Using Wind Profiler Radar to Identify Cumulonimbus at Lombok International Airport’s Area

Cumolonimbus became one of the threat for airport activities. The presence of individual cumulonimbus cell were difficult to predict. Cumulonimbus cloud is a convective cloud or cloud system that produces rainfall and lightning. It often produces large hail, severe wind gusts, tornadoes, and heavy rainfall.Wind Profiler Radar utilizes Doppler radar working principle, this tool is used as a tracer variation of the refractive index of air caused by turbulence. This study uses data Wind Profiler installed in Lombok International Airport at January 27th, March 24th, April 3rd, and July 17th in the year of 2016. This research analyze data from wind profiler so the forecaster could recognize the cumulonimbus using WPR and discover the initial sign of cumulonimbus for further information the the flight officers. Wind profiler clearly captured the emergence of cumulonimbus on the parameters Max (dbz) with a range of value (-15) – (20) dBZ. A windshear at low level caught as an initial sign of cumulonimbus emergence. When cumulonimbus exist, horizontal wind speed at the troposphere increased, and there is a convergence activity at low levels and divergence in high levels. The value of cumulonimbus’s multipeak coeff display in contrast to when the weather is clear. Multipeak coeff’s point at the cumulonimbus case has random pattern and higher wind speed yet multipeak coeff’s point at the clear weather close to zero