Santa Ana Winds Wildfire Threat Index

This threat index draws information from networks of weather observation sensors across Southern California to categorize the threat of wildfires over the next six days. The site provides real-time information about weather conditions and fuel moisture levels to help users understand the threat of wind-promoted wildfires across 4 regions (zones) of Southern California.

Categories in the index are:

• NO RATING: Santa Ana winds are either not expected, or will not contribute to significant fire activity.
• MARGINAL: Upon ignition, fires may grow rapidly.
• MODERATE: Upon ignition, fires will grow rapidly and will be difficult to control.
• HIGH: Upon ignition, fires will grow very rapidly, will burn intensely, and will be very difficult to control.
• EXTREME: Upon ignition, fires will have extreme growth, will burn very intensely, and will be uncontrollable.