From one extreme to another: After a heatwave descended on the country in recent days, Israel was hit with thunderstorms and a significant decrease in temperatures Wednesday evening, a highly unusual occurrence for mid-May.

The rains were expected to continue through Thursday, and flash floods were already reported in southern Israel’s desert valleys by nightfall.

The Paran and Tze’elim rivers in the south overflowed onto highway 90 Wednesday evening. Police warned the public to avoid all riverbeds and channels in the south, which could flood with very little warning.

The Jerusalem municipality released a statement Wednesday evening saying it expected up to 50 millimeters of rain to fall within the next 24 hours. It also warned residents to take care when driving and to avoid any activities which could be dangerous in the current weather.