Calculates \(A\), a parameter for the Willoughby wind model, using equation 10c (Willoughby et al. 2006).
will10c(vmax_gl, tclat)Numeric vector of the tangential wind component of the maximum gradient wind speed, in meters per second
Numeric vector of the absolute value of latitude, in degrees.
A numeric vector that is a parameter required for the Willoughby model.
This function calculates \(A\) using equation 10c (Willoughby et al. 2006):
$$A = 0.0696 + 0.0049 V_{max,G} - 0.0064 \phi$$
where:
\(A\): Parameter for the Willoughby wind model (any value of A calculated as negative is re-set to 0)
\(V_{max,G}\): Tangential component of the maximum gradient-level sustained wind speed (in m / s)
\(\phi\): Latitude, in decimal degrees
Any negative values of \(A\) are reset to 0.
Willoughby HE, Darling RWR, and Rahn ME. 2006. Parametric representation of the primary hurricane vortex. Part II: A new family of sectionally continuous profiles. Monthly Weather Review 134(4):1102-1120.