Fire weather refers to the specific atmospheric conditions, such as extremely low humidity and high winds, that make it easier for wildfires to ignite, spread rapidly, and become difficult to control. Matthew Mehle, Lead Meteorologist and Spotter Program Manager for the San Francisco Bay Area Weather Forecast Office talks in depth about increase in fire weather days across the western U.S. and about the winds that have driven wildland blazes into urban areas across California. This is "master class" on fire weather and climate change.