356
FXUS66 KPQR 301720
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
920 AM PST SUN NOV 30 2025
SYNOPSIS
HIGH PRESSURE CONTINUES OVER THE REGION TODAY WITH
MOSTLY DRY CONDITIONS EXPECTED THROUGH MONDAY. CHILLY
TEMPERATURES EXPECTED MONDAY MORNING. A WEAK FRONT WILL BRING
CHANCES FOR LIGHT RAIN MONDAY NIGHT INTO TUESDAY. DRY AGAIN ON
WEDNESDAY. ACTIVE WEATHER RETURNS AS A SERIES OF FRONTAL SYSTEMS
BRING INCREASING CHANCES FOR RAIN LATER THURSDAY INTO SATURDAY.
SEASONABLE TEMPERATURES CONTINUE THROUGH THE WEEK.
SHORT TERM...NOW THROUGH TUESDAY NIGHT
DRY WEATHER EXPECTED
THIS SUNDAY AS HIGH PRESSURE BUILDS OVER THE REGION. CLOUDY
SKIES THIS MORNING EXPECTED TO CLEAR FROM NORTH TO SOUTH THIS
AFTERNOON, BECOMING MOSTLY SUNNY WITH SEASONABLY COOL
TEMPERATURES. MOSTLY CLEAR SKIES TONIGHT INTO EARLY MONDAY,
ALONG WITH LIGHT WINDS, WILL ALLOW FOR RADIATIONAL COOLING
OVERNIGHT. EXPECT A CHILLY MONDAY MORNING WITH LOW TEMPERATURES
FALLING INTO THE UPPER 20S TO LOWER 30S THROUGH MUCH OF THE
INLAND VALLEYS, WHILE THE OUTER RURAL AREAS HAVE THE HIGHER
PROBABILITIES OF BELOW FREEZING TEMPERATURES. LIGHT OFFSHORE
FLOW IN THE PORTLAND METRO AND ALONG THE COAST WILL LIKELY
MAINTAIN SLIGHTLY WARMER TEMPERATURES, WITH LOWS IN THE MID TO
UPPER 30S. DRY CONDITIONS CONTINUE MONDAY, THOUGH AS THE UPPER
RIDGE SHIFTS EAST, CLOUDS FILL IN MONDAY AFTERNOON AS A
SHORTWAVE TROUGH APPROACHES THE REGION. A WEAK FRONTAL SYSTEM
MOVES OVER THE AREA MONDAY NIGHT INTO TUESDAY BRINGING ANOTHER
ROUND OF LIGHT PRECIPITATION. BUT, RAINFALL AMOUNTS AGAIN HAVE
BEEN TRENDING LOWER WITH A FEW HUNDREDTHS OF AN INCH, UP TO A
TENTH OF AN INCH, LIKELY. HIGHEST ACCUMULATIONS EXPECTED ALONG
THE NORTHERN COAST AND HIGHER TERRAIN. NO IMPACTFUL WEATHER
EXPECTED. /DH
LONG TERM...WEDNESDAY THROUGH SATURDAY
MODELS AND THEIR
ENSEMBLES REMAIN IN GOOD AGREEMENT THAT AN UPPER LEVEL RIDGE
REBUILDS OVER THE EASTERN PACIFIC ON WEDNESDAY. THIS WILL
MAINTAIN DRY CONDITIONS THROUGH AT LEAST WEDNESDAY NIGHT. THEN,
PRECIPITATION CHANCES INCREASE LATE THURSDAY THROUGH SATURDAY AS
ENSEMBLE CLUSTERS ARE INDICATING HIGH CHANCES OF THE RIDGE
FLATTENING OUT, ALLOWING FOR NORTHERLY WEATHER SYSTEMS TO PUSH
INTO THE PACIFIC NW. WHILE THIS PATTERN CHANGE TO MORE WET
WEATHER APPEARS LIKELY, THERE IS FAIRLY HIGH CONFIDENCE THAT
RAINFALL AMOUNTS ARE NOT EXPECTED TO BE TOO IMPACTFUL. SNOW
LEVELS ARE ALSO EXPECTED TO START OUT RELATIVELY HIGH AROUND
6,000-7,000 FT BEFORE GRADUALLY FALLING TO AROUND 5000 FT LATER
SATURDAY. CONCERNS FOR SNOW AT PASS LEVELS REMAINS LOW. /DH
AVIATION
HIGH PRESSURE BUILDING OFFSHORE WILL MAINTAIN LARGELY
VFR CONDITIONS THROUGH THE PERIOD. LOW STRATUS OVER THE CENTRAL
AND SOUTHERN WILLAMETTE VALLEY AS WELL AS PORTIONS OF THE LOWER
COLUMBIA VALLEY WILL MIX OUT BY 21Z SUN, YIELDING VFR CONDITIONS.
WINDS AROUND 5 KT WILL CONTINUE OUT OF THE EAST TO NORTHEAST FOR
MOST, WITH NORTHERLY FLOW EXPECTED INSTEAD ALONG THE WILLAMETTE
VALLEY. SOME GUSTS OF 15-20 KT ARE STILL POSSIBLE TO THE WEST OF
TERRAIN GAPS, MOST NOTABLY INCLUDING KTTD, INTO THIS AFTERNOON
BEFORE THE OFFSHORE WIND GRADIENT BEGINS TO WEAKEN.
KPDX AND APPROACHES...VFR CONDITIONS EXPECTED THROUGH THE PERIOD
WITH FEW-SCT LOW CLOUDS AT 3-5 KFT AND SCT HIGH CIRRUS CLOUDS AT
OR ABOVE 25 KFT. LIGHT WINDS AROUND 5 KT LARGELY OUT OF THE EAST
TO NORTHEAST EXPECTED THROUGH THE PERIOD. -36
MARINE
BENIGN WEATHER CONTINUES ACROSS THE COASTAL WATERS AS
WEAK LOW PRESSURE DISSIPATES NEAR THE COAST TODAY. LIGHT
OFFSHORE FLOW TURNS NORTHERLY AS HIGH PRESSURE BUILDS OFFSHORE
LATER TODAY THROUGH MONDAY. WINDS REMAIN 15 KT OR LESS WHILE
SEAS HOLD FAIRLY STEADY AROUND 4 TO 8 FT. A WEAK FRONT WILL PUSH
ACROSS THE WATERS LATE MONDAY NIGHT INTO TUESDAY BRINGING
NORTHWEST WINDS OF AROUND 15-20 KT, WHILE A LONG PERIOD WESTERLY
SWELL WILL BUILD SEAS TOWARD 10 FT ON TUESDAY. WINDS AND SEAS
THEN EASE MIDWEEK WITH ANOTHER WEATHER SYSTEM POTENTIALLY
ARRIVING LATE IN THE WEEK. /DH
BEACH HAZARDS
A LONG-PERIOD WESTERLY SWELL IS EXPECTED ALONG
THE NORTHWESTERN OREGON AND SOUTHWESTERN WASHINGTON COASTS FROM
LATE MONDAY THROUGH WEDNESDAY NEXT WEEK. WAVE HEIGHTS
INCREASING TO 8 TO 10 FT ON TUESDAY MAY NOT APPEAR TO PRESENT A
SAFETY RISK TO THOSE ON AREA BEACHES, BUT THESE ENERGETIC WAVES
WILL PRESENT A MODERATE TO HIGH RISK FOR SNEAKER WAVES, WAVES
WHICH CAN RUN SIGNIFICANTLY FARTHER UP A BEACH THAN NORMAL,
INCLUDING OVER ROCKS AND JETTIES. IN ADDITION, A PERIOD OF
PERIGEAN SPRING OR "KING" TIDES MEANS THESE WAVES WILL HAVE AN
EVEN EASIER TIME REACHING HIGH UP ONTO BEACHES, LIMITING THE
AREAS WHICH MAY BE SAFE FROM WAVE ACTION.
A BEACH HAZARDS STATEMENT HAS THEREFORE BEEN ISSUED FROM 7 AM
TUESDAY TO 10 PM WEDNESDAY. SNEAKER WAVES CAN CREATE POTENTIALLY
LIFE-THREATENING CONDITIONS IN THE SURF ZONE WHEN BEACHGOERS CAN
BE UNEXPECTEDLY KNOCKED OFF THEIR FEET AND PULLED OUT INTO COLD
OCEAN WATERS. CAUTION SHOULD BE USED WHEN IN OR NEAR THE WATER,
AND THOSE WITH CHILDREN SHOULD BE ESPECIALLY WATCHFUL. NEVER TURN
YOUR BACK ON THE OCEAN, AND BE SURE TO KEEP AN EYE ON THE WAVES.
THOSE PARTICIPATING IN RAZOR CLAM DIGS SHOULD ADDITIONALLY
EXERCISE CAUTION. -36
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...NONE.
WWW.WEATHER.GOV/PORTLAND
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