Thermal inversion

• Thermal inversions or just inversion layers, are areas where the normal decrease in air temperature with increasing altitude is reversed and air above the ground is warmer than the air below it.
• Inversion layers can occur anywhere from close to ground level up to thousands of feet into the atmosphere.
• Inversion layers are significant to meteorology because they block atmospheric flow which causes the air over an area experiencing an inversion to become stable.
• This can then result in various types of weather patterns. More importantly, though, areas with heavy pollution are prone to unhealthy air and an increase in smog when an inversion is present because they trap pollutants at ground level instead of circulating them away.
• During an inversion episode, temperatures increase with increasing altitude.
• The warm inversion layer then acts as a cap and stops atmospheric mixing. This is why inversion layers are called stable air masses.
• Temperature inversions are a result of other weather conditions in an area.
• They occur most often when a warm, less dense air mass moves over a dense, cold air mass. This can happen for example when the air near the ground rapidly loses its heat on a clear night. In this situation, the ground becomes cooled quickly while the air above it retains the heat the ground was holding during the day.
CONSEQUENCES OF THRMAL INVERSIONS
• One example of these is freezing rain. This phenomenon develops with a temperature inversion in a cold area because snow melts as it moves through the warm inversion layer. The precipitation then continues to fall and passes through the cold layer of air near the ground. When it moves through...

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