As Tropical Storm Bertha strengthened as it passed east of the Bahama Islands a NOAA P-3 mission collected airborne Doppler radar data to use in initializing and evaluating model guidance. Included here you see images of the horizontal winds within 300 km of Bertha sampled from the tail Doppler radar on the P-3 aircraft during the early morning of 4 August 2014. These images are at three altitudes (1 km, 3 km, and 6 km) and are a composite of winds from the P-3 Doppler pattern around Bertha. Also plotted on each analysis are the locations of dropsondes deployed by the P-3 (plotted using standard station symbols). These analyses show that Bertha had a very asymmetric distribution of precipitation at all altitudes, with the bulk of the precipitation surrounding the east semicircle around the center and extending toward the east. There is indication of a circulation center at all altitudes, with winds of hurricane strength 30-35 km east-northeast of the circulation center, and a secondary wind maximum 150 km east-northeast of the center. From 1-6 km altitude the circulations center is only slightly tilted (5-10 km) toward the east indicative of the storm intensifying as the westerly shear relaxed.
All the Bertha radar composites at 0.5-km height resolution are available at http://www.aoml.noaa.gov/hrd/Storm_pages/bertha2014/radar.html