Watch Out Situation #4:  Unfamiliar with weather and local factors influencing fire behavior.

Thunderstorms cause significant hazards for wildland firefighters, including downbursts. Downbursts can cause extreme fire behavior and lightning. When thunderstorm development is likely, lookouts should be aware of the signs.

Approaching thunderstorms may be noted by a sudden reverse in wind direction, a noticeable rise in wind speed, and a sharp drop in temperature. Rain, hail, and lightning occur only in the mature stage of a thunderstorm.

Spot weather forecasts should be requested or submitted online for those fires that have potential for extreme fire behavior, exceed initial attack, or are located in areas where Red Flag Warnings have been issued.