To load sounding data see Choosing a RAOB Data Source from a Remote Server and Choosing a Gridded Data Source from a Remote Server.
The IDV Sounding Display includes an aerological (thermodynamic) diagram (e.g., Skew-T, Stuve, Emagram), a table of related aerological parameters, a hodograph and a table readout of the data.
The hodograph display is enabled if the plotted data includes wind fields. You can rotate the display to see the vertical structure as well as the horizontal structure of the winds.
The Table tab shows the data in table form:
A label at the top of the sounding window shows the latitude-longitude position of the sounding. RAOB station location is shown on the main IDV display as a small colored square. When displaying sounding plots made from gridded model output, the position of the sounding is shown in the main 3D view window by a solid-color selector point and vertical line. You can move this model-output-based sounding position over the map by dragging the selector point with the left button.
When displaying a sounding diagram made from model output, you can use the time animation control to step through the time sequence.
To increase precision using the sounding diagram, enlarge the window by dragging on the edges. You can zoom the sounding diagram by holding down the Shift key and dragging the right button upwards; drag downwards to zoom out. You can pan the diagram by dragging the mouse pointer in any direction while pressing the right mouse button.
The temperature and dew-point traces can be modified via the cursor. Press the left button on the first data-point to be modified and drag it horizontally along an isobar to the desired position, then move the pointer diagonally along an isotherm to keep the data-point at the desired position and to pick-up the next data-point. Repeat until done and then release the mouse button.
The Parcel Path checkbox allows for the selection of the origin of the path of a parcel of air lifted pseudo-adiabatically from the initial point to the top of the diagram. Check Parcel path to display the path of a lifted parcel.
The Virtual Temperature checkbox controls whether or not the virtual temperatures of the environmental profile and pseudo-adiabatically lifted air-parcel are displayed.
The Grid Points checkbox controls turns on the display of the grid points in the main display.
The Parcel Mode menu allows for the specification of how the initial conditions of the pseudo-adiabatically lifted air-parcel (i.e. the parcel's pressure, temperature, and moisture content at the start of the pseudoadiabatic lifting) are determined from the environmental sounding (i.e. the temperature and dew-point profiles according to the mode indicated by . choices are:
The Consecutive Profiles checkbox controls turns on the display of two profiles consecutive in time. The dash line is for the earlier time step, and the solid line is for the later time step. This allows user to compare the stability change in the atmosphere. If the pair of the profiles not consecutive in time and you want to do the comparison, you need to remove those time steps between them through the field selector data subset panel.
Customize menu allows the user to control what is shown
in the display (e.g., Dry Adiabats, Saturation Adiabats, Saturation Mixing Ratios)
and to switch the diagram type between Skew-T, Stuve and Emagram.
Soundingmenu to allow for the selection of the sounding to display:
Click on the Stations check-box in the lower right corner to toggle visibility of the RAOB station location mark in the main display window.