uhf radar observations of monsoon low-level jet

Three-year UHF radar wind observations have been utilized to characterize Low Level Jet (LLJ) features over Gadanki (13.5N, 79.2E). Boreal summer monsoon seasonal winds show conspicuously strong westerly LLJ features with average wind speeds exceeding 20 ms^-1. Strong wind shears are normally located beneath of the LLJ. Low-level wind speeds show diurnal variation with maximum intensity during early morning hours. Daylong strong westerly LLJ has been observed on a few occasions during active monsoon periods. Diurnal oscillation of this LLJ axis has been observed to be varying in height region 1.8± 0.6 km with maximum elevations seen during afternoon times. Jet core (wind maxima) heights coincide with inversion height. Associated effects of monsoon LLJ on local turbulence and boundary layer evolution are discussed. It is quite interesting to know that the eddy dissipation rate on the strongest monsoon LLJ day is about ∼ 30 times stronger than the week jet day. Further emphasis is on wave future modification due to monsoon LLJ is going to present.