--Derrick James Apr 7, 2021 The National Park Service details the National Fire Danger Rating System. Since 1974, five rating levels have been used to describe danger levelsto the public through press releases and signing. Levels are commonly displayed on signs located at fire departments and state and federal parks across the area. 1. Low (Green) Fire starts are unlikely. Weather and fuel conditions will lead to slow fire spread, low intensity, and relatively easy control with light mop up. Controlled burns can usually be executed with reasonable safety. 2. Moderate (Blue) Some wildfires may be expected. Expect moderate flame length and rate of spread. Control is usually not difficult and light to moderate mop up can be expected. Although controlled burning can be done without creating a hazard, routine caution should be taken.