Pressure decreases with height
There is less air above as elevation increases.
Pressure differences drive wind
Air accelerates in response to pressure gradients, modified by Earth's rotation and friction.
High and low systems have characteristic patterns
Large-scale circulation affects clouds, precipitation and wind.
Pressure is one clue, not a forecast by itself
Temperature, humidity, fronts and upper-air patterns also matter.
Source trail: NOAA: weather & atmosphere
This page explains scientific concepts for general learning. It does not replace laboratory safety procedures, professional engineering guidance, or individualized medical advice.