The QGDC40 TTAAii Data Designators decode as: T1 (Q): Pictorial information regional (Binary coded) T1T2 (QG): Significant weather A1 (D): 90°E - 0° northern hemisphere A2 (B): 7 hours forecast T1ii (Q40): 400 hPa (Remarks from Volume-C: H+07 below FL 245 SWL) Low Level Significant Weather Chart BLW FL245 - Outlook
The QGDB40 TTAAii Data Designators decode as: T1 (Q): Pictorial information regional (Binary coded) T1T2 (QG): Significant weather A1 (D): 90°E - 0° northern hemisphere A2 (B): 3 hours forecast T1ii (Q40): 400 hPa (Remarks from Volume-C: H+03 below FL 245 SWL) Low Level Significant Weather Chart BLW FL245