Search found 362 matches

by glenn.rolph
November 16th, 2012, 3:03 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Missing 0.5 Degree GDAS data
Replies: 3
Views: 2352

Missing 0.5 Degree GDAS data

ARL had an disk crash during the summer that caused us to loose part of our 0.5 degree GDAS archive. We are missing the period 04/20/2009 to 07/27/2010. If anyone archived this data from our archive at ftp://arlftp.arlhq.noaa.gov/archives/gdas0p5/ and would like to share it with us, please provide u...
by glenn.rolph
November 13th, 2012, 10:51 am
Forum: Wildfire Smoke
Topic: Where are the operational forecasts?
Replies: 1
Views: 4314

Re: Where are the operational forecasts?

The operational smoke forecasts for Alaska, Hawaii, and the CONUS are available in real time at: http://airquality.weather.gov/ ARL has an archive of the smoke forecasts and some verification results available at: http://ready.arl.noaa.gov/smoke_verify.php Further information can be found at: http:/...
by glenn.rolph
November 13th, 2012, 10:43 am
Forum: Repositories of HYSPLIT formatted data
Topic: GDAS Archive at University of Alaska
Replies: 2
Views: 4592

GDAS Archive at University of Alaska

The GDAS archive data for HYSPLIT is also being archived at the University of Alaska Fairbanks. The URL is:

ftp://gdas-server.iarc.uaf.edu/gdas1/
by glenn.rolph
November 13th, 2012, 10:40 am
Forum: Repositories of HYSPLIT formatted data
Topic: Arctic Region Supercomputing Center (ARSC) HRRR forecastdata
Replies: 1
Views: 4193

Arctic Region Supercomputing Center (ARSC) HRRR forecastdata

The Arctic Region Supercomputing Center (ARSC) High Resolution Rapid Refresh (HRRR) is an evolving prototype for an Alaska-grown implementation of a NWP forecast that parallels the NOAA Earth System Research Laboratory's HRRR initiative for the 48 contiguous United States. The model domain is 1050x1...
by glenn.rolph
November 13th, 2012, 10:35 am
Forum: Repositories of HYSPLIT formatted data
Topic: NOAA NCEP Data Repository
Replies: 0
Views: 3426

NOAA NCEP Data Repository

The HYSPLIT formatted forecast data can be obtained from the NOAA National Centers for Environmental Prediction (NCEP) at:

ftp://ftpprd.ncep.noaa.gov/pub/data/ncc ... plit/prod/
by glenn.rolph
November 13th, 2012, 10:20 am
Forum: HYSPLIT for PCs
Topic: Trajectory frequency and cluster analysis
Replies: 1
Views: 2123

Re: Trajectory frequency and cluster analysis

You should just be able to click "Execute Display" and get the frequency plot. The grid is set in the "Create a Trajectory Frequency Plot" window where the grid options are 1, 2 or 4 degrees. Make sure "View" is checked so a window will automatically open and display the plot. Look at your file INFI...
by glenn.rolph
November 13th, 2012, 10:15 am
Forum: Trajectory Model
Topic: Why multiple trajectories are different than just one?
Replies: 1
Views: 1426

Re: Why multiple trajectories are different than just one?

We discovered that it is not an error with the data or HYSPLIT. The issue is that when you run one trajectory it works fine, but when you run more than one trajectory, the time step of the model may change based on where the other trajectories are. The time step is set by the fastest trajectory the ...
by glenn.rolph
November 13th, 2012, 10:12 am
Forum: Trajectory Model
Topic: Wind speed along a trajectory
Replies: 1
Views: 1466

Re: Wind speed along a trajectory

Wind speed is not one of the trajectory output options for meteorological variables in HYSPLIT. However it can be computed from the difference in the hourly end point positions. DIST=SQRT[ (lat2-lat1)**2 + ((lon2-lon1)*cos(0.5*(lat2+lat1)))**2 ] * 111000 UBAR (m/s) = DIST/3600.0 A Google search will...
by glenn.rolph
November 13th, 2012, 10:10 am
Forum: HYSPLIT for PCs
Topic: How to create a particle plot?
Replies: 13
Views: 9221

Re: How to create a particle plot?

You first need to turn on the dumping of particles. You do this by going to

Advanced / Configuration Setup / Concentration

Click on number 9 (Input and output PARTICLE files), then set the interval you want to dump the particles. See the help on this menu for details.