A push of marine air tonight will send in the clouds and fog overnight through the Chehalis Gap into the south and central Sound by Thursday morning. This will signify an end to our heat wave. While still warm Thursday after the am clouds clear, the hottest weather will be behind us - for now.

The Puget Sound region is expected to warm up into the upper-80s and lower-90s Tuesday, with the rest of the week following suit.

Seattle's National Weather Service has issued a Heat Advisory from noon today until 10 PM PDT Wednesday due to high temperatures.

A heat advisory is in place across the Northeast, from Maryland to Maine, where residents are bracing for temperatures 5 to 15 degrees above average. The heat index -- what the temperature feels like with humidity -- could reach 103 degrees in Philadelphia on Wednesday and Thursday.

Seattle's forecast includes heat, humidity, and thunderstorms with varying precipitation chances throughout the week.

Western Washington is experiencing a return of hot summer temperatures, with highs reaching 90 degrees in some areas over the weekend.Another wave of heat is a

SEATTLE - Seattle is bracing for a heat wave this week. Highs on Tuesday will reach at least 88 degrees. The blistering heat could persist into Thursday. Communities near the Cascades and across the South Sound could wind up in the mid 90s!

A triple-digit heat wave will arrive in Southern California on Wednesday, affecting inland communities, increasing health concerns. A KCAL News Next Weather Alert is in effect through Friday for the Inland Empire, valleys and high deserts. The alert was issued to warn communities about the weather event that will likely alter daily life.

The most sustained heat wave of the season is on deck, with a string of 80-degree temperatures for the Seattle area extending into the foreseeable future. Highs in the 90s are also possible around the Sound in the next week as well, according to KOMO News Meteorologist Shannon O'Donnell.