The Precursors of High Rainfall Intensity During June in Southern Central Java: A Case Study of Flash Floods 18 June 2016 in Purworejo

High rainfall intensity during the dry season can cause floods and landslides that a lot of loss property life as happened in Purworejo. Generally, with little rainfall, heavy rain June is very rare, therefore disaster anticipation will be better if precursor identified. This research aims to obtain high-intensity precursors south Central Java, especially Identification used classifying for 10 years related atmospheric phenomena impact Indonesian variability. The results show there are evenly distributed, precursors, identified 3 days before incident such low OLR which value <150 Wm-2. Moreover, an analysis average incident, anomaly Java region between –20 –60 Meanwhile, vertical humidity profile more than 80% reached 500 mb level, well spots where temperature was 30.20C, three four 30.20C Indian Ocean adjacent southern part Island. Existing air pressure northern Kalimantan persists long time, support rains Especially wind speed decreases less 4 m/s occurs phases MJO.