An extreme and exceptional rain system passed through our region starting the night of December 7–8, and primarily between December 10–12, at which point it was named "Byron" as part of the European project for naming significant storms. The system brought large quantities of rain, reaching amounts of 150 to 200 mm and more.

Some of the rainfall was highly intense, causing strong currents and flash floods in the Judean Desert streams and in the tributaries of the Lachish, Shikma, and Besor streams. Furthermore, urban flooding occurred, mainly in Yavne and Ashkelon, where rescue forces were required to rescue trapped individuals.

The heavy rainfall erased the precipitation deficit in many areas of the southern and western parts of the country, even leading to a significant surplus in some of them. In Gush Dan, the deficit was significantly reduced, whereas in the northern mountains, it was reduced only moderately.