Jeddah has suffered from terrible floods twice. In 2009 the flood disaster was described as one of the worst to hit the region in over 25 years after more than 9cm of rain fell in just a 4 hour period.
In 2011 Jeddah was struck again when 11cm of rain fell in 3 hours in late January. Rescue teams, including helicopters, were called into operation and helped rescue nearly 1,500 people. Shelter and relief was necessary as more than 1,500 families were made homeless as a result of the flooding.
You may not be able to stop an oncoming flood or disaster, but you may be able to mitigate some of its damage by knowing what to do before, during and after.
In any case, stay indoors. Stay safe.