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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Wednesday
• 
• High: 66 °
• Low: 54 °
• Chance of Rain

• Thursday
• 
• High: 57 °
• Low: 52 °
• Rain Showers

• Friday
• 
• High: 61 °
• Low: 52 °
• Chance of Rain

• Saturday
• 
• High: 73 °
• Low: 54 °
• Partly Cloudy

• Sunday
• 
• High: 73 °
• Low: 57 °
• Chance of Rain

Area forecast discussion 
National Weather Service Seattle Washington 
845 am PDT Wednesday Jun 19 2013 


Synopsis...an upper level low is over the Pacific northwest. 
Scattered showers will increase through Thursday...especially north 
of Seattle and in the Cascades. Weak high pressure will build into 
the area Friday night and Saturday. A series of fronts will bring 
wet weather again early next week. 


&& 


Short term...the flow aloft has backed to more easterly as the 
upper low center shifts over Oregon today. Some showers have pushed 
westward across the Cascades...mainly north of Seattle. At 9am this 
morning skies across western Washington range from sunny on the coast to 
cloudy inland...but some cumulus will likely lift up and fill in the 
coastal areas with a chance of showers this afternoon...and the 
cloudy areas inland will probably see some sunbreaks this afternoon. 
The best chance of showers will probably remain north and east of 
Seattle in the more southeast or easterly flow north of the low 
center...and there is a good chance that the showers will increase 
by Thursday. There will probably be a good soaking rain in the north 
Cascades. The low will shift inland Friday and weak high pressure 
will build in to the area. 


&& 


Long term...Saturday looks and will likely be the warmest day of 
the week with highs in the 70s many areas as a short wave upper 
ridge moves overhead. A frontal system will be approaching from the 
west Saturday night and Sunday. Models are having a hard time 
agreeing on when this system will make landfall and there has been a 
fair amount of run to run waffling as well. If the GFS is correct... 
most of the area will remain dry and highs will be similar to 
Saturday. If the European model (ecmwf) is correct...it will be a rainy and cooler 
day with highs in the 60s. Another relatively wet front will move 
onshore around Monday night. Confidence in the timing and other 
specifics with this front is low for now. Schneider 


&& 


Aviation...upper level low off the South Washington coast is 
forecast to move southeast into northwest Oregon by this afternoon and across 
northern Oregon tonight into Thursday. Flow aloft becoming more 
easterly across Washington as the low moves inland. Air mass 
unstable and becoming more moist into Thursday. Low level onshore 
flow to increase through Thursday. 


Doppler weather radar shows increasing showers moving west into the 
central and northern Puget Sound sound area this morning. Ceilings in this 
region have fallen into the MVFR category. Ceilings elsewhere remain 
VFR. There may be some improvement in ceilings in the MVFR areas as 
the day wears on...but likely see ceilings lower elsewhere as move 
cloud cover and showers move west around the upper low. 


Ksea...MVFR ceiling likely to lift some - 2500-3500 feet - by 19z or 
so but also some showers to move in from the east by 20z. Southerly 
winds 4 to 8 knots becoming SW 6 to 10 knots this afternoon. Buehner 


&& 


Marine...a weak 1013 mb low just off Willapa Bay is forecast to 
shift inland to eastern Washington by tonight. Higher pressure over the 
offshore waters will build a bit with increasing low level onshore 
flow into western Washington tonight and continuing into Thursday. 


A Gale Warning is in place for the central and eastern Strait of 
Juan Delaware fuca for tonight with a Small Craft Advisory in effect until 
then. In addition a Small Craft Advisory remains for the northern 
inland waters. Winds easing later Thursday as surface high pressure 
begins to build into the area and pressures rise over British 
Columbia. High pressure over the waters on Friday. A front will 
approach the coastal waters on Saturday and move inland on Sunday. 
Buehner 


&& 


Sew watches/warnings/advisories... 
Washington...none. 
Pz...Gale Warning central and eastern Strait. 
Small Craft Advisory northern inland waters. 


&& 


$$ 


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