A joint research team in the University of Al-Mustansiriyah, Catalonia Technical University and the Spanish Center for Marine Sciences was able to complete a scientific study on extreme rain phenomena over Iraq. The joint team reviewed the temporal variations of the precipitation that causes heavy rainstorms and the Dynamic and thermodynamic sources operations of humidity are necessary for such extreme events to occur, especially the rainstorm that occurred in Baghdad on 19th of November, 2013. The joint team highlighted that the study demonstrated that there are 20 sever rain conditions in Baghdad, supported by a horizontal gathering of high quantities of moisture coming from the Red Sea and the Arab Gulf, as well as the huge blowing of air instability processes in stimulating the atmosphere to reach this condition during the days of heavy rain with relatively short time (1-2 days) compared to other cities where the phenomenon takes a week or more. It is worth mentioning that the study based on the data of the Iraqi General Authority for Weather and Seismic Monitoring, ECMWF, British Meteorological Center and the satellite imagery as well as using the American model (HIPSBL) to map the path of the air masses connecting to Iraq, calculating the equivalent voltage temperature, vertical moisture overflow and purify-able water for sedimentation, atmospheric instability coefficients, vertical velocity mapping, horizontal wind collections and the time taken by air mass bearing moisture to reach Iraq.