NCEP NAM CONUS Graphics - NAM Forecast vs RTMA Analyses

This page is a comparison of the North American Meso (NAM) forecast from 12Z 03 MAY 2012 and the best available Real-time Mesoscale Analysis (RTMA) valid at the same time. When any of the forecast hour links on the left is activated, the following charts will be displayed:

  • Upper left : NAM forecast (Eastern U.S.)
  • Upper right : NAM forecast (Western U.S.)
  • Lower left : RTMA analysis (Eastern U.S.)
  • Upper right : RTMA analysis (Western U.S.)
  • NOTE : For sea level pressure/850 mb/500 mb/250 mb fields, the NDAS analysis is displayed


    DISCLAIMER : This web page is not "operational" and therefore not subject to 24-h monitoring by NCEP's Central Operations staff.

    For more info on the NAM runs, email Eric Rogers at or Geoff DiMego at

    Get the NAM vs RTMA comparison graphics for the previous 7 days here (link opens a new window):

    Fri 04/27 Sat 04/28 Sun 04/29 Mon 04/30 Tue 05/01 Wed 05/02 Thu 05/03
    00z 00z 00z 00z 00z 00z 00z
    12z 12z 12z 12z 12z 12z 12z