textproduct: Seattle/Tacoma
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/
Onshore flow continues across Western Washington late Wednesday into Thursday with temperatures returning closer to seasonal normals. Latest ensemble guidance continues to consistently bring the next deeper upper level trough into the region later in the week and into the weekend. This will maintain continued cooler and cloudier conditions, along with rain chances at times. As the core of the cooler temperatures aloft pass overhead on Saturday, we will see around a 15% chance of an isolated thunderstorm or two across much of the area.
AVIATION
Northerly flow aloft continues with an upper level ridge just offshore. VFR conditions prevail through the TAF period. Mostly clear skies continue this morning, with high clouds moving in this afternoon. Light NE to calm winds will become more N/NW during the day, up to around 5 to 10 kt. Winds transition to more NE/E tonight, after 06Z Tue.
KSEA...VFR conditions prevail through the period with increasing high clouds this afternoon. NE winds 6 to 10 kt becoming more NW after 18Z, up to 8 to 12 kt with occasional gusts 18-20 kt this afternoon. Winds ease but become more NE to E tonight.
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MARINE
High pressure will begin to weaken over the coastal waters as a weak thermal trough develops and works up along the coastline. Winds will remain north/northwest today, but will briefly switch to easterly overnight along the coast and through the Strait. The thermal trough then gets forced inland Tuesday by an incoming system, allowing winds to return to northwesterly during the day Tuesday.
A weak front will traverse the area waters on Wednesday, allowing for stronger onshore flow. High pressure will return in its wake, allowing for enhanced wind through the Strait of Juan de Fuca beginning Wednesday. An extended period, through late week, of Small Craft Advisory winds is likely. There also remains a 40-70% chance for gale force gusts on Thursday evening. Winds will slowly ease over the weekend as a broad low pressure system moves through the area waters.
Seas generally remain in the 4 to 7 ft range through the week.
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SEW WATCHES/WARNINGS/ADVISORIES
WA...None. PZ...None.
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