Write a compelling news report highlighting the potential severe weather conditions facing Seattle and Western Washington, as unprecedented threats of thunderstorms, large hail, and even isolated tornadoes loom. Dive into preparations shared by local agencies including the U.S. National Weather Service and the Washington Emergency Management Division, emphasizing the importance of community safety and readiness. Capture the collaborative efforts to keep residents informed and prepared, and weave in practical advice for protecting homes, vehicles, and pets from the extreme weather.