
Puget Sound Weather Outlook
Updated Wednesday 6:15 a.m.
Today we will make weather history. Whether you've lived here for 3 months, 3 years, 30 years, even 70 years... today will be the hottest day you've ever experienced in Seattle. Our forecast for this afternoon is 101 degrees. That'll break the all-time record high, which is 100 degrees (set 15 years ago in July 1994).
First, we will set a record this morning for the warmest "night" ever. Lows will likely stay in the 71-72 degree range, and we've never had a day where we didn't fall below 70 degrees. That will change after today.
So -- stay safe and stay cool today -- and go do something fun... as you'll likely remember this day for many decades to come!
(Extended forecast from Scott Sistek) No real relief Wednesday night and Thursday, which could also work to once again set or tie both the nighttime and daytime temperature records. Forecast models show an ever so slight cooling of the atmosphere Thursday -- enough to lop off a degree or two, but good luck noticing. We're going with a high of 99 for Seattle, but plenty of 100s still dotting the eastern and southern landscape.
The winds of change start to blow on Friday. Models show the thermal trough ekeing east into Eastern Washington. Normally that would bring in a rush of marine air, but not this time as the ridge is too strong. What it should do is at least allow a trickle of cooler air in -- closer to what we have seen in the days and weeks leading up to the heat wave - that should give us 10 degrees of cooling!!! Of course, that's still the low 90s. But at least Thursday night's low should be farther down into the low-mid 60s.
With the slight marine flow, that does mean the coast returns as a suitable place to escape the heat Friday and this weekend as they should drop back into the 70s.
Now, we're still having trouble finding when the heat wave is completely vanquished. With the ridge of high pressure still entrenched and stuck between a low in northeastern Canada and another off the California coast, we're just not getting the dynamics to generate that big push of marine air. In fact, some models hint at reenergizing the heat Sunday into early next week, although more 90ish than 100ish. We're still leaning cooler due to the fact that this can't go forever, but we might need to raise those temperatures next week a bit.
(Remember, the 1977 heat wave went 18 days at 79 or hotter, with 13 at 85+). Models seem in finally indicate a get-us-back-to-the-70s push the middle of next week. Let's hope they're late.