gen-in-3-4-sentences-explain-high-and-low-pressure-systems-state-b55a

In 3-4 sentences, explain high- and low-pressure systems. State any key formula.

High-pressure systems occur where air sinks and diverges at the surface, typically bringing clear, calm weather, while low-pressure systems occur where air converges and rises at the surface, often producing clouds and precipitation. Air flows from high to low pressure regions, driven by the **pressure gradient force** given by **PGF = -(1/ρ)(ΔP/Δx)**, where ρ is air density and ΔP/Δx is the pressure change over distance. In the Northern Hemisphere, the Coriolis effect deflects this flow, causing air to rotate clockwise around highs (anticyclones) and counterclockwise around lows (cyclones). The balance between pressure gradient and Coriolis forces often produces **geostrophic wind**: **V_g = (1/fρ)(ΔP/Δn)**, where f is the Coriolis parameter and Δn is the distance perpendicular to the flow.