Mine apparently had a nutritional deficiency. I fed them 10-10-10, Miracle Gro Bloom, Miracle Gro Shake and Feed Tomato since I started the thread in the Diseases subforum. The weather cooled off some. We had torrential rain and t-storms, strong winds, and even hail. But the plants are bouncing back. See thread for before / after pics.
http://www.tomatoville.com/showthread.php?t=42497
WalMart had all their fertilizers on sale 1/2 price and then 1/2 off of 1/2 at some stores last week. But some other Walmarts didn't reduce their stuff at all. The 10-10-10 is granules, and might still be in stock. It's cheap even if it's still regular price. Walmart has 10# bags for only $1 at some stores now! I tried to stay "organic" but, y'know, I've got so many big containers of heavy feeders that I added "any fertilizers that were 1/2 price" to my approved list after realizing how much growing season remains and how bad my plants were starving. lol