499
FXUS66 KSEW 171953
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
1253 PM PDT FRI APR 17 2026
SYNOPSIS
WEAK HIGH PRESSURE BUILDING OVER THE AREA FOR DRIER AND COOLER
CONDITIONS INTO SATURDAY. A WEAK FRONT WILL CLIP THE AREA ON
SUNDAY BUT MOST OF THE AREA WILL REMAIN DRY WITH WARMER
TEMPERATURES. WARM CONDITIONS CONTINUE THROUGH EARLY NEXT WEEK.
SHORT TERM /TONIGHT THROUGH SUNDAY/
UPPER RIDGING OFFSHORE WILL HELP CONDITIONS REMAIN QUIET AND
CALM THIS AFTERNOON WITH A MIX OF SUN AND CLOUDS. HIGH
TEMPERATURES THIS AFTERNOON WILL GENERALLY RANGE IN THE MID TO
UPPER 50S FOR LOCATIONS ALONG THE INTERIOR, WHILE AREAS ALONG
THE COAST COULD SEE TEMPERATURES IN THE LOW TO MID 50S. AS FOR
OVERNIGHT TEMPERATURES, WE'RE LOOKING AT LOWS IN THE MID TO
UPPER 30S, EVEN LOWER 40S IN SOME SPOTS. WITH CLOUD COVER
REMAINING THROUGHOUT THE OVERNIGHT, NOT SEEING MUCH IN TERMS OF
FROST POTENTIAL, WITH MINIMAL IMPACTS EXPECTED DUE TO OVERALL
WARMER TEMPERATURES.
HIGH TEMPERATURES ON SATURDAY WILL WARM CONSIDERABLY, WITH
TEMPERATURES IN THE UPPER 60S, WITH SOME LOCATIONS POSSIBLY
SEEING TEMPS IN THE LOW 70S. OVERNIGHT LOWS WILL BE WARMER THAN
PREVIOUS NIGHTS, WITH LOWS IN THE MID TO UPPER 40S.
AN UPPER LEVEL LOW WILL DIG ALONG THE COAST ON SUNDAY BUT LATEST
GUIDANCE SHOWS IT SHIFTING SOUTHWARD AND GRAZING OUR WATERS. A
WEAK FRONT WILL CLIP OUR COASTAL WATERS BUT OVERALL WESTERN
WASHINGTON SHOULD STAY RELATIVELY DRY WITH HIGH TEMPERATURES
STILL IN THE UPPER 60S INTO LOWER 70S.
LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/
THE AFOREMENTIONED UPPER LEVEL LOW WILL MAKE ITS WAY INLAND
ALONG THE OREGON COAST WITH A CHANCE FOR SOME WRAP-AROUND
MOISTURE MONDAY INTO TUESDAY. WE'LL SEE MINOR HEATRISK ACROSS
INTERIOR LOCATIONS ON MONDAY WITH HIGH TEMPERATURES IN THE LOW
TO MID 70S FOR SOME INTERIOR LOCATIONS - AREAS ALONG THE WATER
WILL SEE TEMPS IN THE MID 60S. ENSEMBLE GUIDANCE SHOWS RENEWED
PRECIPITATION CHANCES MIDWEEK AS WRAP AROUND MOISTURE BRINGS
CONTINUED SHOWERS ACROSS THE REGION, WITH A COOL DOWN TO NORMAL
TEMPERATURES IN THE UPPER 50S TO 60S.
MAZURKIEWICZ
AVIATION...VFR CIGS AREA WIDE THIS AFTERNOON, WITH VARYING
DIRECTIONS OF SURFACE FLOW FROM WESTERLY TO NORTHEASTERLY. THE ONSET
OF NORTHERLY WINDS IN PUGET SOUND HAS BEEN PUSHED BACK AND MAY
REMAIN VARIABLE FOR LONGER THAN INITIALLY THOUGHT. MAGNITUDES OF THE
WIND SPEEDS WILL BE LESS THAN 7-8 KTS THROUGHOUT THE PERIOD AS HIGH
PRESSURE MOVES INTO THE REGION AND SLOWS DOWN THE GENERAL AIRMASS.
VFR CIGS ARE EXPECTED TO CONTINUE INTO TOMORROW MORNING WITH LIGHT
AND VARIABLE FLOW.
KSEA...LATEST GUIDANCE AND OBSERVATIONS HAVE SHOWN SURFACE WINDS
BECOMING MORE WESTERLY AS OPPOSED TO NORTHERLY. NORTHERLY WINDS ARE
STILL LIKELY TO OCCUR, BUT MORE SO AFTER 22-00Z THIS AFTERNOON. THE
TOP RANGE OF THE WIND SPEED WILL BE 7 KTS. SPEEDS DECREASE BELOW 5
KTS AFTER 03Z. VFR CIGS EXPECTED THROUGHOUT THE PERIOD WITH LIGHT
AND VARIABLE FLOW BY TOMORROW MORNING.
21
MARINE
HIGH PRESSURE WEAKENS SLIGHTLY AS THE NEXT WEEK FRONT
DROPS IN FROM THE NORTH INTO SATURDAY. THIS WILL BRING UP THE SEAS
OVER THE FAR OUTER COASTAL WATERS UP TO AROUND 7 FEET LATE SATURDAY
NIGHT, DECREASING TO 5 FT SUNDAY AFTERNOON. SEAS RISE AGAIN SLIGHTLY
ON MONDAY AS ANOTHER WEAK SYSTEM TRAVERSES THE WATERS. WINDS WILL BE
STRONGER OVER THE OUTER COASTAL WATERS DURING THIS TIMEFRAME AS
WELL, PEAKING ON WEDNESDAY.
21
HYDROLOGY
RIVER FLOODING IS NOT EXPECTED THROUGH THE NEXT SEVEN DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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