Strange 'breast clouds'

It looks as if it was made with Photoshop or something, but it is a natural phenomenon. There seems to be sometimes seen in Japan, but there is nothing extreme so far. Because this "breast cloud" seems to be "a forerunner of tornado" in America. If you find this cloud, it seems that you have to run away to the hut and so on from anywhere. In Japan it is a forerunner of sudden rain, thunder, gust of wind. Remember, there is no loss.

Other photos are here.
June 2004 hastings-mammatus
http://hprcc.unl.edu/nebraska/june2004hastings-mammatus.html

It seems that it will be like this after a while.

Summer 2004 photos 1
http://www.hprcc.unl.edu/nebraska/summer2004photos1.html

Pictures can be purchased on the page of those who took this picture.
http://www.jornolsen.com/

In Japan, there is a shooting example like this.

Today's NASA Space Image Planet Tera talks record Mexican breast clouds 2004/06/07
http://the-cosmos.org/2004/06/2004-06-07.html

Breast cloud profile - Aozora ☆ Metal
http://wapichan.sakura.ne.jp/mam.htm

June 27, 2005 Breast Cloud - Aozora ☆ Mega
http://wapichan.sakura.ne.jp/sky-mam0627.htm

Breast cloud Part 1
http://homepage1.nifty.com/albedo-kobayashi/cloud-tibusa-1.htm

Breast cloud Subvariant cloud classification
http://saizou.3.pro.tok2.com/bunrui/fhen-nyubou.htm

The bottom of a cumulus cloud
http://www.pluto.dti.ne.jp/~suzuki-y/tokai/tokai10.html