Back up the Roller Coaster

August 24, 2006

Looks like the marine air’s influence is quickly ebbing tonight.  North Bend-Spokane pressure gradient was 11.5 mb. last night, now it’s only 4.5 mb.  Tomorrow is a northerly wind day and then a weak thermal trough develops Saturday and Sunday right over the Willamette Valley.  As I mentioned last night, not a good east wind event coming up, but just an end to the onshore flow.  So 90-92 is probably the highest we’ll see at PDX in this pattern with 850 mb. temps peaking out around +20 to +21 C.

Nice trough forecast next week looks pretty strong on the ECMWF, my model of choice lately, so I threw some showers in the forecast Wednesday-Thursday.  Showers the last 2 days of August with solid marine atmosphere should keep temps in the 60s too.

I’m off to create some weather graphics.  I noticed we’ve had quite a string of sunny weekends, so I’ll talk about that at 10pm…Mark