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

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS66 KMTR 251144
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
444 AM PDT MON MAY 25 2015

.SYNOPSIS...COOLER THAN NORMAL WEATHER...ALONG WITH WIDESPREAD
NIGHT AND MORNING LOW CLOUDS...WILL CONTINUE THROUGH TUESDAY. WARMER
CONDITIONS ARE EXPECTED DURING THE SECOND HALF OF THE
WEEK...ESPECIALLY FOR INLAND AREAS. HOWEVER...COASTAL AREAS WILL
REMAIN SEASONABLY COOL AS ONSHORE FLOW PERSISTS.

&&

.DISCUSSION...AS OF 3:45 AM PDT MONDAY...COOLER THAN NORMAL
WEATHER CONDITIONS...WHICH HAVE PERSISTED ACROSS THE SAN FRANCISCO
BAY AREA AND MONTEREY BAY AREA FOR THE PAST THREE WEEKS...WILL
CONTINUE FOR AT LEAST A FEW MORE DAYS. ALTHOUGH AN UPPER RIDGE HAS
DEVELOPED OFFSHORE ALONG 135W...AN UPPER LOW IS SETTLING INTO THE
PAC NW AND HELPING TO MAINTAIN A DEEP MARINE LAYER ACROSS OUR AREA.
AND...COOL MARINE AIR IS FLOWING WELL INLAND THANKS TO A PERSISTENT
ONSHORE FLOW.

LITTLE CHANGE IS EXPECTED THROUGH TUESDAY. WIDESPREAD NIGHT AND
MORNING LOW CLOUDS WILL PERSIST...ALONG WITH PATCHY DRIZZLE NEAR
THE OCEAN. DAYTIME TEMPERATURES WILL REMAIN IN THE UPPER 50S ALONG
THE IMMEDIATE COAST WHERE LITTLE OR NO AFTERNOON SUN IS EXPECTED.
AFTERNOON CLEARING IS EXPECTED INLAND...BUT HIGH TEMPERATURES WILL
CONTINUE TO BE AT LEAST FIVE DEGREES BELOW NORMAL IN MOST
LOCATIONS.

THE MODELS HAVE BEEN CONSISTENT IN MOVING THE UPPER RIDGE TO THE
EAST BY MIDWEEK...WITH THE RIDGE AXIS POSITION FORECAST TO BE OVER
THE WEST COAST BY LATE THURSDAY. AS THE RIDGE BUILDS OVER CA
DURING THE SECOND HALF OF THE WEEK...LOOK FOR THE MARINE LAYER TO
BE COMPRESSED AND TEMPERATURES TO RISE...ESPECIALLY INLAND...AS
THE AIRMASS WARMS ALOFT AND MARINE AIR INFLUENCE DWINDLES. INLAND
TEMPERATURES ARE FORECAST TO RISE A FEW DEGREES ABOVE NORMAL BY
THURSDAY AND FRIDAY WHEN 80S WILL FINALLY RETURN TO LOCATIONS LIKE
LIVERMORE...GILROY AND CALISTOGA. A SHALLOW...BUT
PERSISTENT...MARINE LAYER ALONG WITH CONTINUED ONSHORE FLOW WILL
MEAN THE COASTAL STRIP WILL SEE MUCH LESS WARMING COMPARED TO
INLAND AREAS LATER THIS WEEK.

WARM CONDITIONS WILL CONTINUE INTO AT LEAST THE FIRST PART OF NEXT
WEEKEND. BUT THE RIDGE IS FORECAST TO MOVE EASTWARD OVER THE
WEEKEND AS A TROUGH APPROACHES THE WEST COAST. THIS WILL MEAN
COOLER CONDITIONS BY SUNDAY.

OTHER THAN PATCHY LATE NIGHT AND MORNING COASTAL DRIZZLE THE NEXT
FEW DAYS...NO PRECIPITATION IS FORECAST THROUGH NEXT WEEKEND.

&&

.AVIATION...AS OF 4:44 AM PDT MONDAY...FOR 12Z TAFS. WIDESPREAD
STRATUS BLANKETS THE REGION UNDER A 2600 FT MARINE LAYER THIS
MORNING. PARTIAL CLEARING IS EXPECTED LATER TODAY. HOWEVER KSFO
AND KOAK ALONG WITH MONTEREY BAY TERMINALS ARE NOT EXPECTED TO
CLEAR BUT RATHER WILL SEE CIGS LIFT TEMPORARILY TO AROUND
1500-2000 FT IN THE AFTERNOON. LIGHT TO LOCALLY MODERATE ONSHORE
FLOW WILL CONTINUE THROUGH TONIGHT.

VICINITY OF KSFO...MVFR CIGS WILL PREVAIL THROUGH THE MORNING.
CIGS WILL LIFT TO AROUND 1500 FT AFTER 20Z THIS AFTERNOON WITH
VERY LITTLE HOPE OF AREA TERMINALS SCATTERING OUT. LIGHT TO LOCALLY
MODERATE ONSHORE FLOW WILL PREVAIL.

KSFO BRIDGE APPROACH...IFR CIGS AROUND 1000 FEET EXPECTED THROUGH
EARLY THIS MORNING. CIGS WILL CLEAR FROM THE SOUTH LATER THIS MORNING
BUT AREA TERMINALS WILL REMAIN OVC AROUND 1500 FEET THROUGH THE
AFTERNOON.

MONTEREY BAY AREA TERMINALS...BORDERLINE IFR/MVFR CIGS WILL PERSIST
THROUGH THE MORNING. CIGS WILL LIFT AFTER 18Z-19Z MONDAY BUT AREA
TERMINALS ARE NOT EXPECTED TO CLEAR. LIGHT ONSHORE FLOW WILL
PREVAIL.

&&

.MARINE...AS OF 3:00 AM PDT MONDAY...NORTHWESTERLY WINDS WILL
CONTINUE ACROSS THE COASTAL WATERS TODAY THEN GRADUALLY EAST INTO
TUESDAY WITH FAIRLY LIGHT SEAS. SOME SLIGHTLY STRONGER NORTHWEST
WINDS WILL RETURN BY LATE IN THE WEEK BUT IN GENERAL EXPECT A
PROLONGED PERIOD OF GENERALLY LIGHT WIND AND SEAS.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TDAY...SCA...SF BAY NORTH OF THE BAY BRIDGE FROM NOON

&&

$$

PUBLIC FORECAST: DYKEMA
AVIATION/MARINE: CW

VISIT US AT WEATHER.GOV/SANFRANCISCO

FOLLOW US ON FACEBOOK, TWITTER, AND YOUTUBE AT:
WWW.FACEBOOK.COM/NWSBAYAREA
WWW.TWITTER.COM/NWSBAYAREA
WWW.YOUTUBE.COM/NWSBAYAREA




USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.