Search found 451 matches

by barbara.stunder
July 21st, 2020, 4:11 pm
Forum: Cluster Analysis
Topic: Problem setting up cluster analysis
Replies: 10
Views: 4435

Re: Problem setting up cluster analysis

Try to attach the files here so I can run a test.
by barbara.stunder
July 21st, 2020, 7:58 am
Forum: Cluster Analysis
Topic: Problem setting up cluster analysis
Replies: 10
Views: 4435

Re: Problem setting up cluster analysis

Open the text files TCLUS and TNOCLUS. TCLUS lists the trajectories clustered. TNOCLUS lists the trajectories not clustered, usually because of the 'Hours to cluster' and "Trajectory skip" inputs. If all the trajectories were used, TCLUS would be the same as INFILE. Because it says "Pass 1 out of 1"...
by barbara.stunder
July 20th, 2020, 8:29 am
Forum: Trajectory Model
Topic: Combining traj/freq at same location, different years
Replies: 1
Views: 1043

Re: Combining traj/freq at same location, different years

I am not quite clear on your question. The trajectory frequency program will run on the endpoints files listed in the file INFILE (see https://www.ready.noaa.gov/documents/Tutorial/html/traj_freq.html) whether they are sequential days or not. For example if you run trajectories for every days in Jun...
by barbara.stunder
July 14th, 2020, 8:59 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: FTP failed
Replies: 1
Views: 1117

Re: FTP failed

As given in the GUI, the nam12 archive began in 2007, but you are requesting data from 2005. Please try EDAS instead for 2005. README files for our archives are at https://www.ready.noaa.gov/archives.php.
by barbara.stunder
July 13th, 2020, 12:00 pm
Forum: Trajectory Model
Topic: Comparison between model results obtained three or more years later
Replies: 2
Views: 1203

Re: Comparison between model results obtained three or more years later

The mixed layer depth is in the meteorology file, and the archives have not been changed. How much different are the trajectories?
by barbara.stunder
July 13th, 2020, 8:29 am
Forum: HYSPLIT for PCs
Topic: Trajectory frequency plot
Replies: 4
Views: 3459

Re: Trajectory frequency plot

The error message is implying there is more than one trajectory in a tdump file. Is that the case? For example multiple starting heights. The frequency program can only handle one trajectory per tdump file.
by barbara.stunder
July 6th, 2020, 10:37 am
Forum: Cluster Analysis
Topic: Reference for HYSPLIT clustering algorithm
Replies: 2
Views: 1195

Re: Reference for HYSPLIT clustering algorithm

Stunder, B.J.B, 1996: An Assessment of the Quality of Forecast Trajectories, J. Appl. Meteor. 35 (8): 1319–1331.
by barbara.stunder
July 6th, 2020, 10:12 am
Forum: Users
Topic: NOAA ARL GFS soundinds data presentation
Replies: 1
Views: 729

Re: NOAA ARL GFS soundinds data presentation

Thank you for these suggestions, we will consider them.
by barbara.stunder
July 6th, 2020, 10:09 am
Forum: Dispersion Model
Topic: Measuring radionuclide dispersal
Replies: 4
Views: 1420

Re: Measuring radionuclide dispersal

The online version does not have this capability. Since you are a new HYSPLIT user, you should go through the Tutorial at https://www.ready.noaa.gov/HYSPLIT_Tutorials.php. See Section 15.1 for details.
by barbara.stunder
July 6th, 2020, 8:44 am
Forum: Trajectory Model
Topic: Backward trajectory error
Replies: 1
Views: 1015

Re: Backward trajectory error

The gdas0p5 would give some of the error - due to horizonal resolution, however we don't know the error in the gdas0p5. You need to know the real (observed) winds in order to know the error. You could compare model winds to some soundings over a long period of time and then estimate how that error c...