000
FXUS66 KMTR 220805
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
105 AM PDT WED MAY 22 2013

.DISCUSSION...AS OF 9:00 PM PDT TUESDAY...AN UPPER LEVEL LOW MOVED
INTO THE PACIFIC NORTHWEST TODAY BRINGING A MUCH COOLER AIRMASS
TO THE AREA. HIGHS INLAND WERE 15-20 DEGREES COOLER THAN
YESTERDAY WHILE HIGHS WERE 5-10 DEGREES COOLER NEAR THE COAST.
COOL ADVECTION RESULTED IN INCREASED WINDS OVER MAINLY THE NORTH
AND EAST BAY AND NEAR THE COAST WITH WINDS 20-30 KT GUSTING AS
HIGH AS 45 KT.

THE UPPER LOW WILL CONTINUE OVER THE PACIFIC NORTHWEST THROUGH
THURSDAY. TEMPERATURES MAY DROP A FEW MORE DEGREES WEDNESDAY AND
THURSDAY AS THE LOW SHIFTS SLIGHTLY SOUTH. WITH THE COOL AIR IN
PLACE THE AIRMASS WILL STABILIZE AND WINDS ARE EXPECTED TO DROP
OFF BY WEDNESDAY. HOWEVER WINDS MAY PICK UP SOME ON THURSDAY
AFTERNOON AS A VORT CENTER ROTATING AROUND THE UPPER LOW MOVES
THROUGH THE AREA.

THE UPPER LOW WILL SHIFT NORTHEAST ON FRIDAY RESULTING IN SLIGHTLY
WARMER TEMPERATURES. BUT TEMPERATURES WILL CONTINUE TO BE BELOW
NORMAL AS ANOTHER UPPER TROUGH FOLLOWS CLOSELY BEHIND THE LOW AND
MOVES TOWARDS THE PACIFIC NORTHWEST SATURDAY. THE MEMORIAL DAY
WEEKEND IS SHAPING UP TO BE COOL THOUGH TEMPERATURES SHOULD BE A
LITTLE WARMER ON MEMORIAL DAY.

&&

.AVIATION...AS OF 1:05 AM PDT WEDNESDAY...MAINLY CLEAR SKIES WILL
PERSIST THROUGH THE NIGHT AS A TIGHT GRADIENTS MAINTAIN STRONG
WINDS ACROSS THE REGION. GUSTY WINDS WILL EASE A BIT THIS MORNING
THEN STRENGTHEN ONCE AGAIN BY THE AFTERNOON.

VICINITY OF KSFO...VFR. STRONG AND GUSTY WEST WINDS SUSTAINED AT
AROUND 20 TO 25 KT WITH GUSTS AS HIGH AS 30 KT EXPECTED THROUGH
THE MORNING HOURS. WINDS WILL STRENGTHEN TO AROUND 30 KT WITH
GUSTS TO 40 KT AFTER 21Z. AN AIRPORT WEATHER WARNING WILL LIKELY
NEED TO BE ISSUED FOR THIS AFTERNOON.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...VFR. MODERATE AND LOCALLY GUSTY
WEST WINDS WILL CONTINUE THROUGH MUCH OF THE PERIOD. STRONGEST
WINDS EXPECTED THIS AFTERNOON.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TNGT...SCA...PT REYES TO PIGEON PT 0-10 NM
             SCA...PIGEON PT TO PT PINOS 0-10 NM
             GLW...PT ARENA TO PIGEON PT 10-60 NM
             GLW...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM
             GLW...PIGEON PT TO PT PIEDRAS BLANCAS 10-60 NM
             SCA...PT ARENA TO PT REYES 0-10 NM FROM 3 AM
             GLW...PT ARENA TO PT REYES 0-10 NM UNTIL 3 AM
             SCA...ROUGH BAR ADVISORY FOR SF BAR
             SCA...SF BAY UNTIL 3 AM
             SCA...MRY BAY UNTIL 3 AM

&&

$$

PUBLIC FORECAST: W PI
AVIATION/MARINE: CW

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