  The impacts of a tropical cyclone after landfall depend not only on storm
intensity but also on the size and structure of the wind field. Hence, a simple
predictive model for the wind field after landfall has significant potential
value. This work tests existing theory for wind structure and size over the
ocean against idealized axisymmetric landfall experiments in which the surface
beneath a mature storm is instantaneously dried and roughened individually or
simultaneously. Structure theory captures the response of the low-level wind
field to different types of idealized landfalls given intensity and size
response. Storm size, modeled to follow the ratio of simulated time-dependent
storm intensity to the Coriolis parameter vm(t)/f, can generally predict the
transient response of the storm gale wind radii r34kt to inland surface
forcings, particularly for at least moderate surface roughening regardless of
the level of drying. Given knowledge of the intensity evolution, the above
results combine to yield a theoretical model that can predict the full
tangential wind field response to idealized landfalls. An example application
to a real world landfall is provided to demonstrate its potential utility for
risk applications.

Atmospheric and Oceanic Physics