Raindrops falling on a river, etc., and raising large bubbles, mean a heavy fall of rain and a flood.
Superstition #1033
Source: Current Superstitions (1896), entry 1033.
Fanny D. Bergen, editor.

Raindrops falling on a river, etc., and raising large bubbles, mean a heavy fall of rain and a flood.
Source: Current Superstitions (1896), entry 1033.
Fanny D. Bergen, editor.