National Weather Service United States Department of Commerce

St. Louis, MO

Weather Forecast Office

Red Flag Warning and Elevated Fire Danger Criteria

Weather.gov > St. Louis, MO > Red Flag Warning and Elevated Fire Danger Criteria

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.

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