Meteorological Analysis of Flash Flood in Istanbul on 18 July 2017

It is known that flash floods are one of the main natural hazards that occur on the earth. To minimize the probable risks occurring by the flash floods, analyzing and predicting of mezoscale convective systems are quite important. In this study, meteorological analysis was investigated for the Istanbul flash flood on 18 July 2017. In addition to the interaction between Azor High-Pressure Center and Island Low-Pressure Center, the position of high low center over Istanbul transferred high amount of moisture to the region by Aegean and Marmara Seas. Transferring of moisture from low to high levels by strong vertical winds increased the instability conditions (K index=36.6) caused severe precipitation events in the morning times of the day (44.0 mm in one hour in Beykoz) and negatively influenced the economic and social life of the city