The HPXX89 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HP): Pressure A1 (X): Global Area (area not definable) A2 (X): Not assigned T1ii (H89): Any parameter reduced to sea level (eg MSLP) (Remarks from Volume-C: H+ 66 (GLOBAL MODEL) MEAN SEA LEVEL PRESSURE)
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