470
FXUS66 KSEW 131736
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
1036 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
VFR CEILINGS IN PLACE ACROSS THE AREA WITH A FEW SCATTERED
SHOWERS AHEAD OF THE NEXT WEATHER SYSTEM. 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. EXPECT CEILINGS LOWERING
TO MVFR ACROSS THE NORTH DURING THIS SAME WINDOW, WITH CONDITIONS
SPREADING ACROSS THE REMAINDER OF THE AREA AFTER 12Z. SOUTHERLY
WINDS INCREASE A BIT TOWARD 10 KT AFTER 06Z TONIGHT INTO EARLY
WEDNESDAY.
KSEA...VFR CEILINGS CONTINUE INTO EARLY AFTERNOON UNDER SOLID
MID-LEVEL CLOUD DECK. LIGHT SOUTHERLY WINDS BECOME INCREASINGLY
SOUTHWEST AND INCREASE TO AROUND 7-9 KT THIS AFTERNOON AND
EVENING.
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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