTH OF THE BAY BRIDGE FROM 1 PM

&&

$$

PUBLIC FORECAST: SIMS
AVIATION: CW
MARINE: MM

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