287
FXUS66 KSEW 082239
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
339 PM PDT FRI AUG 8 2025
SYNOPSIS
UPPER LEVEL RIDGING OVER WESTERN WASHINGTON WILL
MAINTAIN A DRY AND WARMER PATTERN INTO EARLY NEXT WEEK. MODERATE
HEATRISK IS EXPECTED FOR SUNDAY AND MONDAY ACROSS THE INTERIOR, WITH
HIGHS IN THE 80S AND LOW 90S. THE RIDGE WILL WEAKEN ON TUESDAY
AND UPPER LEVEL TROUGHING WILL SETTLE OVER THE AREA THROUGH LATE
IN THE WEEK. THIS WILL BRING COOLER TEMPERATURES TO WESTERN
WASHINGTON.
SHORT TERM /TONIGHT THROUGH MONDAY/
LATEST VISIBLE IMAGERY
SHOWS MOSTLY CLEAR SKIES ACROSS WESTERN WASHINGTON, WITH A FEW HIGH
CLOUDS PASSING THROUGH. TODAY IS THE BEGINNING OF A WARMING TREND
FOR THE PACIFIC NORTHWEST. AN UPPER LEVEL RIDGE WILL BRING DRY AND
WARMER CONDITIONS THROUGH MONDAY. ANOTHER ROUND OF MARINE STRATUS IS
IN STORE FOR SATURDAY MORNING, BUT IT SHOULD PRIMARILY REMAIN
CONFINED TO THE IMMEDIATE COAST. THE STRATUS WILL SCATTER IN THE
AFTERNOON, GIVING WAY TO MOSTLY CLEAR SKIES ACROSS WESTERN
WASHINGTON. HIGH TEMPERATURES ON SATURDAY WILL BE IN THE UPPER 60S
TO LOW 70S ACROSS THE COAST AND MID 70S TO LOW 80S ACROSS THE
INTERIOR. HEATRISK ON SATURDAY WILL BE IN THE MINOR (YELLOW)
CATEGORY FOR THE MAJORITY OF THE AREA. THE WARMEST DAYS ARE STILL ON
TRACK TO BE SUNDAY AND MONDAY, WITH MONDAY BEING THE WARMEST DAY.
HIGH TEMPERATURES ON SUNDAY AND MONDAY ALONG THE COAST WILL BE IN
THE MID TO UPPER 70S. ACROSS THE INTERIOR, HIGH TEMPERATURES WILL BE
PRIMARILY BE IN THE 80S. SOME LOCATIONS ALONG THE CASCADE FOOTHILLS
AND SOUTHERN INTERIOR ARE LIKELY TO SEE HIGH TEMPERATURES IN THE
90S. CONSEQUENTLY, HEATRISK WILL INCREASE INTO THE MODERATE CATEGORY
(ORANGE), WITH MODERATE HEATRISK BEING MORE WIDESPREAD ON MONDAY.
IN ADDITION, OVERNIGHT RELIEF WILL BE LIMITED SUNDAY AND MONDAY,
PARTICULARLY ACROSS THE CASCADE FOOTHILLS, WHERE OVERNIGHT LOW
TEMPERATURES ARE EXPECTED TO BE IN THE LOW 60S.
LONG TERM /TUESDAY THROUGH FRIDAY/
LONG TERM GUIDANCE IS IN GOOD
AGREEMENT THAT THE UPPER LEVEL RIDGE WILL WEAKEN ON TUESDAY AND AN
UPPER LEVEL TROUGH WILL SETTLE INTO THE AREA MIDWEEK INTO LATE IN
THE WEEK. THERE IS SOME UNCERTAINTY REGARDING HOW MUCH TEMPERATURES
WILL COOL DOWN ON TUESDAY. HOWEVER BY WEDNESDAY, TEMPERATURES COOL
DOWN INTO THE LOW 70S ACROSS THE INTERIOR AND THE LOW 60S ALONG THE
COAST. IN ADDITION TO COOLER TEMPERATURES, EXPECT CLOUDIER
CONDITIONS. THE CHANCE OF LIGHT SHOWERS RETURN THURSDAY INTO
FRIDAY.
29
AVIATION
HIGH PRESSURE BUILDING ACROSS THE REGION
TONIGHT, MAINTAINING PREDOMINANTLY CLEAR SKIES ACROSS WESTERN
WASHINGTON. EXPECT A FEW AREAS OF LOW CLOUDS NEAR THE COAST AND
INTERIOR RIVER VALLEYS TO DEVELOP AGAIN TONIGHT. OTHERWISE, BREEZY
NORTHWESTERLY WINDS CONTINUE THIS EVENING BEFORE EASING OVERNIGHT.
MOST AREAS SHOULD REMAIN FREE OF LOW CLOUDS TONIGHT WITH BUILDING
HIGH PRESSURE AND DRYING LOW LEVELS, BUT THE COAST AND AREAS SUCH AS
KPWT AND KOLM MAY AGAIN SEE SOME PATCHY LOW CLOUDS. OTHERWISE, A
REPEAT IS EXPECTED SATURDAY WITH VFR CONDITIONS PREVAILING ACROSS
THE REGION.
KSEA...NORTHWEST SURFACE WINDS AT 7-8 KT THIS AFTERNOON AND EVENING.
FEW CLOUDS AROUND BUT NO CEILING CONCERNS WITH VFR THROUGH THE
PERIOD. A FEW PATCHES OF LOW CLOUDS COULD DEVELOP BEYOND THE
TERMINAL AREA LATE TONIGHT/EARLY SATURDAY, BUT ARE NOT EXPECTED TO
DEVELOP AT KSEA. CULLEN
MARINE
HIGH PRESSURE WILL GRADUALLY REBUILD OVER THE NORTHEASTERN
PACIFIC THIS WEEKEND THROUGH THE START OF NEXT WEEK. HAVE MAINTAINED
THE ADVISORY FOR THE CENTRAL AND EASTERN STRAIT THIS EVENING, BUT IT
LOOKS MARGINAL WITH GUSTS TO 25 KT. AS HIGH PRESSURE BUILDS OVER THE
WATERS, WITH A WEAK THERMAL TROUGH ALONG THE COASTLINE,
NORTHWESTERLY WINDS WILL BUILD OVER THE COASTAL WATERS EARLY NEXT
WEEK. SEAS AROUND 3 TO 5 FT OVER THE COASTAL WATERS THIS WEEKEND,
BUILDING CLOSER TO 7 FT BY SUNDAY. WILL NEED TO MONITOR THE
STEEPNESS OF THESE WAVES, WHICH MAY REACH ADVISORY CRITERIA. MORE
SIGNIFICANT, SEAS OVER THE OUTER COASTAL WATERS WILL APPROACH 10 FT
MONDAY THROUGH THE FIRST HALF OF NEXT WEEK. CULLEN
FIRE WEATHER
THERE'LL BE GOOD OVERNIGHT RH RECOVERIES TONIGHT
INTO SATURDAY. THE NEXT ELEVATED FIRE WEATHER CONCERN WILL BE THE HOT
AND DRY PATTERN EXPECTED LATER THIS WEEKEND INTO EARLY NEXT WEEK
AS RIDGING BUILDS IN OVER THE AREA FROM THE PACIFIC. WARMING
TEMPERATURES, WITH HIGHS IN THE 80S TO LOW 90S AND MINIMUM
RELATIVE HUMIDITIES DIPPING DOWN INTO THE 20S AND 30S BY EARLY
NEXT WEEK WILL ELEVATE FIRE WEATHER CONCERNS ACROSS PORTIONS OF
THE INTERIOR AND IN THE CASCADE FOOTHILLS. ENSEMBLES THEN SUGGEST
TROUGHING REDEVELOPING ACROSS THE REGION AGAIN BY MIDWEEK, WHICH
WOULD HELP MODERATE TEMPERATURES AND INCREASE ONSHORE FLOW.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...SMALL CRAFT ADVISORY UNTIL 2 AM PDT SATURDAY FOR CENTRAL U.S.
WATERS STRAIT OF JUAN DE FUCA-EAST ENTRANCE U.S. WATERS
STRAIT OF JUAN DE FUCA.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page