Question

Why does decreasing air pressure indicate an approaching storm?

Answer 1

When cold air encounters warm air, the warm air rises over the cold air and makes surface air pressure drop. As a result, a low-pressure system forms, and winds begin to blow. This is how storms form in response to changes in air temperature.

Step-by-step explanation:

Answer 2

In general, a falling barometer indicates the approach of a storm. If the mercury is over 30.20 inches but falling quickly, warmer, cloudier weather is coming. If the mercury continues to fall, the weather will worsen. When the mercury level is between 30.20 and 29.80 inches and dropping rapidly, expect precipitation