Tuesday: Hot Day #1

September 10, 2013

Portland hit 90 today, possibly 91, we’ll see when the climate report comes out at 7:20pm here.  The high temps are a bit different across the metro area today.

PLOT_Highs_Metro

Often on east wind days Portland and Vancouver have the warmest temps, but the easterly flow was very weak today.  Drier air from the Gorge made it just about Troutdale and down into eastern Clark County but that was it.  I see dewpoints across the rest of the metro area are sweaty for September!  Up to 63-64 at PDX.  Yuck, not exactly the Midwest or Deep South, but not the nice 45 degree dewpoints one would expect with hot weather in September here.

That may change tomorrow since models show stronger easterly flow developing overnight and into tomorrow morning.  This should push the wind into Troutdale, Gresham, Camas, and Washougal.  It should also push the drier air a little farther into the metro area.  That plus a slightly warmer atmosphere makes me think PDX will probably jump to the 94-96 range.  We left our 94 degree forecast alone…close enough.  Try to stay cool!

For those of you looking forward to the next 6 months of gray and rain, we’ve got a taste of it coming early next week.  Models are in very good agreement that a cooler than normal period begins either Sunday or Monday.  It’s going to be quite a change to go from 95 degree highs to 65 or so!

Take a look at the 12z GFS and 12z ECMWF ensemble charts, notice the plunge in temps from Saturday to Monday and the very good agreement among the ensemble members:

tseries_850t_000-360_Portland tseries_850t_000-384_Portland

Chief Meteorologist Mark Nelsen