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High volume of pilot training or an unusual type of aerial activity. Military training activities that necessitate acrobatic or abrupt flight maneuvers. Unusual, often invisible, hazards to aircraft such as artillery firing, aerial gunnery, or guided missiles.
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.
Zipper blue lines Grey Lines Light blue lines
Dissipating. Mature. Cumulus.
High humidity, lifting force, and unstable conditions. Lifting force, moist air, and extensive cloud cover. High humidity, high temperature, and cumulus clouds.
cumulus stage. downdraft stage. mature stage.
Warm, moist air over low, flatland areas on clear, calm nights. Moist, tropical air moving over cold, offshore water. The movement of cold air over much warmer water.
Turbulence and showery precipitation. Haze and smoke. Poor visibility and smooth air.
Hail. Lightning. Heavy rain.
a cloud with extensive vertical development. a rain cloud. a middle cloud containing ice pellets.
