Search found 312 matches

by barbara.stunder
July 19th, 2019, 8:31 am
Forum: Users
Topic: GDAS terrain height?
Replies: 1
Views: 7

Re: GDAS terrain height?

All the fields in a HYSPLIT meteorology file are on the same grid, so yes, the GDAS1 terrain height is at 1 degree resolution. There is no finer resolution. The NCEP/NCAR reanalysis archive does not have terrain height, so HYSPLIT uses the surface pressure, which is in the file, to estimate the heig...
by barbara.stunder
July 17th, 2019, 9:01 am
Forum: HYSPLIT Workshop
Topic: Automatic download
Replies: 1
Views: 22

Re: Automatic download

It is possible to automatically run trajectories for a long time period using the "Run Daily" trajectory feature in the PC/Mac GUI after you download hysplit-compatible meteorology for the time period. See Section 6.1 Frequency Analysis in the Tutorial - https://ready.arl.noaa.gov/HYSPLIT_Tutorials....
by barbara.stunder
July 2nd, 2019, 8:55 am
Forum: Dispersion Model
Topic: Thin Plume
Replies: 3
Views: 58

Re: Thin Plume

I meant that the Pasquill stability class is not input to the HYSPLIT dispersion model. You are entering the Pasquill stability, along with meteorology observations to create a gridded meteorology file for input to the HYSPLIT dispersion model. Then with that meteorology, getting the thin plume. The...
by barbara.stunder
July 1st, 2019, 8:15 am
Forum: Dispersion Model
Topic: Thin Plume
Replies: 3
Views: 58

Re: Thin Plume

Where/how are you running HYSPLIT, and with what meteorology? The Pasquil stability is not an input to HYSPLIT.
by barbara.stunder
July 1st, 2019, 8:10 am
Forum: Users
Topic: Simulation over Airport and using QGIS
Replies: 1
Views: 50

Re: Simulation over Airport and using QGIS

1. See a description of HYSPLIT limitations at https://www.ready.noaa.gov/hypub/limitations.html 2. The HYSPLIT package does not include a program to plot vertical cross-sections of concentration. 3. Is the figure in QGIS different from the same plot in postscript/gif/pdf? Did you choose 'polygons' ...
by barbara.stunder
June 24th, 2019, 8:47 am
Forum: Trajectory Model
Topic: MET File to use
Replies: 1
Views: 70

Re: MET File to use

by barbara.stunder
June 24th, 2019, 8:45 am
Forum: Trajectory Model
Topic: MET File to use in running Trajectory
Replies: 1
Views: 42

Re: MET File to use in running Trajectory

Please see the Tutorial about trajectories and dispersion. https://ready.arl.noaa.gov/HYSPLIT_Tutorials.php. No single trajectory perfectly represents actual air motion, hence ensembles are preferable to single trajectories. Even though you are only interested in smoke 6 feet off the ground, what st...
by barbara.stunder
June 14th, 2019, 2:39 pm
Forum: Announce
Topic: June 2019 HYSPLIT upgrade at NCEP
Replies: 6
Views: 280

Re: June 2019 HYSPLIT upgrade at NCEP

We found bugs in the HYSPLIT-compatible GFS files related to precipitation. HYSPLIT should not be run with wet deposition until this is resolved. hysplit.tCCz.gfs0p25f - The precipitation in the file is labeled TPPA (total accumulation) but the data are really TPP6 (up to 6-h accumulation). READY me...