Exodus 14:21 & 22

Then Moses stretched out his hand over the sea. The Lord drove the sea back by a strong east wind all night, and turned the sea into dry land; and the waters were divided. The Israelites went into the sea on dry ground, the waters forming a wall for them on their right and on their left.

In this narrative the strong wind parted the sea to enable the Israelites to cross safely while the pursuing Egyptian soldiers were drowned when they attempted to cross. In north east Egypt and the eastern Mediterranean the east wind comes from desert or mountain regions. It is an arid, withering wind, very hot in summer and very cold in winter.