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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Thursday
• 
• High: 66 °
• Low: 48 °
• Rain Showers

• Friday
• 
• High: 68 °
• Low: 46 °
• Chance of Rain

• Saturday
• 
• High: 77 °
• Low: 59 °
• Chance of Rain

• Sunday
• 
• High: 72 °
• Low: 55 °
• Chance of Rain

• Monday
• 
• High: 70 °
• Low: 55 °
• Chance of Rain

Area forecast discussion 
National Weather Service Portland or 
246 am PDT Thursday Jun 20 2013 


Synopsis...persistent upper level low pressure continues to bring 
clouds and showers to southwest Washington and northwest Oregon. 
Temperatures through today will be well below normal. Showers on the 
decrease today and Friday as the upper low pushes east. Temperatures 
will climb back closer to normal Friday and Saturday with some 
relatively drier weather...but it appears an active Pacific jet 
stream will bring more wet weather Sunday into early next week. 


&& 


Short term...satellite elongated low over the pacnw extending 
offshore of Vancouver Island b.C. Water vapor loop showing two 
embedded low centers...one off the S Washington coast and the other over 
northern Idaho. Showers generally few and far between...but persist 
over the mountains. However the offshore low appears to be 
responsible for and west-east oriented band of showers extending from 
the north coast across Portland/Vancouver and vicinity into the 
Cascades. Another such band seen on satellite but not radar on the 
southern border of Lane County. Models show the offshore 
circulation weakening after 15z so will reflect this in the morning 
forecast package. 


The upper low meanders further east by Friday...but still 
remains close and broad enough to allow wraparound moisture to keep 
the shower threat going for our northern zones. Temperatures will continue 
their slow recovery to seasonal normals as the upper low finally 
tries to move across the northern rockies. However a strong Pacific 
jet will be knocking on our door by then...aiming to bring a 
prolonged period of unseasonably wet weather to the Pacific 
northwest for early next week.Weagle /mh 


Long term...Saturday night through Wednesday...the latest medium 
range model runs are showing fairly good agreement in the extended 
portion of the forecast. After a brief period of dry weather Sat...the 
models are now showing a low coming onshore Sat night into Sun 
morning. Although some model runs are keeping the best precipitation to our 
south...the ensembles solutions are showing likely probability of precipitation over much of 
our forecast area during the day sun. Then a deep closed upper level low 
is prognosticated to drop south and stall over the NE Pacific for most if not 
all of next week. The best chance for significant precipitation appears to 
be Monday night into Tuesday...when the models seem to agree that a juicy 
front will bring a slug of heavy precipitation to the region. Otherwise... 
expect that the Pacific northwest will remain in a cloudy and wet pattern 
through most of next week. Temperatures will also likely be running several 
degree below normal. Pyle 


&& 


Aviation...unstable air mass under the upper low will keep the 
weather showery today and tonight...but with predominantly VFR 
conditions. The low levels will remain moist...so the possibility of 
MVFR ceilings will persist through the morning through 19z...but 
confidence in timing and location of any such lower ceilings is low. As 
the air mass settles again tonight after 06z the possibility for 
MVFR ceilings will increase again. 


Kpdx and approaches...expect predominantly VFR conditions today into 
tonight. There is a slight chance for MVFR conditions at times... 
mainly this morning through 19z...and again after 06z tonight. 
&& 


Marine...generally quiet weather through the weekend as just weak 
systems move through. The next possibility for small craft winds 
comes with a stronger front Monday night or Tuesday. 


&& 


Pqr watches/warnings/advisories... 
or...none. 
Washington...none. 
Pz...none. 


&& 




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.