The Rose Festival started wet back on Memorial Day Weekend, but has dried out nicely the past week. We’ve only seen .01″ in Portland the past 7 days (including today). That’s the first time we’ve been this dry since late January! That’s somewhat pathetic of course; due to our consistently wet or moist spring.
The mainly dry pattern continues the next 5 days at least. There are no wet troughs swinging by until at least next Tuesday or Wednesday. The far larger forecast challenge will continue to be the constant seesaw of marine air inland. Thicker marine air surging inland means morning low clouds or morning low clouds that turn into all day clouds (like Wednesday). The upper level disturbance passing by today should bring at least 50% low cloud cover into the western Valleys for the morning, then they dissipate by afternoon. A thicker layer Saturday means a longer lasting gray in the morning. At this point the marine layer doesn’t look thick enough for drizzle in the middle of Portland; far more likely up in the foothills of the Cascades then. By Sunday it really thins out for a sunnier and warmer day, which may linger into Monday.
Models are showing a deeper upper-level trough for next Tuesday-Thursday, so definitely no significant warm up in the next week and temps will probably drop well below average by Wednesday. I’d better order more gro-therm to warm the little corn starts trying to come up!
Chief Meteorologist Mark Nelsen