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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

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

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

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

• Tuesday
• 
• High: 68 °
• Low: 52 °
• Chance of Rain

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

Area forecast discussion 
National Weather Service Seattle Washington 
330 am PDT Sat may 25 2013 


Synopsis...a weakening low pressure system will remain over the 
region through this weekend but there will be a trend toward less 
showers...more sunshine...and warmer afternoon temperatures. A weak 
system may lift north through western Washington on Memorial Day. 
Rain will increase from south to north during the afternoon and 
evening. Expect scattered showers and cooler weather through at 
least midweek. 


&& 


Short term...western Washington is still under the influence of the 
spiraling upper level low that has been over the region for the 
past several days. The main low center is over southern 
Alberta...but it looks like there is a second /weaker/ center over 
Washington. As a result...we will continue to see isolated to scattered 
showers across the region today. Probability of precipitation are highest over the southern 
portion of the County Warning Area /where the flow is westerly/. Temperatures are rather 
tricky under this pattern. A few sunbreaks and we will see lower 60s 
but areas stuck under the clouds will remain in the 50s. This 
secondary vorticity lobe over Washington will maintain a chance of showers across 
the region tonight. 


Showers will decrease on Sunday as the broad upper level low finally 
exits to the east. Showers will mainly affect the mountains and 
south part during the morning and early afternoon. But as we head 
into the late afternoon and evening hours we should see showers 
diminishing across the board. 


Models are still waffling with the strength and timing of the next 
system slated for Memorial Day. It now looks like this system 
will lift north through Oregon during the morning...with rain 
reaching the coast and south part of the County Warning Area during the afternoon. 
The upper level trough will then cross through western Washington during the 
evening for an increasing chance of showers. This system does weaken 
as it moves inland so will still stick with lower probability of precipitation. Model quantitative precipitation forecast is 
up to one quarter of an inch for the coast and south part...with 
only a few hundredths Seattle northward. 33 


Long term...models continue the trend of cool and showery weather 
across western Washington through at least the middle of next week. Wednesday may 
be the wettest day as a negative tilt trough axis lifts north 
through the state. But the models are advertising a break in the 
action starting Thursday as a broad upper level ridge over the NE 
Pacific nudges inland. This pattern may continue on Friday and into the 
weekend. So if this holds then look for drier weather throughout 
this period. 33 


&& 


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


In general...ceilings in the 4000 to 6000 foot range with ceilings 
as low as 1500 feet near showers. Some brief scattering out of the 
cloud deck possible throughout the day. 


Ksea...S wind 4 to 8 knots today. VFR ceilings expected...dropping to 
MVFR briefly during showers. Felton 


&& 


Marine...light gradients today as a weak surface low over the 
offshore waters 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 


&& 


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