A Hot September Day

September 29, 2008

Snapshot  A scorcher today, by late September standards at least.  Vancouver, McMinnville, and Scappoose all made it to 92 degrees.  Areas exposed to the strongest of the east wind only made it into the mid 80s, so you can get too much of that warm easterly wind this time of year.  Too much mixing isn't always a good thing when you want to break a record.  We only tied the record of 89 degrees at PDX instead of hitting 90 for one last time this season.  BUT, it does feel good that the majority of us hit 90, there were a few doubters the middle of last week! 

One other thing was the warm overnight temps last night.  The easterly PDX-DLS gradient peaked out at 7 millibars this morning, keeping the wind blowing all last night in areas near the Gorge.  Troutdale had a low of 67 degrees overnight, and at 10pm the wind is still going strong, so I doubt it'll drop off before midnight.  If so, that's a record warm low for the day.  It'll also be the latest in Fall that TTD has stayed above 65 degrees.

I really screwed up the Coastal forecast today (that gives me 1-1 Chucky D!).  Easterly flow was still going at Newport at daybreak…temps had stayed around or above 70 most of the night, but a switch to SW wind around 7am meant the temp never climbed above 60 the rest of the day…too cool isn't it?  That cool southerly surge reached Astoria by midday, keeping temps there from getting much above 80 degrees.

This evening we've had some instability moving overhead, causing a freak out in the control room when the person driving the convertible suddenly had to go outside and raise it.  There were never any cloud to ground strikes and no precipitation was recorded at any official sites.  Looks like that was it for the next few hours, although another surge is in south-central Oregon right now.

Models are definitely converging on a rainy and windy period (real Fall weather) beginning Thursday and continuing through the early part of next week.  Of course each model run and each model itself has a different solution for surface low movement and cold front passage timing, so details are up in the air.  It's going to get quite wet for sure, hopefully enough to allow open burning again…I've got a big pile of brush, and last winter's Christmas tree, under a tarp ready to go.  Is that a bit trashy?  Not sure, but the needles are all gone…Mark Nelsen