will7a: Calculate radius of maximum winds

In geanders/stormwindmodel: Model Tropical Cyclone Wind Speeds

Calculate radius of maximum winds

Description

Calculates the radius at which the maximum wind occurs (R_{max}), based on the maximum gradient-level 1-min sustained wind (V_{max,G}) and latitude (\phi). This function implements Willoughby et al. (2006), Equation 7a.

Usage

will7a(vmax_gl, tclat)

Arguments

vmax_gl	Maximum gradient-level 1-min sustained wind for the tropical cyclone
tclat	Numeric vector of the value of latitude, in degrees.

Details

This function fits the following equation:

R_{max} = 46.4 e^{- 0.0155 V_{max,G} + 0.0169\phi}

where:

• R_{max}: Radius from the storm center to the point at which the maximum wind occurs (km)

• V_{max,G}: Tangential wind component of the gradient-level maximum wind speed (m / s)

• \phi: Absolute value of latitude (in decimal degrees)

Value

A numeric vector with R_{max}, the radius of maximum winds, in kilometers.

References

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.

geanders/stormwindmodel documentation built on Feb. 10, 2025, 11:58 a.m.