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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Friday
• 
• High: 61 °
• Low: 48 °
• Rain Showers

• Saturday
• 
• High: 61 °
• Low: 45 °
• Chance of Rain

• Sunday
• 
• High: 63 °
• Low: 48 °
• Chance of Rain

• Monday
• 
• High: 63 °
• Low: 52 °
• Mostly Cloudy

• Tuesday
• 
• High: 66 °
• Low: 50 °
• Overcast

Area forecast discussion 
National Weather Service Seattle Washington 
330 am PDT Thursday may 23 2013 


Synopsis...a slow moving cold upper-level low will continue to 
produce showers across the region today. The upper low will Noodle 
around the northwest into the Memorial Day weekend as it slowly 
fills and weakens. A weak frontal system will approach the region on 
Memorial Day but may shift south into Oregon. 


&& 


Short term...the closed upper level low that has been spinning over 
western Washington will shift into eastern Washington today. Models still generate 
isolated to scattered showers across the region...but precipitation amounts 
look pretty light. Probability of precipitation are highest over the coast and south part. 
The radar composite shows rain along the Washington/or border this morning. 
The threat of T-storms is low and mainly east of the crest today. 
Temperatures are still cool aloft with 500 mb temperatures in the -20s. 
Surface temperatures in the middle to upper 50s looks good...with a few low 
60s possible. 


This system will rotate north into b.C./Alberta over the weekend for 
a modest warm-up...temperatures are closer to normal. The models still show 
a weak trough over western Washington for a chance of showers...but looks 
like just isolated coverage. Snow levels will rise to 5000-6000 feet 
in the mountains. 


Models are backing off on the next incoming system slated for 
Memorial Day. The European model (ecmwf) is pushing this next system farther south 
which will mainly affect Oregon. But the 00z GFS and NAM still some 
moisture reaching the area during the day. So will stick with a 
blend for now...cloudy with a chance of rain. But if everything 
trends toward the Euro then look for a mainly dry Holiday. 


Long term...cool onshore flow will prevail through the rest of the 
week for mostly cloudy skies and temperatures near normal. Models show a 
long wave trough over the Pacific northwest for additional showers across the 
region...at least through midweek. Weak ridging may bring drier 
weather by Thursday or Friday. 33 


&& 


Aviation...an upper level trough over Washington will slowly migrate eastward 
later today and tonight. Light variable flow becoming southwesterly this 
afternoon. Moist and slightly unstable. Showers...decreasing later 
tonight. Less than a 10 percent chance of isolated thunderstorms 
this afternoon/early evening. 


Ksea...variable or north wind to 5 knots...becoming S 5 to 8 knots after 13z. 
A mix of low VFR...or MVFR during showers. Mainly VFR ceilings after 18z. 


&& 


Marine...lighter gradients and winds over the Washington waters today as 
low pressure off Astoria fills and moves inland. Weak onshore flow 
later today increases a bit tonight through the weekend. There will 
be a risk for low end small craft winds in the central/east Strait the 
next couple evenings. 


The next organized front reaches the waters on Monday with small 
craft winds probable over the coastal waters and possibly some of 
the interior waters. 


&& 


Sew watches/warnings/advisories... 
Washington...none. 
Pz...none. 


&& 


$$ 


You can see an illustrated version of the forecast discussion at 
www.Weather.Gov/Seattle/gafd/latest_webafd.Html