On 27 April 2026, heavy rainfall fell in southern and eastern Israel from the noon hours through the afternoon. This occurred due to atmospheric instability accompanied by moisture in the mid-levels, under a synoptic situation involving an upper-level low with cold air in the upper levels of the atmosphere in combination with warm air in the lower levels. The storm clouds developed rapidly over the eastern slopes of the Judean Mountains and the northern Negev and produced, within a short time, tens of millimeters of rain, as well as heavy hail that covered the Kana'im Valley area (northeast of Arad) with a white layer. The abundant precipitation caused significant floods in some of the streams of the Judean Desert and the eastern Negev. The most significant rainfall intensities were observed along the boundary between the catchment basins of Nahal Ze'elim and Nahal Rahaf; consequently, an exceptional peak discharge of more than 500 m³/s was recorded, a value that had never previously been measured in Nahal Ze'elim.