Upper

1000-500 MB Thickness Analysis

This thickness chart is created twice daily and is rendered from data provided by upper air balloon launches. Solid purple lines (isobars) display sea-level pressure in millibars; red lines indicate 1000-500 mb thicknesses in meters with the magic line (5400 m) displaed as a solid line. Windspeeds from the current Rapid Refresh Model are also displayed on this chart.