MetOffice FAX Charts (from T+24h to T+120h) Chart Update Information Analysis charts are usually available by 03:20. 09:20, 15:20 and 21:20 24-hour forecasts are usually available by 05:20. 11:20, 17:20 and 23:20 T+36 and T+48 forecasts by 06:20/18:20 UTC T+60 and T+72 forecasts by 07:20/19:20 UTC T+84 forecasts are only issued once a day at about 09:30 UTC T+96 and T+120 forecast are only issued once a day, based on 12:00UTC data, usually available after 23:20 UTC