The weather forecast calls for an abrupt switch from cloudy and showery to a heat wave beginning as soon as Thursday. Next week could start with the hottest days of the year so far in many places around the Northwest.
For Portland, the National Weather Service is forecasting a high of 88 on Sunday and 91 on Monday.
For Seattle, a high of around 80 on Monday.
Spokane could see the mercury hit 96 on Sunday and near 99 by Tuesday.
Boise and Medford could hit triple digits by Saturday and 105 degrees on Monday.