Vertically-Uniform Westerly Winds

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Presentation transcript:

Vertically-Uniform Westerly Winds Wind entirely perpendicular to beam Wind entirely along-beam

Analytic Evaluation If the horizontal wind components u and v are known, and vertical velocity is negligible, then the radial velocity vR is given by: projects the horizontal wind onto a sloping elevation angle (since vR is along the slope, not a 2-D surface like u and v) ϕ

project u and v onto the radial given by the chosen azimuthal angle θ Analytic Evaluation If the horizontal wind components u and v are known, and vertical velocity is negligible, then the radial velocity vR is given by: project u and v onto the radial given by the chosen azimuthal angle θ horizontal wind direction = azimuth angle: vR ~ wind speed (slightly smaller due to tilt angle) horizontal wind direction azimuth angle: vR = 0

Cold Front – Wind Discontinuity Similar to previous slide, except rotated with wind and with discontinuity

Westerly Shear As radar beam becomes elevated with height, inferred velocity increases

Westerly Shear with Confluence Inferred inbound velocities skew to right of N-S radial

Westerly Shear with Diffluence Inferred outbound velocities skew to left of N-S radial

Westerly Elevated Jet As radar beam becomes elevated with height, inferred velocity increases to jet level, then decreases

Backing Winds with Height Note backing of winds through progressively distant range ring locations

Veering Winds with Height Note veering of winds through progressively distant range ring locations

Veering and Backing Winds with Height Any volunteers wish to take this one on?

The radar location is indicated for each panel by the black star. Pure Rotation The radar location is indicated for each panel by the black star.

The radar location is indicated for each panel by the black star. Pure Convergence The radar location is indicated for each panel by the black star.

Rotation + Convergence The radar location is indicated for each panel by the black star.