891
FXUS66 KPQR 251724 AAA
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
1024 AM PDT FRI APR 25 2025
UPDATED SHORT TERM AND AVIATION DISCUSSION.
SYNOPSIS
WARM AND DRY WEATHER PERSIST ACROSS MOST OF THE AREA
THROUGH SATURDAY, WITH THE EXCEPTION OF COOLER AND MORE SHOWERY
CONDITIONS ALONG THE OREGON CASCADES AND INTO THE EUGENE AREA.
MILDER TEMPERATURES EXPECTED ACROSS THE AREA SUNDAY INTO EARLY
NEXT WEEK, WITH ANOTHER WARM UP LOOKING LIKELY MID TO LATE NEXT
WEEK.
SHORT TERM...NOW THROUGH SATURDAY NIGHT
AN UPPER TROUGH
CONTINUES TO PUSH INLAND TODAY PRODUCING LIGHT SHOWERS OVER THE
REGION. THUS FAR, ACCUMULATION HAS BEEN MINIMAL WITH AROUND 0.02
INCH OF RAIN IN THE SOUTHERN PORTIONS OF THE FORECAST AREA. THIS
IS MAINLY DUE TO THE PERSISTENT DRY LAYER AT THE SURFACE.
CLOUDS ARE ACCOMPANYING THIS RAIN WHICH WILL HAVE A DAMPENING
EFFECT ON TEMPERATURES. THE UPPER TROUGH WILL EVOLVE INTO A
CUTOFF LOW AS IT DROPS SOUTH TO THE VICINITY OF THE BAY AREA
THIS EVENING AND THEN MOVES ACROSS CENTRAL CA ON SATURDAY, WITH
WRAP AROUND MOISTURE ON THE NORTHERN PERIPHERY OF THE LOW
MAINTAINING A CHANCE OF SHOWERS ACROSS THE SOUTHERN EXTENT OF
OUR AREA INTO THE WEEKEND. EXPECT THE BULK OF THE SHOWER
ACTIVITY TODAY TO REMAIN FOCUSED ACROSS LANE AND LINN COUNTIES
IN CLOSER PROXIMITY TO THE LOW, BUT IT WON'T BE OUT OF THE
QUESTION TO SEE A FEW SHOWERS MAKE IT AS FAR NORTH AS A MT HOOD
TO SALEM LINE AT TIMES LATER THIS AFTERNOON INTO TONIGHT. QPF
REMAINS LIGHT AS SHOWERS WILL BE HIGH BASED AND HAVE A
SUBSTANTIAL AMOUNT OF DRY AIR TO OVERCOME IN THE LOWER LEVELS OF
THE ATMOSPHERE. THUNDER CHANCES GENERALLY REMAIN BELOW 15%
THROUGH THE PERIOD AS ABUNDANT CLOUD COVER OVER THE SOUTHERN
HALF OF THE AREA HELPS TO LIMIT INSTABILITY, BUT A FEW LIGHTNING
STRIKES WILL REMAIN POSSIBLE THIS AFTERNOON, ESPECIALLY ALONG
THE LANE COUNTY CASCADES. THE INCREASED CLOUD COVER AND SHOWER
POTENTIAL OVER LANE COUNTY WILL ALSO CONTRIBUTE TO A FAIRLY
SIZABLE TEMPERATURE GRADIENT FROM SOUTH TO NORTH TODAY, WITH THE
EUGENE AREA LIKELY TO BE IN THE LOW TO MID 60S WHILE THE
PORTLAND AREA STAYS SUNNIER AND REMAINS IN THE MID TO UPPER 70S.
TEMPERATURES WILL SLOWLY MODERATE ACROSS THE NORTH THIS
WEEKEND, WITH HIGHS IN THE PORTLAND AREA CLOSER TO 70 ON
SATURDAY AFTERNOON. -MUESSLE/CB
LONG TERM...SUNDAY THROUGH THURSDAY
SHOWER ACTIVITY FINALLY
BEGINS TO WANE ON SUNDAY AS THE UPPER LOW DEPARTS INTO THE GREAT
BASIN, WITH BROAD ONSHORE FLOW BECOMING ESTABLISHED ACROSS THE
PACIFIC NORTHWEST INTO EARLY NEXT WEEK. THIS WILL DROP
TEMPERATURES MUCH CLOSER TO SEASONAL NORMALS WITH DAYTIME HIGHS
IN THE LOW TO MID 60S SUNDAY THROUGH TUESDAY OF NEXT WEEK. A
PASSING SHORTWAVE TROUGH WILL BRING THE CHANCE FOR A FEW SHOWERS
ACROSS THE AREA LATER MONDAY INTO TUESDAY, BUT RAIN AMOUNTS
CONTINUE TO LOOK RATHER MINIMAL WITH THE POSSIBLE EXCEPTION OF
NORTHERN COASTAL AREAS. BEYOND TUESDAY, THE MAJORITY OF WPC
ENSEMBLE CLUSTERS CONTINUE TO FAVOR A RETURN OF UPPER LEVEL
RIDGING OVER THE REGION MID TO LATE NEXT WEEK, RESULTING IN
ANOTHER WARMING TREND AS DAYTIME HIGHS POTENTIALLY CLIMB BACK UP
INTO THE 70S FOR THE LATTER HALF OF NEXT WEEK. -CB
AVIATION
A BROKEN MVFR DECK HAS DEVELOPED THROUGHOUT MOST OF
THE REGION, CONSISTING OF A BROKEN MARINE CLOUD DECK AROUND
1500-2000 FT. FOR ALL INLAND TERMINALS, EXPECTING THIS CLOUD DECK
TO BREAK UP AND RETURN BACK TO SCATTERED VFR CONDITIONS AROUND
19-21Z FRI. FOR SOUTHERN COASTAL TERMINALS (KONP), EXPECTING MVFR
CLOUD COVER TO BE SOMEWHAT MORE PERSISTENT; MVFR CIGS THROUGHOUT
DAYTIME HOURS, WITH AN 80% CHANCE OF IFR CIGS DEVELOPING AFTER 03Z
SAT. IFR CIGS REMAIN THERE THROUGHOUT FRIDAY NIGHT.
A FEW WEAK SHOWERS BEGIN PUSHING IN TO THE SOUTHERNMOST TERMINALS
(KONP, KEUG) AROUND 21-23Z FRI. GENERALLY WESTERLY WINDS WITH
GUSTS UP TO 10 KTS AT ALL TERMINALS FRIDAY AFTERNOON.
PDX AND APPROACHES...MARINE CLOUDS HAVE DEVELOPED, CREATING A
BROKEN MVFR DECK AROUND 1500 FEET. EXPECTING THESE CLOUDS TO BREAK
UP AROUND 19-21Z FRI, AFTER WHICH VFR CONDITIONS EXPECTED.
NORTHWESTERLY GUSTS UP TO 10 KTS POSSIBLE FROM 1Z SAT ONWARDS,
DECREASING AGAIN GOING INTO FRIDAY NIGHT. -JLIU
MARINE
STRONG HIGH PRESSURE OFFSHORE CONTINUES TO DRIVE
NORTHERLY WINDS ACROSS THE COASTAL WATERS THIS MORNING. WINDS
WILL TREND MORE NORTH-NORTHWESTERLY THROUGH THE DAY, WITH WIND
SPEEDS INCREASING BY TONIGHT. GUSTS MAY APPROACH 25 KT BY THIS
AFTERNOON, PARTICULARLY IN THE OUTER ZONES. THIS UPTICK IN WINDS
IS COINCIDING WITH A BUILDING WESTERLY SWELL, PUSHING COMBINED
SEAS TOWARD 10 TO 11 FEET BY SATURDAY. AS A RESULT, SMALL CRAFT
ADVISORIES WILL BE IN EFFECT FOR ALL WATERS BY THIS AFTERNOON,
WITH CONDITIONS LIKELY PERSISTING THROUGH AT LEAST SATURDAY. BY
LATE SATURDAY NIGHT AND INTO SUNDAY, BOTH WINDS AND SEASONS WILL
BEGIN TO EASE AS HIGH PRESSURE WEAKENS SLIGHTLY AND MOVES INLAND.
THE START OF NEXT WEEK LOOKS TO BE RATHER QUIET, WITH SEAS AROUND
5 TO 7 FEET AND WIND GUSTS UNDER 20 KT. -HALL
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...SMALL CRAFT ADVISORY FROM 2 AM SATURDAY TO 2 AM PDT SUNDAY FOR
PZZ251>253.
SMALL CRAFT ADVISORY FROM 2 PM THIS AFTERNOON TO 2 AM PDT
SUNDAY FOR PZZ271>273.
WWW.WEATHER.GOV/PORTLAND
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSPORTLAND
X.COM/NWSPORTLAND
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