High volume of pilot training or an unusual type of aerial activity. Unusual, often invisible, hazards such as aerial gunnery or guided missiles. Military training activities that necessitate acrobatic or abrupt flight maneuvers.
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Controlled firing areas are shown by a comb blue line. Controlled firing areas are shown by a comb magenta line. Controlled firing areas aren’t charted.
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Dissipating. Mature. Cumulus.
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Zipper blue lines Grey Lines Light blue lines
cumulus stage. downdraft stage. mature stage.
High humidity, lifting force, and unstable conditions. Lifting force, moist air, and extensive cloud cover. High humidity, high temperature, and cumulus clouds.
a cloud with extensive vertical development. a rain cloud. a middle cloud containing ice pellets.
Turbulence and showery precipitation. Haze and smoke. Poor visibility and smooth air.
Radiation fog and ice fog. Advection fog and upslope fog. Steam fog and ground fog.
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increased endurance. an inflight fire. a change in aircraft center of gravity.