HYSPLIT Forum: hysplitbbs.arl.noaa.gov

I saw a program on TV that stated volcanic gas and/or ash is necessary for earth’s healthy atmosphere, and that volcanic

Is it true that the VAAC’s do not issue volcanic ash dispersion model forecasts (sometimes called “VAFTADs” using the

I am doing a project on air pollution due to Volcanic activity. I am missing one major part of the project: a model for

The HYSPLIT distribution models will often show significant areal coverage. Is there a threshold particle density that

As an airline pilot I always check the volcanic ash dispersion forecasts for Colima and Popoctptl whenever I fly

When I “Run Standard Model” after saving the “Trajectory Setup”, I get a static message Model started … HYSPLIT48

Why are the results different for the same run on the web versus the PC?

I received the following error. What could be wrong?

I have been trying to use the convert program to trim the white space around the edge of the hysplit plots using the

I am attempting to run the HYSPLIT model daily for a 10 year period. I received the error message “*ERROR* runset:

I am trying to calculate trajectories using my own MM5 output files. I compiled the mm5toarl routine and created the

When using trajplot.exe to plot multiple HYSPLIT output files, we are having trouble getting trajplot to recognize

Why can’t I run a back trajectory from 1900 UTC on 31 July, 2001 using downloaded FNL data? I attached my CONTROL file

But I was wondering if the website accesses the hard drive, or if the software is actually not necessary and the website

Warning metset: Old format meteo data grid forrtl:severe:Program Exception -access violation

I downloaded some archived files from the ftp site, and when I ask the model to use them I get the following error

How do I calculate deposition?

My problem is that generating one concentration and one GIS map at a time is very time-consuming and I am wondering if

At this time I could not find any of these properties for (Hg+2 or HgO).

How do I run the dispersion simulation backwards?

Is there a way to run the model in “batch mode” that would generate deposition and concentration for each endpoint?

The model prints on a large scale (all of Europe), while the concentration area itself is sometimes rather small. Is it

Please let me know is it possible to classify the trajectories by cluster analysis and draw a mean trajectory of each

When I set up a matrix run and have the heights specified at a certain altitude (using MSL), why do the results show

I purchased NCEP reanalysis GRIB data for summer 2001, downloaded the PC HYSPLIT model, and figured out how to convert