AGL altitude not properly shown in BTs when more than 3 ancillary meteo parameters are calculated
Posted: March 11th, 2026, 10:13 am
I computed HYSPLIT backtrajectories with the 4 following, ancillary meteo data: PRESSURE, AIR_TEMP, RELHUMID, TERR_MSL. When plotting any BT from the GUI, instead of the requested AGL altitude (in .CFG files kmsl = 0) the last ancillary parameter (TERR_MSL) is plotted in the vertical coordinate. The line inside the BT listing my ancillary columns: 4 PRESSURE AIR_TEMP RELHUMID TERR_MSL. By just changing the NUMBER of ancillary columns from 4 to 3, and keeping all the four columns (3 PRESSURE AIR_TEMP RELHUMID TERR_MSL) the AGL altitude is properly plotted in the 'vertical coordinate' . Of course I can trick HYSPLIT just making a routine for just changing the declared number of ancillary columns in all my 15000 trajectories, but I was wandering if any possibility exist for doing this tidyly through the GUI, by changing some .cfg parameter, or else. Cheers