Laserfiche WebLink
<br /> <br /> <br />COLD <br />AIR <br /> <br />> <br /> <br />WARM <br />AIR' <br /> <br /> <br />Convective heating <br /> <br />Air also rises through uneven heating of the ground. <br />air overlying the warmer ground areas is heated more <br />that over t~e cooler ground. The warmer air is less <br />and rises fn a manner similar to a hot air balloon. <br />process, termed convection; accounts for the origin <br />many of South Dakota's summer afternoon storms. <br /> <br />The <br />than <br />dense <br />This <br />of <br /> <br /> <br />':'1:. <br /> <br />When the surface air is not very moist (or humid), the air <br />has to be,l~fted to very high altitudes before it cools <br />enough for'./condensation to take place. The lifting mechanisms <br />are often insufficient to carry the surface air to such <br />altitudes. Even when they are, the resulting cloud bases <br />may be so high that most precipitation will evaporate in the <br />long fall to the ground. <br /> <br />30 <br />