578
FXUS66 KSEW 130903
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
203 AM PDT TUE OCT 13 2026
SYNOPSIS
A WEATHER SYSTEM MOVING INTO BRITISH COLUMBIA WILL
BRUSH WESTERN WASHINGTON TODAY, BRINGING SHOWERS TO THE PACIFIC
COAST AND THE NORTH INTERIOR INTO WEDNESDAY. A RIDGE OF HIGH
PRESSURE WILL REBUILD OVER THE AREA THURSDAY AND FRIDAY. WARM
TEMPERATURES ARE EXPECTED THURSDAY AND FRIDAY AS OFFSHORE FLOW
DEVELOPS. A WEAK SYSTEM WILL MOVE INTO THE AREA ON SATURDAY,
FOLLOWED BY A STRONGER SYSTEM SUNDAY INTO MONDAY.
SHORT TERM /TODAY THROUGH THURSDAY/
A FRONTAL SYSTEM WILL
MOVE INTO B.C. TODAY WHILE A WEAK WARM FRONT CLIPS WESTERN WA.
THIS FRONT WILL CONTINUE TO SPREAD CLOUDS INTO THE REGION WITH
SCATTERED SHOWERS MAINLY ALONG THE COAST AND NEAR THE CANADIAN
BORDER. WITH THE INCREASE IN CLOUDS, WE'RE SEEING WARMER
TEMPERATURES THIS MORNING WITH UPPER 30S AND 40S EXPECTED.
EXPECT HIGHS IN THE 50S TO LOWER 60S.
A COLD FRONT WILL WEAKEN AS IT SHIFTS S/SE INTO WESTERN WA ON
WEDNESDAY. THE COAST, MOUNTAINS AND NORTH PART WILL SEE
ADDITIONAL SHOWERS WITH THE HIGHEST CHANCES OF SEEING WETTING
RAINS ON THE NORTH COAST.
HIGH PRESSURE WILL BUILD OVER THE REGION ON THURSDAY FOR DRY AND
WARMER CONDITIONS. EXPECT HIGHS IN THE LOWER 70S WITH 60S ALONG
THE WATER. 33
LONG TERM /THURSDAY NIGHT THROUGH MONDAY/
HIGH PRESSURE AND
OFFSHORE FLOW WILL BRING ONE MORE DRY AND MILD DAY ON FRIDAY.
TEMPERATURES IN THE INTERIOR WILL TRACK A FEW DEGREES WARMER
WITH AFTERNOON HIGHS IN THE LOWER TO MID 70S. A TROUGH WILL
BRING COOLER AND WETTER CONDITIONS MOVING INTO FRIDAY NIGHT AND
SATURDAY. A STRONGER AND WETTER PACIFIC SYSTEM WILL REACH THE
AREA SUNDAY/SUNDAY NIGHT AND INTO MONDAY. THIS SYSTEM HAS
POTENTIAL FOR STRONGER WINDS ALONG THE COAST WITH WETTING RAINS
FOR THE COAST AND MOUNTAINS. MOUNTAIN AREAS OVER 5000 FT MAY SEE
A FEW INCHES OF SNOW TOO. 33
AVIATION
CEILINGS WILL CONTINUE TO SLOWLY LOWER ACROSS
WESTERN WASHINGTON AS MID AND HIGH-LEVEL CLOUDS MOVE IN EARLY
THIS MORNING. CEILINGS WILL LIKELY REMAIN VFR ACROSS THE AREA
THROUGH MUCH OF THE DAY WITH MID-LEVEL CLOUDS IN PLACE. A FEW
SCATTERED SHOWERS/LOCALLY LOWER CEILINGS WILL BE POSSIBLE ALONG
THE NORTHWESTERN PORTIONS OF THE OLYMPIC PENINSULA THIS
AFTERNOON WITH THE BULK OF THE MOISTURE OFFSHORE. MOISTURE WILL
INCREASE THIS EVENING AND INTO EARLY WEDNESDAY MORNING AS THE
SYSTEM BRINGING THESE CLOUDS MOVES IN FROM THE NORTHWEST. BEST
CHANCES FOR SHOWERS WILL BE ACROSS THE NORTHERN TERMINALS SUCH
AS CLM AND BLI AFTER AROUND 06-12Z WED. AS SUCH, CEILINGS LOOK
TO LOWER TO MVFR AT THIS TIME. MORE WIDESPREAD MVFR CONDITIONS
SPREADING ACROSS THE AREA, INCLUDING THE SEATTLE METRO, WILL BE
MORE LIKELY AFTER AROUND 12-15Z WED.
WINDS WILL REMAIN MOSTLY LIGHT AND VARIABLE, WITH S/SW WINDS UP TO
AROUND 5-7 KT POSSIBLE THIS AFTERNOON. S WINDS LOOK TO PICK UP TO
AROUND 5-10 KT AFTER AROUND 06Z THIS EVENING.
KSEA...VFR CONDITIONS THROUGH MUCH OF THE DAY TODAY WITH INCREASING
HIGH AND MID-LEVEL CLOUDS THIS MORNING AHEAD OF A FRONTAL SYSTEM
OFFSHORE. CHANCES FOR MVFR CIGS INCREASE EARLY WEDNESDAY MORNING.
LIGHT S/SE WINDS UP TO 5-7 KT WILL TURN MORE SW THIS AFTERNOON.
62
MARINE
HIGH PRESSURE WILL SHIFT INLAND AND TO THE SOUTHEAST
AS A LOW PRESSURE SYSTEM MOVES OVER VANCOUVER ISLAND AND SLOWLY
SHIFTS TO THE SOUTH. WINDS WILL LIKELY REMAIN BELOW THRESHOLDS,
BUT SOME SLIGHT ENHANCEMENTS IN THE WIND JUST OFF THE NORTHWEST
OLYMPIC PENINSULA MAY ALLOW FOR SOME GUSTS TO REACH 15-20 KT
TUESDAY AND INTO EARLY WEDNESDAY. THE FRONTAL SYSTEM WEAKENS AS
IT MOVES INLAND ON WEDNESDAY. HIGH PRESSURE WILL THEN BUILD OVER
COASTAL WATERS WEDNESDAY NIGHT INTO THE END OF THE WEEK. WITH
THERMAL TROUGHING ALONG THE COAST, THIS WILL ALLOW FOR WINDS TO
TURN OFFSHORE WEDNESDAY NIGHT INTO THURSDAY. SOME ENHANCEMENT IN
THE WINDS WILL BE POSSIBLE IN THE GAPS IN THE TERRAIN (WEST
STRAIT OF JUAN DE FUCA, CHEHALIS GAP/GRAYS HARBOR AREA). THE
THERMAL TROUGH LOOKS TO MOVE INLAND FRIDAY, WITH ONSHORE FLOW
INCREASING FRIDAY NIGHT INTO THE WEEKEND AS A SERIES OF SYSTEMS
LOOKS TO APPROACH AND MOVE ACROSS THE COASTAL WATERS THIS
WEEKEND INTO EARLY NEXT WEEK.
SEAS WILL REMAIN AROUND 4 TO 7 FEET THROUGHOUT MUCH OF THE WEEK
BEFORE BUILDING TO 8 TO 12 THIS WEEKEND AND REMAINING ELEVATED INTO
EARLY NEXT WEEK.
62
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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