Major Types of Clouds - TCu and Cb

Major Types of Clouds - TCu and Cb Towering cumulus is a vertically developed cumulus. It may or may not be a cumulus congestus because the important component is its vertical development. Its existence indicates considerable potential instability and possible strong vertical streams that affect the aircraft in flight.
 
Cumulonimbus may well be the most known cloud. It is a moisture-rich thunderstorm cloud that is vertically well-developed and which under ideal conditions can penetrate the tropopause and enter the stratosphere. It is associated with a range of phenomena hazardous to aviation: electrical discharges, turbulence, icing, strong upward and downward currents of air, showers, hail, strong winds, vortexes and gust fronts. If there is a strong upper wind, lee waves may occur on the lee side of the cumulonimbus cloud.
 
Cumulonimbus clouds may occur in the fronts (boundaries of two air masses), isolated, in lines or in convective complexes. The necessary conditions for the occurrence and development of Cb are: potentially unstable air mass, a sufficient amount of moisture and a trigger (to initiate the ascending motion of air).
 
If they are isolated, cumulonimbus clouds can be observed visually, as any other cloudiness. However, due to their influence on the aircraft they need to be perceived as early as possible and to the greatest possible distance. Therefore, their detection and monitoring is done by meteorological radars, satellites and lightning detectors. Meteorological radars are the most accurate if the radar network is sufficiently dense.