Updated Saturday 11:20 p.m.
The hot, dry weather has been relentless this summer in the Pacific Northwest, and the records continue to fall...with highs in the 90s around the Sound again Saturday, we not only tied or broke several daily high temperatures records, but we also added to another amazing stat: August 1st was the 12th day this summer at or above 90 degrees, leaving the former record of 9 such days (set back in the summer of 1958) further in the dust.
Speaking of dust, it's also bone dry and rather hazy, and fire danger remains high. A Red Flag Warning continued on Saturday over the Cascades, Olympics, and many sections close to the Oregon state line as extreme heat coupled with low humidity continued to be a problem with abundant dry fuel in place.
The big area of high pressure responsible for our summer heat presses on through Seafair Sunday. Lows will bottom out in the 50s to low 60s around the Sound beneath beautiful starry skies...comfortable conditions for anyone camping outside this weekend. Very warm temperatures will be back for one more day on Sunday, with highs on either side of 80 degrees around Bellevue, Bremerton and Black Diamond. Another Heat Advisory continues to underscore the fact that it is very warm, at least by Northwest standards.
Monsoonal moisture from the Desert Southwest continues to creep into Oregon overnight, and some of those thundershowers may bubble up from the Cascades and into Eastern Washington by Sunday evening. This will certainly be something to keep a close eye on, as the introduction of lightning into our weather picture will further increase fire danger.
By the early part of next week, that stubborn high starts to back down again, making way for an upper trough of low pressure to nudge back into the region. This will encourage the marine layer to spread from the coastline and into the Sound as stronger onshore flow returns, and we'll begin chipping away at the heat. Look for highs to drop into the middle 80s by Monday, then fall into the upper 70s in Seattle and Tacoma Tuesday and Wednesday. Morning clouds will be present in parts of the Sound, although it still looks mainly sunny each afternoon.
We'll see another ramp up into the low 80s late in the week and into next weekend...the summer that continues to bring the heat will keep it coming.
Have a good morning,
Meteorologist Shannon O'Donnell
The KOMO4 Forecast Team