National Weather Service United States Department of Commerce

Storm Impacting the Northwest U.S.; Fire Weather Conditions in Southern California; Severe Weather in the South

A Pacific storm is bringing areas of low elevation rain, moderate to heavy mountain snow, and high winds to the Northwest. Strong Santa Ana winds and very dry conditions are producing elevated to critical fire weather conditions in southern California. Isolated strong to severe thunderstorms are possible through early Wednesday morning across parts of northeast Texas into western Tennessee. Read More >

All three of the following criteria must be exceeded in order for Red Flag Warning conditions to be met:

  • Sustained 20 ft Winds: >15 mph
  • Relative Humidity: < 25%
  • 10 hr Dead Fuel Moisture: <9%

Below is a matrix that describes the Elevated Fire Danger criteria:

Elevated fire danger matrix for the St. Louis forecast area.