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 191749
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
1049 AM PDT SAT APR 19 2014

.SYNOPSIS...A SLIGHT WARMING TREND WILL CONTINUE THROUGH THE
REMAINDER OF THE WEEKEND ALONG WITH DRY CONDITIONS. A WEAK STORM
SYSTEM WILL THEN IMPACT THE REGION MONDAY NIGHT THROUGH TUESDAY
AND BRING CHANCES FOR PRECIPITATION AND COOLER TEMPERATURES. QUIET
WEATHER AND NEAR NORMAL TEMPERATURES RETURN FOR THE LATTER HALF OF
NEXT WEEK.

&&

.DISCUSSION...AS OF 08:45 AM PDT SATURDAY...MOSTLY SUNNY SKIES
WITH PATCHY LOW CLOUDS AROUND THE AREA THIS MORNING UNDER A
SOMEWHAT DIFFUSE 2000 FT MARINE LAYER. ONSHORE FLOW SHOULD KEEP
THE COAST COOL REGARDLESS WITH THE SFO-SAC GRADIENT FORECAST TO
REACH 3.6 MB THIS AFTERNOON. A WEAK FRONTAL SYSTEM APPROACHING THE
WEST COAST TODAY WILL STAY WELL NORTH OF THE CWA DUE TO A BUILDING
UPPER LEVEL RIDGE. NO UPDATES NEEDED AT THIS TIME.

&&

.PREV DISCUSSION...AS OF 04:38 AM PDT SATURDAY...LOW CLOUDS HAVE
INCREASED ACROSS THE REGION THIS MORNING AS A 2000 FT MARINE LAYER
REMAINS IN PLACE. STRATUS WILL LIKELY STICK AROUND THROUGH LATE
MORNING BEFORE BURNING OFF BY EARLY AFTERNOON. THIS WILL KEEP
TEMPERATURES COOLEST ALONG THE COAST WITH A GENERALLY WEAK ONSHORE
FLOW. DAYTIME TEMPERATURES ACROSS INLAND AREAS WILL LIKELY BE
WARMER THAN PREVIOUS DAYS AS THE MID/UPPER LEVEL RIDGE BUILDS
ACROSS THE REGION. SLIGHTLY WARMER CONDITIONS CAN THEN BE EXPECTED
ON SUNDAY WITH WEAKER ONSHORE FLOW AND INCREASED 850MB
TEMPERATURES.

THE NEXT MID/UPPER LEVEL SYSTEM WILL BEGIN TO APPROACH THE PACIFIC
NORTHWEST ON MONDAY AND SWEEP ACROSS THE STATE MONDAY NIGHT
THROUGH TUESDAY. THIS FAST MOVING SYSTEM WILL HAVE LIMITED
MOISTURE TO WORK WITH AND WILL LIKELY ONLY PRODUCE LIGHT RAINFALL
AMOUNTS ACROSS PORTIONS OF THE REGION MONDAY NIGHT INTO TUESDAY
MORNING. RAIN CHANCES DIMINISH BY TUESDAY AFTERNOON/EVENING WITH
NOTICEABLY COOLER TEMPERATURES EXPECTED FOR TUESDAY AND WEDNESDAY.

DAYTIME TEMPERATURES WILL REBOUND FOR THE LATTER HALF OF THE
UPCOMING WORKWEEK AS THE MID/UPPER LEVEL RIDGE REBUILDS ALONG THE
WEST COAST. WITH THE RIDGE ALOFT...DRY WEATHER WILL ALSO CONTINUE
FOR THE SECOND HALF OF NEXT WEEK.

MEDIUM RANGE FORECAST MODELS CONTINUE TO AGREE THAT A STRONGER AND
WETTER STORM SYSTEM WILL IMPACT THE AREA LATE FRIDAY THROUGH NEXT
WEEKEND. CHANCES CONTINUE TO INCREASE FOR WIDESPREAD RAINFALL AS A
SLOW MOVING MID/UPPER LEVEL SYSTEM MOVES ACROSS THE REGION.

&&

.AVIATION...AS OF 10:50 AM PDT SATURDAY...SATELLITE IMAGERY SHOWS
THAT LOW CLOUDS HAVE CLEARED FROM ALL TERMINAL SITES. THERE ARE A
FEW HIGH CLOUDS STREAMING ACROSS THE STATE AT THIS TIME...AND LOW
CLOUDS OFF THE COAST. EXPECT LOW CLOUDS TO FORM AGAIN TONIGHT.

VICINITY OF KSFO...VFR TODAY AND TONIGHT. GUSTY WEST WINDS 20-28
KNOTS ARE FORECAST FOR THIS AFTERNOON AND EVENING.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...VFR. EXPECT MVFR CONDITIONS AGAIN
LATE TONIGHT.

&&

.MARINE...AS OF 10:50 AM PDT SATURDAY...GUSTY NORTHWEST WINDS IN
THE SMALL CRAFT ADVISORY CRITERIA ARE STILL EXPECTED IN THE
SOUTHERN WATERS TODAY AND TONIGHT.

A HIGH SURF ADVISORY HAS BEEN ISSUED FROM 5 AM SUNDAY TO 5 AM MONDAY
MORNING FOR THE COAST FROM SONOMA COUNTY SOUTH TO MONTEREY COUNTY.
NORTHWEST SWELL WILL BUILD TO 13 TO 15 FEET WITH SWELL PERIODS 15 TO
16 SECONDS.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TDAY...SCA...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM
             SCA...PT PINOS TO PT PIEDRAS BLANCAS 10-60 NM

&&

$$

PUBLIC FORECAST: RGASS
AVIATION/MARINE: SIMS

VISIT US AT WWW.WEATHER.GOV/SANFRANCISCO

FOLLOW US ON FACEBOOK, TWITTER, AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.SANFRANCISCOBAYAREA.GOV
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.