352
FXUS66 KSEW 191522
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
822 AM PDT MON OCT 19 2026
SYNOPSIS
SHORT TERM /TODAY THROUGH WEDNESDAY/
LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/
AVIATION
SOUTHWESTERLY FLOW ALOFT IS EXPECTED TODAY AS AN
UPPER TROUGH DIGS SOUTHWARD OFFSHORE. FLOW ALOFT THEN TURN MORE
VARIABLE INTO EARLY TUESDAY. MID TO HIGH LEVEL CLOUDS THIS
MORNING IS LIMITING AREAL COVERAGE OF LOW CLOUDS AND FOG WITH
THE EXCEPTION OF MORE FOG PRONE LOCATIONS IN THE SOUTHWEST
INTERIOR, SOME RIVER VALLEYS, AND EXTREME SOUTHERN PUGET SOUND
FOR THE POTENTIAL OF IFR/LIFR CONDITIONS. IMPACTED TERMINALS
EXPECTED TO IMPROVE BY 18Z FOR WIDESPREAD VFR CONDITIONS. WINDS
WILL SHIFT MORE SOUTHERLY MONDAY MORNING THEN TRANSITION BACK
NORTHERLY IN THE EVENING. MORE WIDESPREAD LOW CLOUDS/FOG A
POSSIBILITY LATE TONIGHT INTO TUESDAY MORNING.
KSEA...CONFIDENCE LEANS TOWARD VFR CONDITIONS CONTINUING TODAY. MID-
HIGH CLOUDS OVERHEAD SHOULD LIMIT FOG DEVELOPMENT THIS MORNING.
SURFACE WINDS LIGHT THIS MORNING. WINDS WILL SHIFT MORE
NORTHWESTERLY AFTER 19Z-21Z AT 5-8 KT AND REMAINING INTO THE
EVENING. 33/41
MARINE
A LOW PRESSURE SYSTEM PASSING SOUTHWARD WELL OFFSHORE
WILL KEEP WINDS NORTHERLY OR WEAKLY OFFSHORE FOR TODAY. WEAK
HIGH PRESSURE WILL REMAIN ACROSS THE WATERS INTO THE MIDDLE OF
THE WEEK FOR A PERIOD OF BENIGN CONDITIONS. A LARGER SWELL TRAIN
NEAR 10-12 FEET GENERATED BY ACTIVE WEATHER WELL OFFSHORE IS
EXPECTED TO REACH THE COASTAL WATERS AROUND THURSDAY ALONG WITH
AN INCREASE IN ONSHORE FLOW. A FRONT MAY REACH THE WATERS TOWARD
THE END OF THE WEEK BUT MUCH UNCERTAINLY EXISTS IN REGARDS TO
CURRENT TRACK AND INTENSITY.
41
HYDROLOGY
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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