Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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 KSEW 261612
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
912 AM PDT SAT JUL 26 2014

.SYNOPSIS...HIGH PRESSURE ALOFT AND WEAK LOW LEVEL ONSHORE FLOW
WILL PREVAIL ACROSS THE AREA THROUGH NEXT WEEK.

&&

.SHORT TERM...
THERE WERE AREAS OF LOW CLOUDS AND/OR FOG OVER MAINLY THE NORTH
COAST AND NORTHWEST INTERIOR THIS MORNING. THE CLOUDS AND FOG
SHOULD DISSIPATE LATER THIS MORNING...LEAVING THE ENTIRE CWA UNDER
BRIGHT...SUNNY SKIES.

MEANWHILE...AN UPPER RIDGE CENTERED OVER THE DESERT SOUTHWEST WILL
DOMINATE THE WEATHER PATTERN OVER THE REGION THROUGH MON. THE
RIDGE AXIS WILL REMAIN TO OUR EAST...THUS ANTICIPATE LIGHT LOW
LEVEL ONSHORE FLOW TO PERSIST...RESULTING IN AREAS OF NIGHT/
MORNING STRATUS AND FOG OVER MAINLY THE COAST. TEMPS WILL RUN
ABOVE NORMAL ACROSS MUCH OF THE CWA.

.LONG TERM FROM THE PREV DISCUSSION...
00Z EXTENDED MODELS RUNS IN GOOD AGREEMENT THAT THERE WILL BE
LITTLE CHANGE IN THE PATTERN...BOTH SURFACE AND ALOFT THROUGH THE
END OF NEXT WEEK. THE FLOW ALOFT WILL BECOME A BIT MORE SOUTHERLY
LATE IN THE PERIOD WHICH WILL BRING UP THE POSSIBILITY OF LATE
DAY CONVECTION IN THE CASCADES BUT WILL LEAVE THIS OUT OF THE
FORECAST FOR NOW. WILL STAY WITH THE IDEA OF HIGH TEMPERATURES 5
TO 10 DEGREES ABOVE NORMAL FOR THE INTERIOR. THE NORTHWESTERLY
SURFACE GRADIENTS WILL KEEP THE AFTERNOON SEA BREEZE IN PLAY ALONG
THE COAST KEEPING HIGHS THERE AROUND 70 DEGREES. WHAT LITTLE IN
THE WAY OF LOW CLOUDS THAT WILL DEVELOP WILL BE MOSTLY CONFINED TO
THE COAST. FELTON

&&

.AVIATION...WEAK UPPER LEVEL RIDGING AND LOW LEVEL ONSHORE FLOW WILL
PERSIST THROUGH THE WEEKEND. MODERATE WESTERLY FLOW ALOFT WILL
BECOME SOUTHWESTERLY THIS AFTERNOON AS THE UPPER LEVEL RIDGE AXIS
SHIFTS EAST AND AMPLIFIES.

THE AIR MASS OVER WESTERN WASHINGTON WILL REMAIN GENERALLY DRY AND
STABLE THROUGH THE WEEKEND. LOW CLOUDS ARE MAINLY CONFINED TO THE
NORTHERN COAST...STRAIT...AND WHATCOM COUNTY EXTENDING EAST INTO THE
MOUNTAINS. THESE CLOUDS SHOULD SCATTER OUT TO SUNNY SKIES BY
AFTERNOON. CLOUDS WILL REFORM AGAIN EARLY SUNDAY MORNING...REMAINING
SIMILARLY CONSTRAINED TO THE COAST AND STRAIT...AND BURNING OFF BY
LATE MORNING.

KSEA...CLEAR SKIES THROUGH TONIGHT...WITH LITTLE OR NO STRATUS
EXPECTED SUNDAY MORNING. NORTHERLY WINDS 4 TO 9 KTS.

&&

.MARINE...A PERSISTENT PATTERN OF HIGH PRESSURE OVER THE COASTAL
WATERS AND LOWER PRESSURE INLAND WILL SUPPORT ONSHORE FLOW THROUGH
EARLY NEXT WEEK. AS IS TYPICAL WITH THIS SORT OF PATTERN...EXPECT
STRONGEST WINDS THROUGH THE CENTRAL AND EAST STRAIT...LIKELY
REACHING SMALL CRAFT ADVISORY LEVELS AT TIMES ESPECIALLY DURING THE
LATE AFTERNOON AND EVENING HOURS.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM THIS AFTERNOON TIL
     2 AM SUNDAY FOR THE CENTRAL AND EASTERN STRAIT OF JUAN DE
     FUCA.


&&

$$

WWW.WEATHER.GOV/SEATTLE

FOR THE GRAPHICAL AFD...VISIT
WWW.WEATHER.GOV/SEATTLE/GAFD/LATEST_WEBAFD.HTML




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