Key findings include:
- Temperatures in the American West have gone up quickly. Since 1970, they have increased by about twice the global average.
- Snow melts earlier in the spring. Hotter, drier conditions last longer than they used to. The result is a longer wildfire season and conditions that are primed for wildfires to ignite and spread.
- The western wildfire season has grown from five months on average in the 1970s to seven months today. The annual number of large wildfires has increased by more than 75 percent.
- This is a recent and dangerous alteration of the natural, long-standing, and necessary role of wildfires as part of the forest landscape.
- The threat of wildfires is projected to worsen over time as rising temperatures lead to more frequent, large, and severe wildfires and longer fire seasons.
- Since 1970, regional temperatures have increased by 1.9 degrees Fahrenheit. By mid-century, temperatures are expected to increase an additional 2.5 to 6.5 degrees Fahrenheit.
May 24, 2018 | New York Times
The Places in the U.S. Where Disaster Strikes Again and Again
Jan 1, 2018 | Weather Underground | Category 6
Top Ten Global Weather/Climate Events of 2017: A Year of Landfalls and Firestorms
Dec 20, 2017 | ThinkProgress
Western states lived with a constant reminder of climate change in 2017
Dec 14, 2017 | ABC7 San Francisco
Calfire: Wildfire season 'elongated by upwards of 40-50 days'