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Front: The transition zone between two distinct airmasses. The basic frontal types are cold fronts, warm fronts and occluded fronts.
Frost: The covering of ice that is formed on exposed surfaces whose temperature falls below freezing.
Fugitive emissions: Unintended gas leaks from the processing, transmission, and/or transportation of fossil fuels, CFCs from refrigeration leaks, SF6 from electrical power distributor, etc.
Fujita scale: System developed by Dr. Theodore Fujita to classify tornadoes based on wind damage. Scale is from F0 for weakest to F5 for strongest tornadoes.
Fungicide: Any pesticide used to control, deter, or destroy fungi, which are forms of plant life (including molds and yeasts) that lack chlorophyll and are unable to make their own food (such as the plant pathogen, powdery mildew).
Funnel Cloud: A rotating, cone-shaped column of air extending downward from the base of a thunderstorm. When it reaches the ground it is called a tornado.