What is low pressure and what does it mean for Colorado weather?
When the atmospheric pressure is below 1013.25 millibars (the equivalent of 29.92 inches of mercury), an area is considered to be under low pressure. This implies that the atmosphere is “less dense” and therefore the air tends to rise. Winds flow in a counter-clockwise motion around the center of low pressure. Since the air is rising under an area of low pressure, it cools and condenses generally causing clouds and possibly precipitation.
