Nice Weekend Ahead

June 30, 2006

Looks like a perfect early July weekend ahead.

Ridge of high pressure still centered well to our east this evening (Utah/Colorado).  Southwesterly flow between it and a trough way offshore sent a disturbance up across Oregon today.  Nice series of storms developed mainly in the Central Cascades and then again over far eastern Oregon where they are still in progress as of 8pm.

Lack of onshore flow for one day really allowed the temp to spike today.  91 at PDX gives us our 5th day above 90 already by June 30th.  In an average summer we could expect 10 90+ days from July-September.  So it’ll be interesting to see if this is a taste of the rest of summer, or just an unusually warm start.

Onshore flow is up quite a bit this evening as gradients from OTH-PDX and PDX-DLS are quite a bit stronger than Thursday evening.  This should push our temps back down 3-6 degrees tomorrow.  At least that’s the FIRST LIVE LOCAL forecast plan for now. 

As for thunderstorms, I don’t see a good trigger to give us storms anywhere west of the Cascades this weekend.  One disturbance may come through Sunday afternoon, but it’s quite similar to today’s.  I expect storms will remain over the Cascades each afternoon in south or southwesterly upper-level flow.

ALL models have a cooldown by the middle of next week.  I see that last 2 GFS runs have a sharp shortwave trough and at least a few showers Thursday/Friday.  We could use a bit of rain since it’s been 2 weeks dry at PDX.

Enjoy the long weekend…I know some of you have a 4 day weekend planned!  Mark Nelsen