1. If other displays and data are already loaded, select the Edit→Remove All Displays and Data menu item or the icon in the toolbar to clear them out.
2. Load in the ATCF data and create the Storm Track display.
   • Normally selecting Data→Special→ATCF Data will load in a data source with a predefined path to the National Hurricane Center ftp site.
   • But, for stability and speed in the workshop we copied over the data for 2008 and 2007 to our ftp site so...
   • In the URL chooser type in:
     https://resources.unidata.ucar.edu/idv/data/workshop/atcf/
   • Under Data Sources of Type select "ATCF Tropical Storm Data" (hint: click in the pull-down box and enter an 'a').
   • Load in the data source.
   • Create a Storm Track display.
3. Choose 2008→Basin:AL→IKE and select Load Tracks
4. Note the huge number of forecasts. We want to pare this list down.
   • Bring up the Properties dialog for the display. (Edit→Properties menu).
   • In the "Techs to use" tab select all of the Techs in the "Use" list. Click and press control-a.
   • Press Remove.
   • Select a number of Techs in the "Don't use" list and press Add. Make sure you include GFDL and HWRF in your selection.
   • Apply these selections by pressing OK.
5. Turn on the Forecasts checkbox to show the forecast tracks.
6. Note, the forecasts tracks are showing forecast hours which results in a complicated display. Turn this off by selecting a "None" for the Points Layout model.
7. Turn off all but one Forecast and set the Animation Mode to "Off".
8. Let's look at charting the forecasts.
   • In the Storm Chart tab select GFDL and HWRF and Observation in the Techs list.
   • Select one of the later times, e.g., 2008-09-10.
   • Select both Min Pressure and Max Windspeed.
   • Turn on Use Difference.

Unidata IDV Workshop for version 6.1u1 > Accessing and Displaying Data > Trajectory Data