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Estimated Actual Velocity (EAV)

Estimated Actual Velocity (EAV). What is EAV? EAV is a new AWIPS radar tool that will be included in the AWIPS 8.2 software to be deployed in January 2008. What does EAV do? EAV will provide the radar meteorologist with an estimated actual wind from the Base Velocity WSR-88D data.

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Estimated Actual Velocity (EAV)

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  1. Estimated Actual Velocity (EAV)

  2. What is EAV?EAV is a new AWIPS radar tool that will be included in the AWIPS 8.2 software to be deployed in January 2008.

  3. What does EAV do?EAV will provide the radar meteorologist with an estimated actual wind from the Base Velocity WSR-88D data.

  4. How does EAV work?EAV uses the solution of a right triangle to provide an estimate of actual wind speed.EAV = Doppler wind / COS @where @ is angle of wind direction off Doppler radial

  5. Determination of Doppler Estimated Winds Based on Degrees off Radar Beam

  6. Black arrow – Doppler wind Blue arrow - 2nd component of wind Red arrow – Actual wind @ EAV EAV = Doppler wind / COS @

  7. Base velocity was 50 kts at point where EAV = 90 kts

  8. Base velocity was 38 kts at point where EAV = 60 kts

  9. Uses of EAV?1. Estimate actual wind speeds in a squall line.2. Estimate winds in a hurricane.3. Estimate winds in a blizzard.Cautions – The estimated wind direction by the radar meteorologist must be accurate or bad EAV data will result. If the input wind direction is greater than ~70 degrees off radial, no EAV will be calculated.

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