On 15 September, 1999, as part of the Hurricanes at Landfall component of the US Weather Research Program, the Hurricane Research Division of the National Oceanographic and Atmospheric Administration (NOAA) conducted two single-plane experiments in Hurricane Floyd with P-3 aircraft from NOAA's Aircraft Operations Center (AOC). The flight patterns were intended to survey the vortex and it's environment as it made landfall on the North Carolina coast.

Each aircraft executed passes along the coast and GPS sondes were dropped to sample onshore and ofshore flow regimes. There was also a portable Doppler on Wheels (DOW) deployed near Wilmington and the NOAA aircraft flew near the DOW to collect Doppler data for dual-Doppler analyses.

We have Doppler data collected along the coast for ~7 h, so we will be able to describe the wind field evolution from several radar analyses. We will present the dual-Doppler reflectivity and wind fields, and relevant GPS sonde data to evaluate changes in the winds as the hurricane crossed the coast, with an emphasis on contrasting onshore and offshore flow regimes.