POPProbability of PrecipitationPopcorn ConvectionSlang for showers and thunderstorms that form on a scattered basis with little or no apparent organization, usually during the afternoon in response to diurnal heating. Individual thunderstorms typically are of the type sometimes referred to as air-mass thunderstorms: they are small, short-lived, very rarely severe, and they almost always dissipate near or just after sunset.POPSProbability of PrecipitationTropopauseThe upper boundary of the troposphere, usually characterized by an abrupt change in lapse rate from positive (decreasing temperature with height) to neutral or negative (temperature constant or increasing with height).Tropopause JetType of jet stream found near the tropopause. Examples of this type of jet are the subtropical and polar fronts.
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