The 2001 Hurricane Field Program is the fourth year of a renewed effort to unravel the mysteries of these devastating storms under a multi-agency (DoD, NASA, NOAA, and NSF) effort over the next 5-6 ye ars. USWRP is focused on the reduction in the impacts of disastrous weather on the nation, in particular hurricane landfall. The addition of CAMEX-4 (Fourth Convection and Moisture Experiment) to the NOAA hurricane research program under the USWRP Hurricane Landfall Experiment 2001 (HL2001) represents the first major field program under this interagency cooperation.