The PPTA89 TTAAii Data Designators decode as: T1 (P): Pictorial information (Binary coded) T1T2 (PP): Pressure A1 (T): 45°W - 180° northern hemisphere A2 (A): Analysis (00 hour) T1ii (P89): Any parameter reduced to sea level (eg MSLP) (Remarks from Volume-C: Surface weather chart with plotted observations (manually modified))
The QPTA89 TTAAii Data Designators decode as: T1 (Q): Pictorial information regional (Binary coded) T1T2 (QP): Pressure A1 (T): 45°W - 180° northern hemisphere A2 (A): Analysis (00 hour) T1ii (Q89): Any parameter reduced to sea level (eg MSLP) (Remarks from Volume-C: Surface weather chart with plotted observations (manually modified))