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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Sunday
• 
• High: 57 °
• Low: 48 °
• Rain

• Monday
• 
• High: 57 °
• Low: 48 °
• Rain

• Tuesday
• 
• High: 57 °
• Low: 48 °
• Rain

• Wednesday
• 
• High: 59 °
• Low: 43 °
• Chance of Rain

• Thursday
• 
• High: 61 °
• Low: 45 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Portland or 
856 PM PDT Sat may 25 2013 


Synopsis...a Pacific weather system was along the coast this evening 
and will move across southwest Washington and northwest Oregon 
tonight and early Sunday. The associated upper trough will linger 
over the forecast area Sunday...then move east Sunday night. Another 
more vigorous Pacific front will approach the coast late Sunday night 
and sweep through the forecast area on Memorial Day Monday. The 
upper trough associated with this second front will be over the area 
Monday night...then start to move east through the day on Tuesday. 
Another Pacific system is expected to move through later Tuesday 
night and Wednesday...with unsettled weather lingering into the 
latter part of the week. There is a hint that we may dry out by next 
weekend. 
&& 


Short term... tonight through Tuesday...we have a nice little fairly 
compact comma cloud system along the coast that will move through 
southwest Washington and northwest Oregon overnight tonight.... 
spreading rain across the area. Snow levels will be relatively high 
over the Cascades. This system should bring a decent dose of rain as 
it moves through...but nothing excessive. The associated upper trough 
will linger on a negative tilt over our area much of Sunday then 
shear out to the east. 


After a lull in the precipitation much of Sunday night...the next 
occluded Pacific front will approach the coast late Sunday night and 
swing through southwest Washington and northwest Oregon on Memorial 
Day Monday. This system is a bit more organized and vigorous...and 
will give some breezy conditions to the coast with a good dose of 
rain again across the forecast area. Precipitable waters  with this system will be 
close to 1.2 inches near our coast. The gradient along the coast 
will be pretty easterly through much of the event...not opening up 
to the south until later Monday which will be th period with the 
best coastal wind. Snow levels will remain fairly high in the 
Cascades. 


The parent upper trough will elongate to the southeast again Monday 
night and Tuesday...but this will still be enough to keep some 
showers over the area. 


All in all it looks unsettled through the short term period. Tolleson 


Long term...no changes. Previous discussion follows... 
Tuesday evening through Saturday...cool and showery conditions will 
continue through much of the work week as several shortwaves wrap 
around a broad upper level trough. An upper level ridge attempts to 
build over the Pacific northwest by Friday and early next weekend. 
This should dry out the conditions over the region starting late 
Thursday night and Friday...allowing snow levels to rise and 
temperatures back near normal. Granted there have been decent model 
discrepancies concerning this potential ridging...but seems like we 
could see ridging lingering through next weekend. /27 
&& 


Aviation...VFR conditions over northern Oregon and SW Washington 
this evening will gradually lower tonight to MVFR as a weak front 
approaches the coast. Ceilings and occasionally visibilities will lower to MVFR 
range with some local IFR conditions along the coast coast by 9 or 10 
PM. MVFR ceilings and visibilities will develop over the inland valleys after 
midnight. Conditions should improve to mostly VFR by early Sun 
afternoon with patchy MVFR conditions remaining. 


Kpdx and approaches...VFR and dry until later this evening. Look for 
MVFR ceilings to develop shortly after midnight as weak frontal system 
moves inland and remain until later Sun morning or early Sunday 
afternoon. Todd 
&& 


Marine...front moving through coastal waters tonight but gradients 
will remain fairly weak. Will keep south winds 10 to 20 knots. Front 
will push onshore early sun am...with winds relaxing and becoming 
westerly. Seas mostly 5 to 7 feet though sun evening. 


Another front arrives late Sun night and Monday. Appears that solid 
small craft winds of 20 to 30 knots. Seas may briefly clip 10 feet on Monday 
due to combined seas...but drop back Monday night as wind eases. Todd 
&& 


Pqr watches/warnings/advisories... 
or...none. 
Washington...none. 
Pz...Small Craft Advisory for rough Columbia bar conditions from 
from 5 am to 9 am sun. 


&& 


$$ 


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.