Calculates A, a paramter for the Willoughby wind model, using equation 10c (Willoughby et al. 2006).
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.
This function calculates A using equation 10c (Willoughby et al. 2006):
A = 0.0696 + 0.0049 vmax_gl - 0.0064 φ
A: Parameter for the Willoughby wind model (any value of A calculated as negative is re-set to 0)
vmax_gl: Tangential component of the maximum gradient-level sustained wind speed (in m / s)
φ: Latitude, in decimal degrees
Any negative values of A are reset to 0.
A numeric vector that is a parameter required for the Willoughby model.
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.
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