Winds Aloft are forcasted and reported 4 times per day. This forecast is now made four times a day based on 0000Z,06000Z,1200Z and 1800Z data (the Z stands for Zulu and indicates Coordinated Universal Time). The forecasts are valid 6 (FD1/8), 12 (FD2/9), and 24 (FD3/10) hours after the observation date/times of 0000Z and 1200Z upon which they are based.
We actually parse the NOAA weather ever few minutes for weaher data like METARS, TAFS and winds aloft in the event a new report or revision comes in.