Corrected for a vertical airspeed of 0.3–0.7 m s −1 the corrected drop diameter of 2.5 mm is close to the derived fall speed value for distrometer data (○). The dash–dot line is the fall speed profile for a raindrop of 2.3-mm diameter. Particle fall speeds derived by EVAD analysis of radar volume scan data, commencing at 1944 LT on (solid line). The vertical lines highlight the period 1840–1850 LT from which the average derived fall speed value is calculated for Fig. Each dot represents a drop, indicated by its diameter, impacting at the indicated time. For this and subsequent figures all nonradar fall speeds are calculated using the equations of Beard (1976).ĭisdrometer data for the period 1823–1913 LT on. The “○” indicates the derived fall value for the raindrop spectra measured by the disdrometer. The “+” indicates the height and derived fall speed value for raindrop spectra measured by the aircraft 2-DP probe. The dash–dot line is the fall speed profile for a raindrop of 2.0-mm diameter. Particle fall speeds derived from Doppler radar data acquired at an elevation angle of 70° (solid line) beginning at 1844 LT on. The first and third lines are from the 2-DP probe and the other two lines are from the 2-DC probe. Sample images from the aircraft-mounted PMS 2D probes. Each line represents one elevation angle: (a) hodograph representation, (b) wind speed profile, and (c) wind direction profile.Ī sample VAD representation of Doppler radar data taken at constant range for elevation angles of (a) 5° and (b) 75°. A sample VAD evaluation of horizontal winds for Doppler radar data taken at 15 elevation angles ranging from 5° to 75°.