It seems like some of my plants go through phases. First, I have a lot of blossom drop, then they set a bunch of tomatoes, then they go through a blossom drop phase again while the tomatoes are maturing. If I'm lucky, there will be more tomatoes set if the growing season is a long one.

Given the unusual heat wave, even the folks in the far northeast are likely dealing with it. Unusual for them perhaps but Blossom Drop is pretty standard in many parts of the country this time of year.

Dave

kjameswv,
I too live in Pittsburgh and have had identical results. My cherry tomatoes are seting fruit just fine. But, my beefsteak and other larger tomatoes keep producing fruitless flowers. I'm blaming it on the heat.