Just a quick note to let you know I didn’t disappear on vacation. I’m back for today and Saturday and then all of next week too.
First, remember that today is one of the 3 days in Portland’s history that we made it to our all time record high. During a heat wave in 1981 we hit 107 TWICE! That sandwiched a 105 degree day. I’m not aware of any hotter 3 days in Portland’s historical record.
We don’t have temps that hot on the way, but the heat is definitely turning up Sunday and Monday. We may get quite close to 100 degrees again for just the 2nd time this summer on Monday. That’s because the onshore flow we’ve seen all week will switch to a light OFFSHORE wind Sunday and Monday. At the same time upper-level ridging builds overhead pushing 850mb temperatures up to around +24 or +25 by Monday. Those two combined have given us 100 degree temperatures in the past at this time of year.
A real wildcard Monday is cloud cover as an upper-level low to the south pushes moisture up over us. Obviously this is a thunderstorm pattern too. So expect warmer nights and humid weather for awhile starting Sunday night.
Chief Meteorologist Mark Nelsen