Just over 125 millimeters (4.9 inches) of rain falls Wednesday night and Thursday morning in the northern moshav, Shavei Zion, setting a new record for the amount of rainfall measured in a single day during September.
The last record was set in the Gush Etzion area near Jerusalem when 95.7 millimeters (3.76 inches) fell on September 12, 1932.
The rain is heaviest along the northern coastal plain, the Carmel, and the Western Galilee.
In the coastal city of Acre, 83.1 millimeters (3.27 inches) fell, and at Kibbutz Eilon in the Western Galilee, 12.5 millimeters (half an inch).
Further south, Herzliya in central Israel registers 4.4 millimeters (0.17 of an inch), and the city of Petah Tikva 2.7 millimeters (a tenth of an inch).
From Jerusalem southwards, and along most of Israel’s east, there is no rain at all.
In northern coastal Nahariya, local drainage problems in the Ga’aton stream cause flooding.
During the day, temperatures will begin to drop and will be lower than average. While rain might continue today, it is expected to weaken and to stop by the evening.
The Israel Meteorological Service is warning about high seas that are dangerous for swimming, with waves reaching up to 2 meters (6.56 feet) in some parts of the country. Thunderstorms, lightning, and strong winds are expected in northern Israel and northern and northeastern Samaria into the early afternoon.
However, in the southern Judean Desert, Dead Sea, and northern Arava, the forecast is for heat stress this afternoon.
The Haifa Municipality in northern Israel has banned swimming in the sea today to deal with dirty runoff water which typically ends up on the beaches after the first rain of the season.
Asked whether such early rain, likely to be followed by more hot weather, could influence wildflower flowering this year, botanist Yuval Sapir of Tel Aviv University, who runs the university botanic garden, tells The Times of Israel that September rain is not that unusual.
He says the first rains do not always stimulate germination, that where rainfall is very intense but short lived, the ground is unable to absorb it all, and that only part of the country has experienced heavy rain anyway.