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 261550
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
900 AM PDT THU MAR 26 2015

.SYNOPSIS...AN UPPER RIDGE IS OVER THE REGION TODAY FOR DRY WEATHER.
A FRONT WILL MOVE THROUGH WESTERN WASHINGTON FRIDAY EVENING. A WEAK
UPPER RIDGE OVER THE PACIFIC NORTHWEST THIS WEEKEND WILL STEER
WEATHER SYSTEMS INTO BRITISH COLUMBIA. A STRONGER COLD FRONT WILL
SWEEP THROUGH THE AREA MONDAY NIGHT.

&&

.SHORT TERM...AN UPPER RIDGE WILL IS OVER THE REGION AND TODAY WILL
BE DRY AND WARM WITH HIGHS IN THE 60S. THE RIDGE WILL SHIFT EAST
TONIGHT AND FRIDAY AS A FRONT APPROACHES. THE FRONT WILL BRING RAIN
TO THE COAST FRIDAY AFTERNOON AND THE INTERIOR OF WESTERN WA FRIDAY
NIGHT. WESTERLY FLOW ALOFT WITH LOW LEVEL ONSHORE FLOW SHOULD KEEP
SATURDAY ON THE CLOUDY SIDE...WITH SOME SHOWERS LINGERING IN THE
CASCADES AND PERHAPS A PSCZ. A WARM FRONT WILL BRUSH THE NORTH COAST
LATER IN THE DAY ON SATURDAY.

.LONG TERM...THE UPPER RIDGE OVER THE REGION THIS WEEKEND SHOULD
PROTECT MOST OF WESTERN WA FROM WEATHER SYSTEMS TRACKING INTO B.C.
THE B.C. COAST AND MUCH OF VANCOUVER ISLAND WILL BE WET THIS
WEEKEND...AND THE NORTH WA COAST MIGHT SEE PERIODS OF RAIN. THE
SOUTH WA COAST AND THE INLAND PORTION OF WESTERN WA SHOULD BE DRY
AND MILD WITH 500MB HEIGHTS IN THE 560S. THE WEAK FLAT RIDGE WILL
GIVE OUT MONDAY AND A DECENT COLD FRONT WILL REACH THE AREA BY
MONDAY EVENING. THAT WILL BE FOLLOWED BY A PERIOD OF FAIRLY STRONG
ZONAL FLOW AND COLD AIR ALOFT. A SECOND EMBEDDED FRONTAL WAVE SHOULD
REACH WESTERN WA LATER TUE. THE FORECAST WILL NEED TO BE PUSHED
COOLER AND WETTER STARTING NEXT TUESDAY.

&&

.HYDROLOGY...FLOODING IS UNLIKELY THE NEXT 7 DAYS.

&&

.AVIATION...AN UPPER LEVEL RIDGE OVER THE PAC NW WILL BRING DRY AND
STABLE WEATHER TO WESTERN WA TODAY. THE FLOW ALOFT IS WESTERLY.
THERE IS PATCHY LOW CLOUDS AND FOG OVER THE SOUTH SOUND THIS
MORNING...OTHERWISE EXPECT VFR CONDITIONS TODAY. THE RIDGE WILL EXIT
EAST ON FRIDAY AS A COLD FRONT MOVES INLAND. RAIN WILL REACH THE
COAST BY 00Z SAT. 33

KSEA...VFR CONDITIONS TODAY WITH LIGHT SOUTHERLY SURFACE WINDS. 33

&&

.MARINE...WEAK HIGH PRESSURE WILL BUILD OVER WESTERN WA TODAY FOR
GENERALLY LIGHT WINDS OVER THE WATERS. A COLD FRONT WILL MOVE INLAND
LATE FRIDAY AFTERNOON OR EVENING. ONSHORE FLOW WILL INCREASE BEHIND
THIS FRONT FRIDAY NIGHT WITH SMALL CRAFT ADVISORY WEST WINDS
FORECAST THROUGH THE CENTRAL/EAST STRAIT OF JUAN DE FUCA. HIGH
PRESSURE WILL REBUILD OVER THE REGION ON SATURDAY. A FRONTAL
BOUNDARY WILL STALL OVER SOUTHERN B.C. ON SUNDAY...WITH SMALL CRAFT
ADVISORY WINDS POSSIBLE OVER THE COASTAL WATERS. 33

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...NONE.

&&

$$

YOU CAN SEE AN ILLUSTRATED VERSION OF THIS FORECAST DISCUSSION AT
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.