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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Saturday
• 
• High: 64 °
• Low: 48 °
• Rain Showers

• Sunday
• 
• High: 68 °
• Low: 50 °
• Partly Cloudy

• Monday
• 
• High: 66 °
• Low: 50 °
• Chance of Rain

• Tuesday
• 
• High: 64 °
• Low: 52 °
• Chance of Rain

• Wednesday
• 
• High: 63 °
• Low: 52 °
• Chance of Rain

Area forecast discussion 
National Weather Service Seattle Washington 
315 PM PDT Sat may 25 2013 


Synopsis...low pressure aloft will remain over the region through 
the middle of the upcoming week. This will keep the weather pattern 
unsettled over the area. Daytime temperatures are expected to run 
below normal. 


&& 


Short term... 
precipitation amounts over the western part of the forecast area ended up a 
little higher than predicted...with a few gauges on the olympic 
peninsula receiving close to a half inch of rain during the 12-hour 
period ending at 3 PM PDT. Up to a quarter of an inch is expected 
over the far southwest overnight. 


No major changes in the overall pattern is anticipated during this 
period. The upper low presently over the region will weaken with 
time and will exit the area by Memorial Day. Alas...another low 
pressure system will quickly follow on its heels during Memorial 
Day. This system will linger over the region through Tuesday. Expect 
unsettled conditions to persist and daytime temperatures will continue to 
run below normal. The main forecast challenge in the short term will 
be the timing and location of the main precipitation bands. 


Long term... 
this period will start off unsettled due to an upper trough remaining 
over the Pacific northwest. However...by the end of the period...the 
medium range models were generally in agreement that heights and 
thicknesses will rise during the latter part of the period. 
Therefore have shown a tend toward warmer and drier weather. Some 
moisture and instability from an upper low off to our east may wrap 
into the Cascades on Saturday for a slight risk of afternoon showers 
or thunderstorms. 


&& 


Aviation...weak upper level trough will remain over western Washington 
today with light southwesterly flow aloft and light low level flow 
as well. Air mass moist and slightly unstable. 


Ceilings expected to be mainly within VFR...ranging from 4k feet to 6k feet. 
The exception being near showers...where ceilings will lower to MVFR/IFR 
range...or around 1000 feet. There will be occasional breaks in the 
clouds...mainly east of Puget Sound sound...but these breaks will be short 
lived. 


Ksea...S wind 4 to 8 knots today...becoming light and northerly 
during the overnight. VFR ceilings expected. Showers may work their way 
into the vicinity...which may drop ceilings into MVFR conditions 
momentarily. Smr 


&& 


Marine...light gradients today and tonight as a weak surface low 
over the offshore waters slowly moves southeast and dissipates. 
Light onshore flow developing on Sunday. The next organized front 
reaches the waters on Monday with small craft winds possible over 
the coastal waters. Onshore flow pattern will resume for Tuesday and 
Wednesday. Felton/smr 


&& 


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


&& 


$$ 


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