The operational North Amercian Meso (NAM, formerly Eta) is run four times per day (00,06,12,18Z); on the IBM-SP all cycles run to 84-h.
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 eric.rogers@noaa.gov or Geoff DiMego at geoff.dimego@noaa.gov