Briefly Warmer

June 18, 2007

SnapshotWell, apparently we will not see an early start to warm and dry summer weather this year as we did last summer.  You may remember, as shown on the left, that we went warm and dry after mid-June, and serious Fall rain didn’t arrive until right after Halloween.  It was a long & dry summer.  BUT, that was an anomaly.  This June is looking pretty darn average.  In fact the PDX temperature is running just about average for the month so far and rainfall is actually slightly BELOW normal.  We’ve just had lots of dribbles of rain, making it seem wetter.
Well, a brief break for Tuesday and Wednesday as a transient ridge of upper-level high pressure moves overhead.  That weakens the onshore flow quite a bit AND gives us much warmer air up above as well.  With strong June sunshine, temperatures rebound nicely.  Then what appears to be a very persistent upper-level trough offshore pushes closer and closer Thursday-Saturday.  That first sends in a push of marine air and clouds Thursday, possibly with showers.  Then cooler air and a better chance for showers arrives Saturday and Sunday.  So it’s back to the cloudier and cooler weather after Thursday.
Long range maps (GFS & ECMWF) show much stronger ridging beginning Monday and into next week, but they are already backing off on that, so no need to raise temps in the 7 Day much…for now.  So, I have covered my "warm weather" veggies with heat-holding plastic tunnels and applied slug bait all over the garden too.  Mark