Moisture streaming into the Pacific Northwest will produce heavy rain that may cause localized areas of flash flooding and debris flows. Please Contact Us. Please try another search. Multiple locations were found. Please select one of the following:. Location Help. Customize Your Weather. Privacy Policy. Density Altitude Calculator Weather. Current Hazards. Current Conditions. Surface Observations Satellite Observed Precipitation.
Here is an example of one:. Of course, it might be a lot simpler to use our air density altitude calculator instead though having a paper chart as a backup is also a good idea when in flight. We also plot a graph of the pressure altitude line you are currently on, just like you see in the chart. Let's now look at how to find density altitude.
The constants in the equation above are derived from the ISA model's constants stated in the previous section. We can now use Omni's air density calculator to calculate the air density at a given dry air pressure, water vapor pressure i. The water vapor pressure Pv can be calculated from the air temperature and relative humidity using the equation:.
We can use weather reports to calculate a value for the air pressure. An altimeter setting and weather station elevation in an aviation weather report is what we need to determine the air pressure accurately. The altimeter setting is the value in the Kollsman window of an altimeter.
It is used to correct a plane's altimeter for air pressure changes due to weather. The air pressure can be found from the altimeter setting and weather station height using the equation:. Let us now explain the simple steps you need to follow to calculate your density altitude using Omni's density altitude calculator. You'll now have a better understanding of your plane's engine performance and the amount of lift you get from its wings, thanks to converting the current conditions to an altitude based on the standard atmosphere model.
Let's go through an example of calculating the density altitude. A recent weather report from a weather station with an elevation of 1, m 4, ft gives an altimeter setting of mb We can now calculate the air density using the equation defined above and by converting pressure and temperature units:. Embed Share via. Table of contents: What is density altitude? How to calculate density altitude? Example of finding density altitude. What is density altitude? Here is an example of one: Density altitude chart Source: m0a.
Read off the corresponding pressure altitude conversion factor from the list of numbers to the right of the graph. Add the elevation of the weather station to this conversion factor. Find the current air temperature on the x-axis of the graph and travel upwards until you get to the value of pressure altitude conversion factor plus station elevation , using the lines labelled with pressure altitude.
Read across to the y-axis to find the density altitude. How to use our density altitude calculator? Input the outside air temperature. The next step is to specify the moisture content of the air. You can either enter the dewpoint temperature or the relative humidity depending on which one you know.
Input your altimeter setting. You can get this value from a recent weather report. Use the value from the nearest weather station.
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