8-hour forecast from NCEP’s North American Mesoscale (NAM) model

8-hour forecast showing mean sea level pressure (solid lines) in millibars (mb), 1000-500 mb thickness (a measure of temperature of a layer) in decameters (red and blue dotted lines), and six-hour total precipitation in inches (colored contours using scale on left). The forecast was valid May 24, 2007.