Weather Maps
Surface Analysis Map Explained: Fronts, Pressure, Isobars, and Weather Symbols
How to read a surface analysis map, including highs, lows, fronts, drylines, troughs, isobars, and station observations.
Quick answer: A surface analysis map shows what is happening near the ground: pressure systems, fronts, boundaries, winds, and observations.
Highs, lows, and isobars
High and low pressure centers shape wind and weather. Isobars connect equal pressure and reveal pressure gradients.
Tighter isobars usually mean stronger winds.
Fronts and boundaries
Cold fronts, warm fronts, stationary fronts, occluded fronts, troughs, drylines, and outflow boundaries can all focus weather changes.
These features help explain why storms form in one corridor and not another.
Using the map
Compare surface analysis with radar, satellite, and forecasts.
A single map shows one moment; loops and updates show how the pattern evolves.