Y = [(x - x ) 2 + (y - y ) 2 ] 2 , (H-5) 



Dp s p s 



where (x s ,y s ) is a point along the coast determined by the inter- 

 section of a line normal to the coast and passing through the point 

 in question (x„,yp). The sign convention is that Xq is positive 

 if the point in question is to the right of the hurricane track and 

 negative if it lies on the left. In general, the influence region 

 is defined by: 



Yj =[ FjCXp) + S f ] • R f , (H-6) 



where Fj is the influence function of Xp , Sf is a shift factor 

 which permits the influence line to be moved normal to the coast, 

 and Rf is a range factor. The influence function attempts to re- 

 late the degree of distortion in the wind isovels relative to the 

 tract of the hurricane and the shape of the coastline. The extent 

 of the land influence is given by Yj , which depends on Sf and 

 Rf . These coefficients as well as Df are considered to be 

 related to the distance of the hurricane from the point where it 

 crosses the coast. 



Additional investigation is required to establish a generalized 

 procedure based on physical principles for deforming the winds in a 

 manner which faithfully reproduces the observations. Consequently, 

 each storm is parameterized individually to accomplish the task. The 

 relationships used for deforming the winds of Hurricane Carla are: 



F I = I X D " \ l /7 ' (H_7) 



D £ = .IT 1 + e- 05 W 2 > 2 ] , (H-8) 



S f = h[ .5 - i tan" 1 (D h /2iy] R^ , (H-9) 



r 1.5 > ifD h<- 5 \ 



R f =\ _ _ (H-10) 



{ .5 + e-° 25 (VV 5 ) 2 ' i£D h> 5R h 



where R, is taken as approximately 37 kilometers and 



D h = ± [ (x c - x h ) 2 + Cy c - y h ) 2 l % • (H-ii) 



The sign convention is that D^ is positive if the hurricane is over 

 water and negative if the storm is over land. For Hurricane Camille, 



161 



