will7a: Calculate radius of maximum winds

In stormwindmodel: Model Tropical Cyclone Wind Speeds

Description

Calculates the radius at which the maximum wind occurs (Rmax), based on the maximum gradient-level 1-min sustained wind (vmax_gl) and latitude (φ). This function implements Willoughby et al. (2006), Equation 7a.

Usage

will7a(vmax_gl, tclat)

Arguments

vmax_gl	Numeric vector of the tangential wind component of the maximum gradient wind speed, in meters per second
tclat	Numeric vector of the absolute value of latitude, in degrees.

Details

This function fits the following equation:

Rmax = 46.4 e^(- 0.0155 vmax_gl) + 0.0169φ

where:

• Rmax: Radius from the storm center to the point at which the maximum wind occurs (km)

• vmax_gl: Tangential wind component of the gradient-level maximum wind speed (m / s)

• φ: Latitude (degrees)

Value

A numeric vector with Rmax, 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.

stormwindmodel documentation built on July 27, 2020, 9:06 a.m.