Convection which occurs without cloud formation is called dry convection, while the visible convection processes referred to above are forms of moist convection.
Moist convection in the atmosphere is characterized by deep, saturated updrafts and downdrafts, and unsaturated downdrafts driven largely by the evaporation and melting of precipitation.
( However, these same areas may be the only places to experience moist convection in winter and provided the air is cold enough, and the sea is close and upwind, then snow showers can be frequent. ) Heat from major urban areas (provided areally ...
However, convection is not always made visible by clouds. Convection which occurs without cloud formation is called dry convection, while the visible convection processes referred to above are forms of moist convection.
From a dynamical perspective, this term pertains to processes with timescales ranging from the inverse of the Brunt-Väisälä frequency to a pendulum day, encompassing deep moist convection and the full spectrum of inertio-gravity waves but stopping ...
 See also: Cloud, Convection, Cumulus, Surface, Precipitation
  
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