Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 030451
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
850 PM PST MON MAR 2 2015

.SYNOPSIS...HIGH PRESSURE OVER THE AREA AND LOW LEVEL OFFSHORE FLOW
WILL KEEP CONDITIONS DRY WITH NEAR NORMAL HIGH TEMPERATURES AND
CHILLY OVERNIGHT TEMPERATURES THROUGH MIDWEEK. A WEATHER SYSTEM
MOVING INTO BRITISH COLUMBIA THURSDAY WILL WEAKEN THE RIDGE BRINGING
A CHANCE OF SHOWERS MAINLY TO THE NORTH CASCADES. HIGH PRESSURE AND
DRY WEATHER WILL RETURN FOR THE WEEKEND.

&&

.SHORT TERM...HIGH PRESSURE AT THE SURFACE IN EASTERN BRITISH
COLUMBIA AND ALBERTA CONTINUES TO SUPPORT LOW LEVEL OFFSHORE
GRADIENTS AND OUTFLOW THROUGH THE FRASER VALLEY TONIGHT. THE
NORTHERLY FLOW COUPLED WITH CLEAR SKIES WILL DRIVE CHILLY OVERNIGHT
TEMPERATURES TONIGHT AND TUESDAY NIGHT ESPECIALLY IN SHELTERED
LOCALES. EXPECT LOWS TO DIP INTO THE LOW 30S TONIGHT AND DOWN INTO
THE UPPER 20S TUESDAY NIGHT. THE UPPER LEVEL ALONG 140W WILL SHIFT
EAST AND WEAKEN THURSDAY AS A WEAK SYSTEM MOVES INTO BRITISH
COLUMBIA. THIS WILL BRING ONSHORE FLOW...CLOUDS AND A CHANCE OF
PRECIPITATION MAINLY TO THE NORTH CASCADES. ONSHORE FLOW AND
INCREASED CLOUD COVER WEDNESDAY NIGHT AND THURSDAY WILL HELP
OVERNIGHT TEMPERATURES WILL ALSO RETURN TO MILDER LEVELS INTO THE
WEEKEND.

.LONG TERM...THE UPPER LEVEL RIDGE WILL REBOUND INSIDE OF 130W ON
FRIDAY WHILE SURFACE HIGH PRESSURE SETTLES ONCE AGAIN INTO EASTERN
BRITISH COLUMBIA AND ALBERTA. THIS WILL SET THE STAGE FOR THE NOW
FAMILIAR PATTERN OF OFFSHORE FLOW AND DRY CONDITIONS INTO EARLY NEXT
WEEK. HIGH TEMPERATURES WILL CREEP UP INTO THE UPPER 50S SATURDAY
AND INTO THE LOW 60S OVER THE SOUTH INTERIOR ON SUNDAY.

&&

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

&&

.AVIATION...DRY NORTHERLY FLOW WILL PREVAIL ACROSS WESTERN WA
TONIGHT. THE AIR MASS IS DRY AND STABLE. VFR CONDITIONS EXPECTED.
GUSTY NORTH WINDS WILL EASE OVERNIGHT. SKIES WILL REMAIN CLEAR ON
TUE. 33

KSEA...NE SURFACE WINDS TONIGHT WITH CLEAR SKIES. VFR CONDITIONS
WILL CONTINUE. 33

&&

.MARINE...HIGH PRES OVER WESTERN CANADA IS GIVING N/NE FLOW ACROSS
WESTERN WA TONIGHT. SMALL CRAFT ADVISORIES ARE IN EFFECT FOR ALL
WATERS. THE NORTHERN INLAND WATERS WILL SEE FRASER RIVER OUTFLOW
WINDS TO 30 KT. WINDS WILL EASE ON TUESDAY AS HIGH PRES SHIFTS EAST.
HIGH PRESSURE WILL GIVE GENERALLY LIGHT WINDS OVER THE WATERS
THROUGH THE END OF THE WEEK. 33

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...SMALL CRAFT ADVISORIES ARE IN EFFECT FOR ALL WATERS.

&&

$$

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