It’s been a rainy day like any other we’ve had recently. A storm came through in the early evening and left Brooklyn a little cooler but a little more humid. The sun is setting now.

I’ve never seen anything like that. Here’s hoping a meteorologist specializing in cloud formation stops by.
Update: A friend writes that these are called “Mammatus clouds”. From Wikipedia:
…the mammatus cloud is generally poorly understood. Detailed observations of the cloud have been meager and usually occur only by chance, since mammatus do not pose a meteorological threat to society. However, scientists’ lack of understanding of the phenomenon exhibits that there are microphysical cloud processes that remain to be researched.
June 26th, 2009 at 8:44 pm
It’d be nice if a poet stopped by too! :)) Beautiful photo. Beautiful sky. Beautiful Brooklyn!
July 13th, 2009 at 8:26 am
Great photo!
December 29th, 2009 at 2:18 pm
Yes, mammatus-not very strong, but mammatus nonetheless.
See post:
http://nycgarden.blogspot.com/2009/06/post-tempest-mammatus.html