Everything is proceeding according to plan for this last weekend of June. This is one of the easiest forecasts we make…heatwaves west of the Cascades involve sunshine only. But the numbers are just larger, sometimes even three digits instead of two. It’s nothing like forecast snow/wind/ice/flooding.
At 9am some foothill locations are already over 80 degrees around Estacada, Colton, & Battleground…it’s gonna get hot!
We expect a high temperature around 100 both today and tomorrow. In reality at the official observing site (PDX) it could be somewhere between 98 and 102 either day. It won’t matter, it feels the same.
The morning balloon sounding is in from Salem and it shows an 850 millibar temperature of +21 degrees C, easterly wind flow from near the surface all the way up to 7,000′, and relative humidity of only 10-25% above 2,000′. That’s some hot and dry air that will surface later this afternoon. It’ll do that because we’ve also got a 3-4 millibar easterly gradient through the Gorge and over the Cascades. East wind blew all night in Corbett and temperatures there only dropped into the upper 60s. Tonight those of you in the windy areas will remain in the 70s…like those Hawaiian trade winds.
Today is also the one day we’ll see a scorcher at the coastline. Expect highs around 90 on the north coast and well into the 80s from Newport north. Then a surging southwesterly wind arrives tonight and tomorrow morning cutting off the heat…much cooler Sunday.
Chief Meteorologist Mark Nelsen