637
FXUS66 KPQR 272135
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
235 PM PDT SUN APR 27 2025
SYNOPSIS
COOLER AND DRIER ACROSS THE AREA TODAY IN THE WAKE
OF A DEPARTING SYSTEM OVER CALIFORNIA. ONSHORE FLOW BRINGS
BENIGN CONDITIONS AND SEASONABLE TEMPERATURES THROUGH THE START
OF THE WEEK. A PASSING FRONT WILL BRING A CHANCE FOR RAIN ACROSS
THE AREA MONDAY NIGHT INTO TUESDAY, BUT DO NOT EXPECT ANY
SIGNIFICANT PRECIPITATION AMOUNTS. WEATHER BRIEFLY TURNS WARMER
AND DRIER AGAIN WEDNESDAY AND THURSDAY BEFORE ANOTHER SYSTEM
RETURNS COOLER AND CLOUDIER CONDITIONS TO THE REGION LATE NEXT
WEEK.
SHORT TERM...NOW THROUGH TUESDAY NIGHT
STRENGTHENING ONSHORE FLOW
BRINGING COOLER TEMPERATURES AND CLOUDIER CONDITIONS FOR THE NEXT FEW
DAYS. WESTERLY WINDS THROUGH THE COLUMBIA RIVER GORGE TODAY WILL BE
ELEVATED, WITH TOP GUSTS UP TO 25-30 MPH. WINDS DECREASE AROUND THE
MIDDLE OF TONIGHT (SUNDAY NIGHT), AND WILL BE SLIGHTLY MORE MILD FOR
A FEW DAYS. VERY WEAK SHORTWAVE RIDGING THROUGH MONDAY DAYTIME HOURS,
WITH LOWLAND TEMPERATURES AROUND THE LOW TO MID 60S SUNDAY AND MONDAY
AFTERNOON. CLOSER TO LOW TO MID 50S AT THE COAST. A VERY WEAK
EMBEDDED SHORTWAVE PUSHES INTO THE REGION ON MONDAY AFTERNOON/NIGHT,
BUT RAINFALL ACCUMULATION LOOKS FAIRLY MINIMAL. THIS TROUGH
WILL BE AIMED SLIGHTLY FURTHER NORTH IN WASHINGTON, AND AREAS
NORTH OF PORTLAND SEE AROUND A 40-70% CHANCE OF EXCEEDING 0.10
INCHES OF RAINFALL BETWEEN 5PM MON TO 5PM TUE. SLIGHTLY HIGHER
ACCUMULATIONS IN THE WILLAPA HILLS, NORTHERN COAST RANGE, AND
SOUTHERN WA/NORTHERN OR CASCADES, WITH TOTALS CLOSER TO 0.3-0.5
INCHES OF RAIN DURING THIS TIME. TUESDAY MORNING SEES RAIN
TAPERING OFF THROUGHOUT THE REGION, AND SEASONABLE TEMPERATURES.
/JLIU
LONG TERM...WEDNESDAY THROUGH SATURDAY
WARMER AND DRYER
WEATHER RETURNS TO THE REGION ON WEDNESDAY AS A RIDGE OF HIGH
PRESSURE BUILDS OVERHEAD AND SENDS TEMPERATURES BACK INTO THE
70S IN THE INTERIOR LOWLANDS. LATEST GUIDANCE CONTINUES TO
SUGGEST THURSDAY WILL BE THE HOTTEST DAY OF THE WEEK, WITH THE
NBM INDICATING AN 80-90% PROBABILITY TO REACH 80 DEGREES IN THE
PORTLAND METRO AND A 40-60% CHANCE ACROSS THE REST OF THE
INTERIOR VALLEY LOCATIONS. COASTAL LOCATIONS WILL NOTABLY REMAIN
COOLER AS MARINE LAYER INFLUENCES HOLD TEMPERATURES IN THOSE
LOCATIONS DOWN IN THE 60S. THE PERIOD OF WARM WEATHER WILL BE
RELATIVELY SHORT LIVED AS WPC ENSEMBLES CLUSTERS SHOW GOOD
AGREEMENT IN THE RIDGE SHIFTING EAST BY FRIDAY AND OPENING THE
DOOR FOR THE NEXT UPPER LEVEL TROUGH APPROACHING THE REGION.
THIS WILL BRING ANOTHER ROUND OF COOLER AND WETTER WEATHER TO
THE AREA FROM FRIDAY INTO NEXT WEEKEND. /CB
AVIATION
VFR CONDITIONS EXPECTED INLAND WITH A CLOUD DECK
REMAINING AROUND 3-4.5 KFT INTO THE EVENING. LIGHT WESTERLY WINDS
AROUND 5 KT ARE EXPECTED INLAND. CONFIDENCE IS HIGH IN ANOTHER
MARINE PUSH INLAND TONIGHT BUT CONFIDENCE IS LOW IN WHETHER IT
WILL BRING MVFR CIGS OR JUST LOW END VFR. MODEL SOUNDS SHOW LOW
LEVELS BECOMING SATURATED LATE TONIGHT BUT DISAGREE ON WHERE
EXACTLY THE DECK WILL FORM. IN GENERAL, IT COULD BE BETWEEN 2-5
KFT BUT CONFIDENCE REMAINS LOW.
MIX OF MVFR AND VFR CONDITIONS ALONG THE COAST. KAST IS EXPECTED
TO REMAIN MVFR WITH PROBS GREATER THAN 70% THROUGH TONIGHT. KONP
IS CURRENTLY VFR AND SHOULD STAY THAT WAY INTO THE EVENING BEFORE
ANOTHER MARINE LAYER DEVELOPS THIS EVENING. WINDS W/NW AT 5-10 KT
EXPECTED.
PDX AND APPROACHES...EXPECT MOSTLY VFR CONDITIONS THROUGH THE TAF
PERIOD. COULD SEE ANOTHER MARINE PUSH OVERNIGHT BUT CONFIDENCE IS
LOW IN WHETHER THIS WILL BE MVFR OR LOW END VFR CIGS. WINDS
SOUTHERLY AROUND 5 KT, TURNING WEST THIS EVENING. -BATZ
MARINE
HIGH PRESSURE OVER THE NORTHEAST PACIFIC CONTINUES TO SHIFT
INLAND, SUPPORTING BENIGN CONDITIONS INTO NEXT WEEK. EXPECT SEAS
AROUND 5 TO 7 FEET AND MOSTLY NORTHWESTERLY WINDS AT OR BELOW 10
KT AND GUST 15 KT OR LESS.
A SHORT SMALL CRAFT ADVISORY FOR THE COLUMBIA RIVER BAR HAS BEEN
ISSUED FOR STEEP EBB CHOP AND WILL COME TO END BY 8 AM MONDAY.
EBB CURRENT OF 7.35 KT AND SEAS 7 TO 8 FEET EXPECTED. -BATZ
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...SMALL CRAFT ADVISORY FROM 2 AM TO 8 AM PDT MONDAY FOR
PZZ210.
WWW.WEATHER.GOV/PORTLAND
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