The 5 pm observations are in. Sea Tac got to 103F. Thunderstorms have developed and the clouds are spreading over the crests and foothills...beautiful anvils from space (see image). And low clouds have spread to the coast.
Several of you have been sharing temperature readings, which I and others really appreciate! But keep in mind the following:
(1) Bank thermometers are notoriously inaccurate. (I will refrain from generalizing this to the reliability of banks in general)
(2) Temperatures measured in cars driving over asphalt during the day are often too high and not representative of the true air temperatures. Air temperature should be measured in the shade over a vegetated surface. Roads can heat up to 120-140F and thus can inflate car temperature readings. So drive your car over grass or vegetated surfaces if you want a dependable reading.
That said, there have been a number of reports of western WA temps over 110F. Here is a report from Mark Albright, research scientist at the UW:
The highest temperatures in western Washington today (29 Jul 2009) seemed to be between Portland and Olympia. Check out this map for 2009073000 UTC:
High temperatures reported today: Chehalis MS (CHHLS) reported 111F, Winlock (WINLK) 110F, and the Chehalis RAWS site reported 2 hours at 114 F (someone should check this thermometer for accuracy before we believe this one):