witches brewing a storm

There are a lot of interesting stories about the ways in which witches manipulate the weather.  A few in Compendium Maleficarum:
*An 8 year old girl impresses her father by making it rain on the cabbage field.  She digs a hole, pees in it and stirs it around.  Ta-Da!
*Another woman causes a storm using a similar method, only utilizing water instead of urine.