After a few days of unusual heat, a moist low pressure system is expected to move north toward and across the region. This low will bring rain and cooler temperatures by Saturday with possible thunderstorms and heavy rain, especially from the Cascades westward. The computer weather models have shown this scenario for a long time but there is still some uncertainty with the exact timing and rain amounts. ​There are high school outdoor graduation ceremonies planned on Saturday so rain and thunderstorms may impact these events.

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