Slayt 1 - RTC, Regional Training Centre - Turkey

Highlights2001 (November) – Major changes to Eta resolution changed to 12 km, 60 layers for all four daily runs major upgrades to grid-scale precipitation.2002 (March) – AVN runs four times a day out to 384 hrs. Resolution T170L42 to180 hrs thereafter T62L282002 (April) – RUC-20 replaced RUC-2. 50 levels, 20 km grid spacing, improved microphysics and convection boundary conditions from 6 and 18 UTC Eta instead of using older 00 and12 UTC Eta.2002 (April) – MRF is replaced by the 00Z AVN2002 (Sept-Oct) – AVN now referred to as the Global Forecast System model (GFS)2002 (October) – Resolution in GFS changed to T254L64 to 84 hr, T170L42 to 180 hr, T126L28 to384 hr2003 (May) – Change from OI to 3D-VAR in RUC2003 (July) – Eta 06 UTC and 18 UTC runs extended to 84 hr. (all 4 daily runs to 84 hr)2004 (March) – GFS ensemble run 4 times daily. Resolution T126 0-180 hrs, then T62 to 384 hrs.2004 (April) – multiple changes and updates implemented in the RUC2005 (January) – Eta model renamed as North American Model (NAM)