East Wind Returns

September 22, 2006

Wow…quite a stable weather pattern on the way for the next 7 days at least!  Upper level ridge is building overhead with 500mb heights above 580dm.  Pretty good for late September.  Light onshore flow right now turns offshore by Saturday morning.  I expect maybe 2-3 millibars of easterly gradient PDX-DLS tomorrow, then an increase to 5-6 mb. Sunday morning.  So Sunday should be the gusty east wind day across the metro area, although we’ll see some tomorrow.  Not quite as strong as what we saw early in the month, but probably gusts 25-30 metro area and 40-45 at the west end of the Gorge midday Sunday.  This time the flow extends all the way offshore, so the beaches reach the 75-85 range too.  Perfect weekend out there.

Offshore flow weakends Monday-Tuesday as a strong shortwave dives into the middle of the USA, but then high pressure behind that gives us renewed east wind by Wednesday again.  So it’ll be tough to stay below 80 for daytime highs through the end of next week.  Very nice after 9 days of pretty gloomy skies.