Updated Wednesday at 6:30 p.m.
We got through the month of July with just mild to moderate summer warmth, but much like June, July is going to go out with a heatwave. Thankfully, this won't quite be a repeat of the historic heatwave, but highs will hover near 90 before the month is through.
A building ridge of high pressure plus a steady, dry north wind will crank up the mercury the next few afternoons. Highs on Thursday will hit the upper 80s, and we'll see the heat peak on Friday with highs on either side of 90 degrees in the Emerald City. Saturday will be a bit cooler, with highs dropping back into the middle to upper 80s, but it will also be a bit stickier as high clouds start to stream into the region...
Those clouds will be a sign that thunderstorms are bubbling up nearby, and we'll see rising cumulonimbus to our east on Sunday as they close in on the Cascades. Our dry streak, with now stands at 44 days in a row at Sea-Tac Airport (in 5th place for all-time driest on record), may finally wrap up if the showers get close enough to the airport before the day is a wrap.
As welcome as the summer rain will be, it comes with a caveat: lightning. Summer showers tend to be heavy on the lightning, but light on the precipitation, which is always extra worrisome during wildfire season. We'll hope that we can avoid new burns next week as the storms rumble through the region.
Have a good night,
Meteorologist Shannon O'Donnell
The KOMO 4-Cast Team
Today's Record Temperatures