I know there have been better more detailed threads on this but a helpful reference for the next 36 hours.   time model starts to run   GFS: 10:30; 4:30 (AM/PM) GEFS (Eneembles):   12:00, 6:00 (AM/PM) NAM: 9:00, 3:00  (AM/PM SREF:  8:20, 2:20 (AM/PM) RGEM: 10:20, 4:00 (AM/PM) GGEM (CMC):  11:00 (AM/PM UKMET:  10:40 (AM/PM) ECMWF (Euro/ECM):  12:45 (AM/PM) ECM ensembles:  3:00 (AM/PM)     additional higher res model   MM5 AWR