estimated actual velocity (eav)
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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.
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
Determination of Doppler Estimated Winds Based on Degrees off Radar Beam
Black arrow – Doppler windBlue arrow - 2nd component of windRed arrow – Actual wind
EAV = Doppler wind / COS @
EAV@
Base velocity was 50 kts at point where EAV = 90 kts
Base velocity was 38 kts at point where EAV = 60 kts
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.