(Added: Photo from Duwamish Head)

The National Weather Service has extended the Air Stagnation Advisory alert – originally set to expire at noon today – until (updated) 11 am Friday. The NWS warns, “Air stagnation may lead to the development or worsening or poor air quality, and this may cause issues for people with respiratory problems.” (Here’s one place you can keep watch on the air quality.) So far there’s no chance of rain mentioned in the forecast before Saturday night.