HYSPLIT Forum: hysplitbbs.arl.noaa.gov

Good morning,

We used the HYSPLIT Trajectory Model (Compute archive trajectories - Normal - GDAS 0.5 °- 3170 meters AGL) with the objective of analyzing the trajectories associated with the Nevado del Ruiz volcano (4° 53' 43' 'N 75° 19' 21''W) for different periods of the year 2015. However for the days 19 and 20 of February, the trajectories obtained showed a quite strange behavior.

We would like to know what these behaviors may be due to?

Have you looked at the wind fields or height contours using the 2D plotting programs at https://ready.arl.noaa.gov/READYamet.php to see if the trajectories look plausible? The trajectory is just a computation using the wind fields. The GDAS0P5 is not available for plotting but the GDAS1 is. You can also look at trajectories starting at different hours/days to see if these trajectories look reasonable.

We will try to see what results we get.
Thanks a lot!