598
FXUS66 KSEW 260335
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
735 PM PST SUN JAN 25 2026
SYNOPSIS
UPPER LEVEL RIDGE OFFSHORE WEAKENING TONIGHT.
INCREASING CLOUDS MONDAY AS A WEAK SYSTEM MOVES THROUGH THE
RIDGE. RIDGE REBUILDING MONDAY NIGHT, MOVING INLAND TUESDAY.
SPLITTING SYSTEM ARRIVING WEDNESDAY. MORE CONSOLIDATED SYSTEMS
MOVING THROUGH WESTERN WASHINGTON AT THE END OF THE WEEK.
SHORT TERM /TODAY THROUGH TUESDAY NIGHT/
HIGH LEVEL CLOUDS
WILL CONTINUE TO FILTER IN OVERNIGHT, BUT NOT QUICKLY ENOUGH TO
PREVENT FREEZING FOG FROM FORMING ONCE AGAIN IN PLACES LIKE OLYMPIA
AND SHELTON. WILL ADD SOME PATCHY FREEZING FOG TO THE SOUTHWEST
INTERIOR AND SOUTH PUGET SOUND ZONES IN A FORECAST UPDATE, OTHERWISE
FORECAST IS ON TRACK. 27
HIGH PRESSURE IS STILL IN CONTROL FOR MORE DRY AND STABLE
CONDITIONS. WE WILL SEE INCREASING MID/HIGH LEVELS CLOUDS MOVING
ALOFT TONIGHT, DUE TO A WEAK DISTURBANCE MOVING INTO B.C. OVERNIGHT
LOWS WILL BE A FEW DEGREES WARMER AS A RESULT, HOWEVER WE WILL STILL
SEE LOWS NEAR FREEZING ACROSS THE METRO AREA. THE RIDGE AXIS WILL
SHIFT INLAND MONDAY NIGHT, THEN CROSS WESTERN WA ON TUESDAY FOR ONE
LAST DRY DAY. THE AIR MASS IS A LITTLE WARMER WITH HIGHS REACHING
THE LOWER 50S. 33
LONG TERM /WEDNESDAY THROUGH SATURDAY/
A WEAK/SPLITTING
FRONTS MOVES INLAND ON WEDNESDAY FOR A CHANCE OF RAIN.
TEMPERATURES WILL MODERATE WITH LOWS AROUND 40 AND HIGHS AROUND
50. SNOW LEVELS ARE AROUND 4,000-5,000 FT AND THE HIGHER PEAKS
AND PASSES MAY SEE A FEW INCHES OF SNOW. EAST WINDS MAY KEEP
SNOW LEVELS LOWER AT SNOQUALMIE PASS WITH LIGHT FREEZING RAIN
POSSIBLE WEDNESDAY AFTERNOON AND EVENING.
WESTERN WA REMAINS UNDER MOIST, SW FLOW MOVING THROUGH THE END
OF THE WEEK, WITH A RETURN OF LOWLAND RAIN AND MOUNTAIN SNOW.
SNOW LEVELS REMAIN HIGH, AROUND 5,000 FT, WITH MIXED PRECIP
RAIN/FREEZING RAIN/SNOW AT STEVENS PASS FRIDAY (DUE TO EAST
WINDS). WITH A MILD AIR MASS IN PLACE, TEMPERATURES ARE
TRACKING A FEW DEGREES WARMER THAN AVERAGE WITH HIGHS IN THE
LOWER TO MID 50S AND LOWS IN MID 40S. 33
AVIATION
AN UPPER LEVEL RIDGE WILL SHIFT INLAND OVERNIGHT, WITH A SECOND
RIDGE TRAILING IMMEDIATELY BEHIND. MOST TERMINALS ARE VFR THIS
EVENING, THOUGH OLM HAS ALREADY GONE DOWN FOR THE EVENING TO LIFR
AND FZFG. A BRIEF TROUGH IN BETWEEN RIDGES WILL PRODUCE HIGH CLOUDS
TONIGHT/MONDAY, THUS REDUCING PROBABILITIES FOR FOG REDEVELOPMENT
MONDAY MORNING (10% CHANCE IN THE SOUTH INTERIOR). WINDS REMAIN
LIGHT IN THE TAF PERIOD (LESS THAN 5 KT), BUT SWITCH FROM NORTH TO
SOUTH TONIGHT/MONDAY (MAY ALSO BE LIGHT AND VARIABLE AT TIMES).
KSEA...VFR THROUGH THE TAF PERIOD. CLEAR THROUGH TONIGHT WITH HIGH
CLOUDS MONDAY. WINDS LESS THAN 5 KT, WILL SWITCH FROM NORTHERLY TO
SOUTHERLY, BUT MAY BE LIGHT AND VARIABLE AT TIMES.
HPR/21
MARINE
BROAD HIGH PRESSURE ACROSS THE NORTHEAST PACIFIC WILL REMAIN IN
PLACE THROUGH THE WEEKEND WITH GENERALLY CALM WINDS. THE NEXT PERIOD
OF IMPACTFUL MARINE WEATHER DOESN'T LOOK TO ARRIVE UNTIL TUESDAY, AS
A WEAK FRONTAL SYSTEM APPROACHES THE WEST COAST AND BRINGS BACK
INCREASING SOUTHERLY WINDS THAT WILL LIKELY REACH SMALL CRAFT
ADVISORY CRITERIA ACROSS THE COASTAL WATERS. A SERIES OF SYSTEMS
THROUGH MID TO LATE WEEK WILL KEEP BREEZY WINDS IN THE FORECAST
WEDNESDAY AND BEYOND ACROSS ALL THE AREA WATERS.
SEAS 3 TO 5 FT WILL CONTINUE THIS WEEKEND, INCREASING TO THE 10-15
FT RANGE TUESDAY, GETTING AS HIGH AS 18-20 FEET ON WEDNESDAY, AND
REMAINING ELEVATED AT 9-13 FEET THROUGH THE REMAINDER OF NEXT WEEK
AS SYSTEMS CONTINUE TO TRAVERSE ACROSS THE AREA.
62/15
HYDROLOGY
A RETURN TO WETTER WEATHER OVER THE SECOND HALF OF
THE WEEK WILL FORCE RISES ON THE SKOKOMISH RIVER IN MASON
COUNTY WITH MINOR FLOODING POSSIBLE. NO RIVER FLOODING IS
ANTICIPATED ELSEWHERE OVER THE NEXT 7 DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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