A short-term forecast was issued within the hour (3:16 p.m.) by the National Weather Service in Seattle:
SHOWERS AND THUNDERSTORMS IN THE CENTRAL AND SOUTHERN PUGET SOUND REGION WILL MOVE SLOWLY TO THE EAST SOUTHEAST AT 10 MPH OVER THE NEXT COUPLE OF HOURS. SOME OF THESE STORMS MAY CONTAIN SMALL HAIL…BRIEF HEAVY RAINS…GUSTY WINDS…AND LIGHTNING.