In the area of Mezad Zohar and the whole of the Negev and Arava desert you will have flash floods during the rainy season. The entire southern desert of Israel is made up of a mountainous desert that is composed primarily of rock and very fine earth...exposed rocks in the canyons of course do NOT absorb water and this type of soil, once it absorbs a very small amount of water becomes impervious to water also. So between the these two elements you have the recepie for flash floods. It rains in the western and higher plains of the desert and all the water collects from all the various dry riverbeds, running toward the lower area between Israel and Jordan, along the Syrian-African Rift bed, running from Syria in the north all the way through Israel, the Red Sea and into Africa. One minute the road you are on is dry, not a cloud in the sky and then all of a sudden you can encounter a wall of water.. you can see in these pictures the damage that can be caused.