This map shows the current radar, frontal boundaries, and areas of high and low pressure for the United States. Cold fronts are depicted in blue, warm fronts in red, and stationary fronts in alternating blue and red. Occluded fronts are depicted in purple. Front positions are updated every 3 hours. Areas of constant pressure are bound by white contour lines and show changes from high to low pressure. The key below the image corresponds to the radar.