A Bit Nippy

August 29, 2006

A chill in the air this evening after the MEGA-MARINE PUSH last night.   You know it’s cold when at 5pm on a sunny August afternoon it’s only 66 degrees in The Dalles!  Timberline Lodge at 6000′ in the Cascades dropped from 75 yesterday afternoon to foggy/cloudy/drizzly and 38 at 5pm.  What a change in 24 hours.  So we are obviously at the bottom of the temperature roller-coaster this afternoon.  We head uphill again on Thursday.
I had .12" rainfall at my home (in the perpetual rain forest again), but the next highest I found in the metro area was .10" at Eagle Creek and .04" in Beaverton.  Most spots had nothing.  A repeat is possible tomorrow morning as a secondary trough of low pressure slides through.  Our RPM model here at the station says a few weak showers may pop up over the Coast Range tomorrow afternoon and move out over the Valley.  Sounds good since it was right last time it did that (in June).  Then thats it for moisture as the trough kicks out.
As several of the "regulars" alluded to in the vigorous discussion below, clearing skies tomorrow night with building high pressure but a resident chilly airmass should give us a real taste of Fall temps by Thursday morning.   Then summer comes back big time over the weekend and next week.
Strong offshore flow develops early Friday and continues through Sunday morning.  Easterly wind will make all across the metro area (definitely a Fall pattern there too) during the day Friday and maybe all the way to the Coast.  So we’ll warm up quickly again just like last Friday’s jump from 69 to 85 in one day.
No real obvious or sharp end to the heat & warm weather is in the works next week.  Ridging hangs nearby, so the first week of school looks more like summer.
For you number freaks;  We’ve had 19 days above 90 degrees here in Portland this summer.  The all time record is 23 days back in the hot summer in 1987 (ahh, the first summer of freedom after high school).