The NOAA forecast calls for "hazardous weather conditions tonight July 13 with thunderstorms and showers expected.

Here's their forecast:

"THUNDERSTORMS WERE DEVELOPING OVER THE CENTRAL CASCADES LATE THIS AFTERNOON. THESE STORMS WILL MOVE WEST...REACHING THE SOUTH SOUND REGION AND SOUTHWEST INTERIOR OF WASHINGTON BY 7 PM. THUNDERSTORMS WILL CONTAIN DANGEROUS CLOUD-TO-GROUND LIGHTNING...INTENSE BURSTS
OF RAINFALL...AND SMALL HAIL. IF YOU HEAR THUNDER...HEAD INDOORS.