
Warmest night of the year so far last night with a low of only 59. Sure feels like a summer morning out there and I think I like it!
Lots of clouds out there this morning and we’ll only be partly cloudy today as the upper level low off the California coast spins the moisture up over us. Assuming we get plenty of sunbreaks between the cloud cover, we should still be able to hit 80. If it stays too solid, it might only be a 76 degree day instead.
I’m not too excited about the chance for thunderstorms later this afternoon and evening except for one spot.
Our RPM model (the only one that shows it) has shown an interaction of a northwesterly marine push this evening and the available mid-upper-level moisture right over the Portland Metro area. I couldn’t include the whole loop, but notice the 10pm forecast shows a cluster of showers/thunderstorms right overhead. They form around 7-8pm on this model and hang nearby until about midnight. There is a slow movement from NW to SE. This is about the 6th run of our model showing the same thing; we get a new 27 hour run every 3 hours. Now the WRF-GFS from the UW doesn’t show anything similar, so it might be some sort of convective feedback on the model. Either that or it’s the only one implying there will be just enough lifting with the arrival of the marine air this evening to set off a few thunderstorms or showers. Of course the fun part of weather watching/model riding will be to see what actually occurs.
Chief Meteorologist Mark Nelsen