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Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Friday
• 
• High: 59 °
• Low: 48 °
• Rain Showers

• Saturday
• 
• High: 64 °
• Low: 50 °
• Chance of Rain

• Sunday
• 
• High: 66 °
• Low: 48 °
• Chance of Rain

• Monday
• 
• High: 64 °
• Low: 50 °
• Chance of Rain

• Tuesday
• 
• High: 68 °
• Low: 41 °
• Mostly Cloudy

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
858 PM PDT THU MAY 23 2013

.SYNOPSIS...AN UNSEASONABLY COLD UPPER LEVEL WAS CENTERED ALONG THE
WASHINGTON COAST THIS EVENING AND WILL MOVE INLAND AND EASTWARD
TONIGHT AND FRIDAY. THE LAST MAIN BATCH OF WRAP AROUND MOISTURE WILL
MOVE THROUGH SOUTHWEST WASHINGTON AND NORTHWEST OREGON TONIGHT AND
EARLY FRIDAY. ONE MORE SHOT WAVE ON THE BACK OR WEST SIDE OF THE LOW
WILL SWING THROUGH OUR FORECAST AREA LATER FRIDAY AND FRIDAY NIGHT TO
CONTINUE SOME SHOWERS. SOME LOWER PRESSURE WILL REMAIN OVER THE AREA
THIS WEEKEND TO KEEP A CHANCE OF SHOWERS OVER THE AREA. A COUPLE OF
SYSTEMS ARE EXPECTED NEXT WEEK FOR INCREASED PRECIPITATION CHANCES.
&&

.SHORT TERM...THE UPPER LOW THAT HAS BEEN PLAGUING THE PACIFIC
NORTHWEST THE LAST FEW DAYS WITH COPIOUS PRECIPITATION WAS CENTERED
ALONG THE CENTRAL WASHINGTON COAST THIS EVENING. THE LAST BIG SLUG OF
MOISTURE WRAPPING AROUND THE LOW WAS MOVING SLOWLY EASTWARD THROUGH
SOUTHWEST WASHINGTON AND NORTHWEST OREGON THIS EVENING ASSOCIATED
WITH A SOLID LOOKING VORT LOBE OR MAX. THE MODELS SHOW THIS SLUG OF
MOISTURE WILL MOVE EAST OF THE CASCADES BY SUNRISE ON FRIDAY. QPF AS
IT MOVES THROUGH WILL BE PRETTY SUBSTANTIAL AGAIN. ASTORIA HAD 1.15
INCHES IN THE 6 HOURS ENDING AT 5 PM...WITH ANOTHER .69 INCHES SINCE
5 PM THOUGH IT IS STARTING TO SLOW DOWN. THUS LOOK FOR HALF TO ONE
INCH AMOUNTS IN THE MOUNTAINS AS THIS FEATURE MOVES THROUGH...WITH A
HALF INCH OR SO IN THE VALLEYS.

THE MAIN LOW CIRCULATION WILL MOVE EAST FRIDAY AS THIS LAST STRONGER
VORT LOBE MOVES EAST. HOWEVER...THERE IS ONE MORE SHORT WAVE THAT
WILL SWING AROUND ON THE BACK SIDE OF THE LOW AND ACROSS THE NORTHERN
PART OF OUR FORECAST AREA LATE FRIDAY AND FRIDAY NIGHT FOR A SOME
MORE SHOWERS...BUT LESS QPF THAN THE LAST FEW NIGHTS.

THERE IS STILL SOME CYCLONIC FLOW AND ENERGY AROUND OUR AREA THIS
WEEKEND...WITH A DECENT SHORT WAVE DIGGING SOUTH SATURDAY NIGHT AND
SUNDAY TOWARD SOUTHERN OREGON. SOME MODEL DETAILS STILL ARE NOT IN
VERY GOOD AGREEMENT...BUT THE BOTTOM LINE THERE IS AT LEAST A CHANCE
OF SHOWERS MUCH OF THE WEEKEND. 

LOOKS LIKE WE MAY HAVE 2 MORE RECORD LOW MAXIMUM TEMPS TODAY AT 
ASTORIA AND HILLSBORO. THERE WILL LIKELY BE SEVERAL RECORD RAINFALL 
AMOUNTS AS WELL. TEMPS TODAY WERE A COUPLE OF DEGREES HIGHER THAN 
THOSE THURSDAY AS EXPECTED...AND SHOULD MAKE UPPER 50S TO NEAR 60 
FRIDAY AS THE AIR MASS WARMS SLIGHTLY...WITH LOWER TO MID 60S 
POSSIBLE SATURDAY. TOLLESON

.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
WESTERLY FLOW ALOFT LIKELY TO BE PERSIST THROUGH THE EARLY PART OF
THE WEEK. THIS WILL KEEP REGION UNDER A PERSISTENT CHANCE FOR RAIN AS
A SERIES OF SHORTWAVES MOVES THROUGH. THE WESTERLY FLOW OFF THE
PACIFIC WILL KEEP TEMPERATURES MODERATED...LIKELY A LITTLE BELOW
SEASONAL AVERAGES. MODELS TEND TO DIVERGE SOME LATE IN THE WEEK WITH
GFS AND CANADIAN CUTTING OFF AN UPPER LOW OFFSHORE. BOTTOM LINE
THOUGH IS FOR A CONTINUATION CHANCE OF RAIN.
&&

.AVIATION...ANOTHER ROUND OF LIGHT TO MODERATE RAIN IMPACTING THE
COAST WITH A MIX OF VFR AND MVFR CIGS/VIS. RAIN WILL EASE LATE
TONIGHT BUT MVFR CONDITIONS LIKELY HANGING AROUND THROUGH MIDDAY FRI.
FOR INLAND AREAS...MAINLY VFR EXPECTED TONIGHT WITH AREAS OF MVFR
OCCURRING MAINLY NORTH OF KSLE AS THE RAIN MOVING INLAND. OVERALL
FLIGHT CONDITIONS IMPROVING AS RAIN DECREASES AND TURNS TO SCATTERED
SHOWERS LATE FRI MORNING. CASCADES FREQUENTLY OBSCURED THROUGH
TONIGHT.

KPDX AND APPROACHES...NEXT BATCH OF RAIN SWINGING INLAND THIS EVENING
SO EXPECT MVFR CIGS AND/OR VIS AT TIME THROUGH ABOUT 12Z. CIGS
IMPROVE A BIT EARLY FRI WITH HIGHER MVFR TO LOW VFR EXPECTED.
&&

.MARINE...ALL BUOYS NOW REPORTING SEAS BETWEEN 7 AND 9 FT THIS
EVENING. SEAS WILL CONTINUE TO SUBSIDE SLOWLY OVERNIGHT AND FRI AND
REMAIN AROUND 6 FT THROUGH THE WEEKEND.

A WEAK LOW PRES CENTER OVER THE NORTH COASTAL WATERS WITH WINDS BELOW
10 KT BUT A LITTLE STRONGER PRES GRADIENT OFFSHORE AND TO THE SOUTH
WILL KEEP WINDS IN THAT AREA A LITTLE HIGHER TONIGHT. WINDS RELAX FRI
MORNING AS THE LOW PRES DISSIPATES AND HIGH PRES BUILDS FROM THE
SOUTHWEST LATER FRI.  THE NEXT SYSTEM COULD INCREASE WINDS/SEAS LATER
SUN OR MON...BUT STILL UNCERTAINTY ON THE TRACK AND STRENGTH OF THIS
SYSTEM. NO CHANGES FOR NOW...AS LOOKS TO BE DECENT POTENTIAL FOR 20
TO 25 KT SOUTHERLY WINDS WITH THAT FRONT. ROCKEY.
&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.
PZ...SMALL CRAFT ADVISORY FOR ROUGH COLUMBIA RIVER BAR FROM 3 AM 
     TO 8 AM PDT FRIDAY.

&&

$$

MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND

THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.