As Tropical Storm Cristobal continued to intensify as it slowly moved northward east of the Bahamas a NOAA P-3 and G-IV 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 Cristobal sampled from the tail Doppler radar on the P-3 and within 450 km of Cristobal from the G-IV aircraft during the afternoon of 25 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 and G-IV Doppler patterns around Cristobal. Also plotted on each analysis are the locations of dropsondes deployed by the P-3 and G-IV (plotted using standard station symbols). These analyses show that Cristobal still had a very asymmetric distribution of precipitation at all altitudes, with the bulk of the precipitation surrounding the center and extending primarily in the southeastern semi-circle of the storm, particularly in the P-3 analyses. The G-IV analyses suggests that below 6-km altitude that the precipitation distribution is more symmetric around the center at radii >60-75 km, possibly indicative of eye formation. There is indication of a circulation center at 1-3 km altitudes, with stronger winds 65-70 km east-southeast of the circulation center at 1-km altitude, and extending to 100-120 km to south and east of the center at 3-6 km altitude (particularly evident in the G-IV analyses). From 1-3 km altitude the circulation center is tilted 10-15 km toward the east-southeast indicative of weaker westerly shear of the horizontal wind noted in the last mission.
All the Tropical Storm Cristobal radar composites at 0.5-km height resolution are available at http://www.aoml.noaa.gov/hrd/Storm_pages/cristobal2014/radar.html