Monitoring the variability of precipitable water vapor over the Klang Valley, Malaysia during flash flood

摘要: Klang Valley is a focal area of Malaysian economic and business activities where the local weather condition very important to maintain its reputation. Heavy rainfalls for more than an hour were reported up 40 mm in September 2013 35 October 2013. Both events are monitored as first second cases flash flood, respectively. Based on these cases, we investigate water vapor, rainfall, surface meteorological data (surface pressure, relative humidity, temperature) river level. The precipitable vapor (PWV) derived from Global Positioning System (GPS) used indicate impact flood rainfall. We found that PWV was dropped 4 2 hours before rainfall reached 3 respective cases. Variation higher case compared about mm. suggest phenomena can disturb GPS propagation therefore, before, during after event at three selected stations investigated possible mitigation future.