NOAA Weather Prediction Center
North America Weather Fronts
Latest NOAA fronts and high/low pressure drawn over satellite clouds and rain radar. Updated every 3 hours.
How to read fronts
Cold front
Cold air advancing. Blue line with triangles; brings sharp temperature drops, gusty winds and storms.
Warm front
Warm air advancing. Red line with half-circles; brings steady rain then warmer, humid air.
Stationary front
Neither air mass advancing. Alternating red/blue; can cause days of clouds and rain.
Occluded front
Cold front overtakes warm front. Purple line; mature storm systems.
H / L
High pressure (fair, calm) and low pressure (storms) centers.
Source: NOAA / NWS Weather Prediction Center. Click a map to open the full-size original.