249
FXUS66 KPQR 280440
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
940 PM PDT SUN APR 27 2025
UPDATED AVIATION DISCUSSION
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 SIGNIFICANT PRECIPITATION
AMOUNTS ARE NOT EXPECTED. 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 FLYING CONDITIONS LIKELY TO CONTINUE AT INLAND
TERMINALS THROUGH THE PERIOD. PERSISTENT MARINE STRATUS AT 3-5 KFT
WILL INCREASE IN COVERAGE OVERAGE OVERNIGHT AFTER 12-14Z MON,
INITIALLY AT PORTLAND-AREA TERMINALS (PDX, TTD) AND ULTIMATELY
ALONG THE WILLAMETTE VALLEY (HIO, UAO, SLE, EUG) AS A MARINE PUSH
PROGRESSES SOUTHWARD. WHILE CHANCES FOR VFR CIGS REMAIN HIGH,
45-55%, THERE REMAINS A MODERATE CHANCE, 35-45%, OF MVFR CIGS AT
2-3 KFT AT ALL INLAND TERMINALS LATE IN THE OVERNIGHT PERIOD AND
INTO MONDAY MORNING. REGARDLESS OF FLIGHT CATEGORY, LOW STRATUS
WILL PERSIST INTO EARLY MONDAY AFTERNOON, WITH CIGS LIFTING BACK
TO 4-5 KFT OR HIGHER AFTER 18-20Z MON. LIGHT WINDS OF LESS THAN 5
KT OVERNIGHT WILL INCREASE TO AROUND 5 KT OUT OF THE WEST TO
NORTHWEST AFTER 18-20Z MON.
CURRENT MVFR CONDITIONS ALONG THE COAST WITH CIGS OF 1-3 KFT WILL
CONTINUE THROUGH MUCH OF THE PERIOD, WITH HIGH CONFIDENCE IN MVFR
CIGS THROUGH 18-20Z MON. THERE IS A 10-30% CHANCE OF OCCASIONAL
IFR CIGS OR BRIEFLY LIMITED VIS WITHIN AREAS OF MIST OR DRIZZLE
OVERNIGHT, HOWEVER CONFIDENCE IS TOO LOW IN TIMING TO INCLUDE IN
TAFS. CONDITIONS MAY IMPROVE TO VFR MONDAY AFTERNOON AFTER 18-20Z,
MORE LIKELY TO THE SOUTH AT ONP, AS MARINE STRATUS LIFTS TO NEAR 3
KFT. MVFR CONDITIONS ARE OTHERWISE LIKELY TO RETURN LATE IN THE
PERIOD, AFTER 03Z TUE, WITH 30-40% CHANCES FOR LIGHT RAIN SHOWERS
AT AST. NORTHWEST WINDS OF 4-8 KT THIS EVENING WILL TURN TOWARD
THE WEST THROUGH THE PERIOD.
PDX AND APPROACHES...VFR FLYING CONDITIONS ARE LIKELY TO CONTINUE
INTO THE OVERNIGHT PERIOD WITH PERSISTENT BKN-OVC MARINE STRATUS
AT 3-5 KFT. CHANCES HAVE INCREASED SLIGHTLY TO 35-45% FOR MVFR
CIGS FROM 12-20Z MON, BUT CONFIDENCE REMAINS TOO LOW TO INCLUDE
PREVAILING MVFR IN TAF. CHANCES FOR MVFR CIGS DROP QUICKLY AFTER
20Z MON AS CIGS LIFT BACK ABOVE 4-5 KFT. THERE IS A 10-15% CHANCE
OF LIGHT RAIN SHOWERS AFTER 21Z MON, WITH NO IMPACTS CURRENTLY
EXPECTED. LIGHT WINDS OF LESS THAN 5 KT OVERNIGHT WILL INCREASE TO
AROUND 5 KT OUT OF THE NORTHWEST AFTER 18-20Z MON. -PICARD
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
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSPORTLAND
X.COM/NWSPORTLAND
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page