It's called the Windsor Hum, and it's been going on in Windsor for a lot longer than days, and everybody knows where it's coming from. The specific source has yet to own up, but it will be identified eventually. Nothing natural or supernatural about it.
The MP who has agitated to get official attention to it is from the NDP. The Conservative government despatched one of its own to get to the heart of the matter.
http://www.cbc.ca/news/canada/toronto/story/2012/04/21/windsor-hum-dechert.html
Jim Bradley, Ontario's environment minister, sent letters to municipal, state and federal officials in the United States late last month, asking them to take action on the problem. The ministry has received close to 500 complaints about the noise, Bradley said.
Meanwhile, Dechert, the parliamentary secretary to Foreign Affairs Minister John Baird, has met with representatives of the Great Lakes Commission, the Council of Great Lakes Industries, the Southeast Michigan Council of Governments and the Regional Office of the International Joint Commission to discuss the problem.
... Testing has determined the sound is coming from the general vicinity of Zug Island, an industrial site on the U.S. side of the Detroit River (see map below).
Officials from the city of River Rouge, Mich., where Zug Island is located, have said they don't have the money to find the source of the noise.
Zug Island by night:
http://weinterrupt.com/2012/04/mysterious-hum-in-windsor-on-traced-back-to-zug-island-michigan/
Nice neighbours.