constant value of 80 mb pressure drop was assumed in most of these 

 parametric simulations. Nevertheless, one of the sensitivity tests, 

 which will be discussed later, was designed to verify this 

 relationship. 



Table 1 summarizes the possible combinations of these parameters 

 for the five selected paths including their designated hurricane 

 names for further discussions. Runs were made for a representative 

 subset of these model hurricanes (those identified by an * in the 

 last column) . This subset allows one to examine responses for 

 different paths for average hurricane parameters, as well as to 

 determine effects of forward speed and effects of scale. 



3. Simulation procedure 



The start up process for all parametric simulations is the same 

 as in the simulations of hurricanes of record. The model 

 calculations start at 0000 h on day 1 but end at different times 

 depending on the path and forward speed. However, in all cases the 

 computations proceeded to at least 24 h after landfall. 



Wind and pressure forcings are again computed at each time step. 

 Parameterizing the pressure drop instead of maximum wind speed 

 (including assuming k=l) simplifies the wind stress computations by 

 eliminating linear interpolations in space (azimuth) and time to 

 obtain k and Wjj^. Equation (75) is used to compute the wind speed 

 which is then augmented by the forward speed to account for the 

 asymmetry in the wind fields. The only information required to 

 compute the forcing is the position of the storm center which is 



104 



