A Record Setting Day

September 11, 2008

Snapshot  A new record for the day here in Portland.  The easterly flow did it's trick at the Airport.  The wind did not actually surface at the ASOS location itself, but it must have been REALLY close.  850mb temp at SLE was 18.8 this afternoon, which gives us a high around 86 with no onshore/offshore component, so the 91 was way up at the top of the chart I use for forecasting temps in the warm season.  We really overachieved today.

We still have all of 1 mb. gradient from PDX-DLS through the Gorge (technically -1 I suppose).  But the flow quickly turns onshore during the day tomorrow.  I hope we don't get a surprise high of 83-85 tomorrow.  I'm anticipating a good 10 degrees of cooling…or at least that's the plan.

No changes for the long range forecast.  I notice the GFS 850mb temps for Sunday/Monday are slightly cooler, even though the 500mb heights are now higher…hmmm.  We'll see what future model runs show, but I think with the upper-level ridge directly overhead for the first time this month, we should be able to exceed today's 91 degree high.

Busy right now so I'll check out for this evening…Mark Nelsen


A Record Setting Day

September 11, 2008

Snapshot  A new record for the day here in Portland.  The easterly flow did it's trick at the Airport.  The wind did not actually surface at the ASOS location itself, but it must have been REALLY close.  850mb temp at SLE was 18.8 this afternoon, which gives us a high around 86 with no onshore/offshore component, so the 91 was way up at the top of the chart I use for forecasting temps in the warm season.  We really overachieved today.

We still have all of 1 mb. gradient from PDX-DLS through the Gorge (technically -1 I suppose).  But the flow quickly turns onshore during the day tomorrow.  I hope we don't get a surprise high of 83-85 tomorrow.  I'm anticipating a good 10 degrees of cooling…or at least that's the plan.

No changes for the long range forecast.  I notice the GFS 850mb temps for Sunday/Monday are slightly cooler, even though the 500mb heights are now higher…hmmm.  We'll see what future model runs show, but I think with the upper-level ridge directly overhead for the first time this month, we should be able to exceed today's 91 degree high.

Busy right now so I'll check out for this evening…Mark Nelsen