Monday, June 29, 2009
thanks to serena of dreamswiththefishes
for finding out that these were Mammatus clouds.
According to Wikipedia:
Mammatus (also known as mammatocumulus,
meaning "bumpy clouds") is a
meteorological term applied to a
cellular pattern of pouches
hanging underneath the base of a cloud.
The name "mammatus" is derived from
the Latin mamma (udder),
due to the clouds' characteristic shape.