High pressure will be building over the Southwest which in the past has lead to a heat wave across western states, but the Pacific Northwest will not be joining in the warm-up this week as a trough will move in this week. This trough will pinch the ridge, keeping it further east along with the hotter temperatures. This week seasonable temperatures will be with us and calmer, warm and dry weather will return for the next few days. This is short-lived as the trough pushes inland Friday bringing our next chance for afternoon and evening thunderstorms. For now the threat is mainly along and east of the Cascades and thunderstorm activity should be isolated. I’m adding a slight chance for west side valleys for a few thunderstorms to pop-up.
Now for the smoke: with warmer and drier weather settling in fire and smoke activity will increase and air quality will deteriorate again. Inland areas will see increasing smoke and haze in the afternoon and evenings through Thursday. With thunderstorms back in the forecast Friday, that should help lift some of the smoke/haze out of the region again. After that, smoke and haze will be determined by how active the fires remain.
Temperatures heat up as we head into next week after the trough exits our region. We could be look at a hot start to next week, but weather models are showing another trough moving in by late week and this once again will help keep our temperatures from sky rocketing.
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Meteorologist Megan Parry