The water temperature in summer is over 30 degrees. This is favorable for the formation of a tropical cyclone. From autumn to spring, the water temperature is higher than the air temperature. This is favorable for the formation of a tropical cyclone. The type of atmospheric circulation is anticyclonic. This is favorable for the formation of a tropical cyclone. The width of the Red Sea is more than 300 km and it is more than the diameter of the convective cell that transforms into a vortex. The salinity of the water in the Red Sea and in the Persian Gulf is much higher than usual. Maybe this is the problem? It is known that salt water evaporates worse than fresh water.