252
FXUS66 KSEW 080843
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
143 AM PDT FRI MAY 8 2026
SYNOPSIS
A WEAK FRONTAL SYSTEM WILL MOVE ACROSS WESTERN WASHINGTON TODAY
PRODUCING LITTLE MORE THAN SOME CLOUD COVER. HIGH PRESSURE ALOFT
WILL REBUILD INTO THE AREA ON SATURDAY FOR THE RETURN OF SOME
SUNSHINE AND SOMEWHAT WARMER TEMPERATURES. ANOTHER WEAK SYSTEM
WILL CLIP THE AREA ON SUNDAY FOR ADDITIONAL CLOUDS AND A LITTLE
COOLING. HIGH PRESSURE WILL REBOUND ONCE AGAIN EARLY NEXT WEEK
FOR A WARMING TREND.
SHORT TERM /TODAY THROUGH SUNDAY/
A WEAK UPPER TROUGH WILL SWING INLAND ACROSS WESTERN WASHINGTON
THIS MORNING SPREADING CLOUDS ACROSS THE AREA, BUT LITTLE TO NO
PRECIPITATION. THE TROUGH WILL BE EAST OF THE CASCADES BY LATE
THIS AFTERNOON WITH SOME SUNSHINE RETURNING FOR MOST AREAS.
WITH ONSHORE FLOW IN PLACE, HIGH TEMPERATURES WILL BE SIMILAR TO
THOSE OF YESTERDAY. UPPER RIDGING REBUILDS INTO THE REGION
TONIGHT INTO EARLY SATURDAY WITH THE LOW LEVEL FLOW TURNING
NORTHERLY. WITH THE BUMP IN HEIGHTS AND ABSENCE OF ONSHORE
FLOW, HIGH TEMPERATURES WILL CLIMB A HANDFUL OF DEGREES. ANOTHER
SYSTEM WILL CLIP THE AREA ON SUNDAY FOR ADDITIONAL CLOUD COVER
AND PERHAPS A BRIEF SHOWER UP ACROSS THE OLYMPIC PENINSULA AND
NORTH INTERIOR. IN TYPICAL FASHION, NBM TEMPERATURES USED IN
THE FORECAST ARE UNDERESTIMATING THE AMOUNT OF COOLING. LOOK FOR
5 TO 7 DEGREES OF COOLING ON SUNDAY...ESPECIALLY IN THE
INTERIOR.
LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/
UPPER LEVEL RIDGING WILL AMPLIFY OVER THE PACIFIC NORTHWEST
EARLY NEXT WEEK IN RESPONSE TO AN UPPER TROUGH THAT WILL DIG
SOUTHWARD WELL OFFSHORE. BY TUESDAY, 850 MILLIBAR TEMPERATURES
CLIMB TO AROUND 15C, BUT THE LOW LEVEL FLOW STAYS WEAKLY ONSHORE
WHICH WILL KEEP TEMPERATURES IN CHECK...MID OR UPPER 70S IN THE
WARMEST SPOTS.
ENSEMBLE SOLUTIONS BEGIN TO SOW SOME CONSIDERABLE UNCERTAINTY
INTO THE FORECAST BY THE MIDDLE PORTION OF THE COMING WEEK AS
THEY, PERHAPS UNSURPRISINGLY, HAVE TROUBLE RESOLVING WHAT
ULTIMATELY BECOMES OF A CLOSED OFF UPPER LOW WEST OF
NORTH/CENTRAL CALIFORNIA. THEY'RE SPLIT BETWEEN BRINGING A
PORTION OF IT ONSHORE OR LEAVING IT TO AIMLESSLY WANDER
OFFSHORE. EITHER WAY, THE MAIN IMPACT WILL BE ON TEMPERATURES
WITH THE PRECIPITATION OUTLOOK REMAINING PARTICULARLY DRIER THAN
WHAT WE'D EXPECT IN THE FIRST HALF OF MAY.
27
AVIATION
WESTERLY TO SOUTHWESTERLY FLOW ALOFT AS AN UPPER
LEVEL RIDGE MOVES OVER WESTERN WASHINGTON. VFR AT ALL TERMINALS
EARLY THIS MORNING WITH SOME MID TO HIGH LEVEL CLOUDS AROUND.
CEILINGS MAY LOWER TO 4000 TO 5000 ACROSS THE AREA, BUT WILL
EXPECT TO REMAIN VFR, THE EXCEPTION BEING KHQM AND AREAS ALONG
THE COAST WHERE LOCALIZED MVFR CONDITIONS CAN BE POSSIBLE
THROUGHOUT THE MORNING. ELSEWHERE, VFR WILL REMAIN THROUGHOUT
THE DAY WITH SW WINDS GENERALLY 10 TO 15 KNOTS.
KSEA...VFR CONDITIONS WITH HIGH CLOUDS AROUND. CEILINGS MAY
LOWER THIS MORNING TO 5000 FEET BUT WILL REMAIN VFR.
SOUTHWESTERLY WINDS INCREASING TO 10 TO 15 KNOTS, WITH SPEEDS
DECREASING AROUND 20-22Z.
MAZURKIEWICZ
MARINE
LIGHT ONSHORE FLOW CONTINUES OVER THE WATERS WITH A SURFACE HIGH
PRESSURE OFFSHORE. A WEAK FRONT WILL CROSS OVER THE AREA WATERS
OVER THIS WEEKEND FOR AN INCREASE IN ONSHORE FLOW. SMALL CRAFT
ADVISORY STRENGTH WINDS ARE POSSIBLE THROUGHOUT THE STRAIT OF
JUAN DE FUCA DURING THE AFTERNOON AND EVENING HOURS SATURDAY AND
SUNDAY.
MAZURKIEWICZ
HYDROLOGY
THE DAILY HYDROLOGY DISCUSSION HAS ENDED UNTIL THE START OF THE NEXT
RAINY SEASON; IT WILL ONLY BE UPDATED DURING THIS TIME AS
NEEDED.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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