FastCast—Tuesday, Jan. 18 to Tuesday, Jan. 25:
After a few calm & foggy days, a return to showery and cloudy weather is expected. A weak system will bring showers to the region from Monday night to Tuesday morning. Only light rain is possible. A system with a stronger cold front and potential convergence zone will move through from Wednesday to Thursday, with 0.3-0.75 inches of rain in the lowlands and 2-8 inches of snow at the passes. Expect high temperatures to be in the mid to upper 40s, with lows in the low 40s. A significant pattern change arrives on Friday. A massive ridge of high pressure (see below for more details) will build up near Vancouver Island. This ridge will bring at least 5 days of partly-mostly sunny conditions with possible morning fog. Highs will be in the upper 40s to low 50s, with lows in the mid 30s. This ridge will be in place from Friday to at least next Tuesday, likely longer.
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A return to showery and cloudy conditions is expected by Tuesday. A weak system will being up to 0.2” of light rain to the region (potentially more on the coast/North Sound and in the mountains).
Another system, this one stronger, will arrive midday Wednesday through Thursday, bringing 0.3-0.75” of rain and 2-8 inches of snow at the passes. More snow is possible in Convergence Zone banding in the Central Cascades on Thursday.
The European model shows total rain through Thursday evening.
Expect 0.4-0.8 inches of rain in the lowlands by Thursday, with more (0.9-1.5”) on the coast and north of Everett. Snow levels will be on the higher side (4,000-5,500 feet) this week, so 1-3 inches of rain are possible in the mountains as well.
However, above 4,000-5,500 feet, 2-12 inches of snow are expected, most above 6,000 feet.
As the system moves out on Thursday night, a massive ridge of high pressure will build off the coast, bringing at least 5 days of calm weather and partly-mostly sunny conditions.
Below is the European model forecast for air pressure “height” anomalies at 18,000 feet (500 mb) on Saturday.
You can see the massive ridge centered over Northern Vancouver Island. This will deflect any weather from our area and bring consistent partly-mostly sunny conditions and highs in the upper 40s to low 50s. Lows will be in the mid 30s, with morning fog possible. This ridge will begin building on Friday, staying in place through at least next Tuesday.
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