Storm Clouds

Storms can pop-up quickly.  Saturday I was on lunch break when I noticed the skies were starting to get dark.  I grabbed my IPhone and ran outside to snap a photo.  About 30 seconds later it rained like crazy.  It's not been a really dry season this year.  We can always use more.
The following photo was taken with IPhone 4s.  No added filters.

(click on photo for larger view)