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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Tuesday
• 
• High: 64 °
• Low: 54 °
• Chance of Rain

• Wednesday
• 
• High: 61 °
• Low: 54 °
• Chance of Rain

• Thursday
• 
• High: 59 °
• Low: 52 °
• Rain Showers

• Friday
• 
• High: 59 °
• Low: 50 °
• Mostly Cloudy

• Saturday
• 
• High: 63 °
• Low: 54 °
• Mostly Cloudy

Area forecast discussion 
National Weather Service Seattle Washington 
240 PM PDT Tuesday Jun 18 2013 


Synopsis...an upper low will bring scattered showers and a few 
thunderstorms to the region through Wednesday. Showers or rain will 
likely increase Wednesday night and Thursday. Weak high pressure 
will build into the area Friday night and Saturday. A wet weather 
pattern is likely to develop early next week. 


&& 


Short term...an upper low just off the coast will shift inland over 
the next couple of days. There will be scattered showers...mainly 
afternoon and evening with a chance of thunderstorms...mainly for the 
Cascades in the afternoon and evening hours. As the low shifts 
inland the flow aloft will back from south today to more easterly 
Thursday and there is a good chance that a soaking rain will develop 
Wednesday night or Thursday as wrap around moisture spreads into 
western Washington. Showers should decrease Thursday night and then end Friday 
morning. 


&& 


Long term...temporary high pressure will build into the area Friday 
night and Saturday. A front may reach western Washington Sat night and 
Sunday morning. There is a difference between the GFS and the European model (ecmwf) 
this weekend...if the 12z GFS is correct it will not rain 
much...mainly just on the coast and in the Olympics and that model 
showed no rain at all for a good portion of the Seattle Everett 
area. The Euro on the other hand gives much of western Washington a good 
soaking rain with most of western Washington getting at least an inch of 
rain. After that...rain is likely at times Sun night through next Tuesday as 
a new upper trough moves into the NE Pacific. 


&& 


Aviation...an upper level low will spin offshore tonight with 
southerly flow aloft over western Washington. Expect isolated to scattered 
showers across the region. Instability will peak late this afternoon 
and evening with isolated thunderstorms possible...mainly coast and 
mountains. VFR conditions will prevail...however may see patchy low 
clouds and MVFR ceilings early Wednesday morning. The upper low will shift 
inland on Wednesday with showers mainly over the Cascades. 33 


Ksea...VFR conditions will prevail tonight with southerly flow at 
the surface. Expect isolated showers in the vicinity late this 
afternoon and evening. May see patchy low clouds early Wednesday morning 
for brief MVFR conditions. 33 


&& 


Marine...a 1011 mb surface low will shift east and diminish over 
the coastal waters tonight. High pressure over the offshore waters and 
low pressure over interior b.C. Will maintain S/SW flow across western 
Washington Wednesday through Friday. The central and east Strait of Juan Delaware fuca 
may see gale force westerly winds Wednesday evening. Winds will gradually 
ease through the Strait Thursday morning. A front will approach the 
coastal waters on Saturday...moving inland Sat night. 33 


&& 


Sew watches/warnings/advisories... 
Washington...none. 
Pz...Small Craft Advisory outer coastal waters today until 5 PM 
tonight. 


&& 


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