Suddenly, a brook

It was very warm, around 30 C / 86 F, for several days and today the heat "erupted" (as it often does) with intense rain, thunder and apparently even with a little bit of hail. This brook formed on the hill in front of my parents' house. About 5 m / 15 ft. long branch also cracked and fell down from a maple by the vegetable garden. The temperatures dropped more than 10 C, but it's still fairly warm.