By Friday morning, Seattle will have a 90% chance of rain, the weather service said, and the probability of rainfall rises to 100% by Friday night. The Seattle area could see up to 1.25 inches of rain on Friday alone, according to the forecast. Chances of rain drop to 70% on Saturday, when less than a 10th of an inch of rain is expected to fall.

Firefighters were concerned Sunday about the possibility of fire spreading under trees and a warming forecast later in the week.

While relief from the heat in the form of cool, Pacific breezes are on the way to Western Washington, the near-record hot temperatures on Tuesday has allowed two major fires in the Northwest to erupt with flames and smoke during the day.