328
FXUS66 KSEW 081605
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
905 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/
THE LATEST FORECAST REMAINS ON TRACK THIS MORNING WITH NO
UPDATES. A WEAK UPPER TROUGH WILL CONTINUE TO 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. A MIX OF TRANSIENT MVFR AND VFR
HAS BEEN OBSERVED SO FAR THIS MORNING. AS THE MORNING PROGRESS
CONDITIONS SHOULD TREND MORE VFR INTO THE REMAINDER OF THE DAY.
SW WINDS GENERALLY 10 TO 15 KNOTS.
KSEA...VFR CONDITIONS WITH HIGH CLOUDS AROUND. SOUTHWESTERLY WINDS
INCREASING TO 10 TO 15 KNOTS, WITH SPEEDS DECREASING AFTER 00Z,
BECOMING LIGHT OVERNIGHT.
MAZURKIEWICZ/41
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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