SEATTLE — The White House on Tuesday announced the launch of Heat.gov, a federal website to spread awareness and resources so the public and policymakers can better respond to extreme heat. The website will have heat forecasts from numerous federal agencies, guides to plan and prepare for high temperatures, and opportunities to support public health programs and communities at higher risk of heat exposure. “President Biden has directed us to respond to the extreme heat gripping the nation. Extreme heat is a silent killer, yet it affects more Americans than any other weather emergency — particu…