add_forward_speed       Adds forward speed component to modeled surface
                        wind
add_inflow              Add inflow angle
add_storm_track         Plot Atlantic basin hurricane tracks
add_wind_radii          Add Willoughby inputs and parameters
calc_R1                 Calculate radius to start of transition region
calc_and_summarize_grid_wind
                        Calculate and summarize grid winds
calc_bearing            Calculate bearing from one location to another
calc_forward_speed      Calculate storm's forward speed
calc_gradient_speed     Convert symmetric surface wind to gradient
                        wind.
calc_grid_wind          Calculate wind speed at grid points
check_over_land         Determine if storm is over land or water
county_points           Eastern U.S. county latitude and longitudes
create_full_track       Impute hurricane tracks to finer time scale
degrees_to_radians      Convert from degrees to radians
floyd_tracks            Hurricane Floyd tracks data
get_grid_winds          Determine hurricane winds at locations
gradient_to_surface     Calculate surface wind speed from gradient
interp_track            Interpolate a storm track
katrina_tracks          Hurricane Katrina tracks data
landmask                Land-sea mask
latlon_to_km            Calculate distance between two locations
map_wind                Map wind exposure at the county level
radians_to_degrees      Convert from radians to degrees
remove_forward_speed    Remove forward speed from maximum wind speed
solve_for_xi            Numerically solve Willoughby Eqn. 3 for xi
summarize_grid_wind     Generate wind summaries for grid point
will1                   Model wind speed at a grid point for a storm
                        track observation
will10a                 Calculate X1 for Willoughby model
will10b                 Calculate n for the Willoughby model
will10c                 Calculate A for Willoughby model
will1a                  Willoughby et al. (2006), Equation 1(a)
will2                   Willoughby et al. (2006), Equation 2
will3_deriv_func        Calculate the function value and derivative for
                        Willoughby Eqn. 3
will3_right             Calculate right-hand side of Willoughby Eqn. 3
will7a                  Calculate radius of maximum winds
