calc_R1: Calculate radius to start of transition region

In stormwindmodel: Model Tropical Cyclone Wind Speeds

Description

Once you've solved for ξ, this function uses this value and the estimated Rmax to determine R1, the radius from the storm center to the start of the transition region.

Usage

calc_R1(Rmax, xi)

Arguments

Rmax	Numeric vector of the radius at which the maximum wind occurs, in kilometers
xi	A numeric value with the ξ value determined by solve_for_xi

Details

This function is calculating the equation:

R1 = Rmax - ξ(R2 - R1)

where:

• R1: A parameter for the Willoughby wind model (radius to start of transition region)

• Rmax: Radius (in kilometers) to highest winds

• R2 - R1: Width of the transition region. This is assumed to be 25 kilometers if Rmax is greater than 20 kilometers and 15 kilometers otherwise.

Value

A numeric vector with the estimated value of R_1, a parameter required for the Willoughby wind model.

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.