5:30pm: We were in solid buy territory as I began typing the message below. The thought did not even cross my mind that we could lose the buy signal, but that's exactly what happened. So unfortunately I screwed up. My system said to hold the short position. I will be going short again tomorrow to get in line with my system, though I will have to use extra caution to avoid for the 4 round trips rule. Sorry for the mix up. As a bit of confirmation, the VXX closed up while VIX was down. Statistically this is bearish for the short term. This is not part of my system, but it's something I keep an eye on... Again, sorry for the confusion.
3:37pm: The system is exiting shorts and switching to a 50% long position on the close. The late day strength has weakened the buy signal considerably. It was a strong buy signal when we were at the lows today. While the system goes to 50% long TNA, I'm going to take a smaller position and wait for a possible retest of today's lows before buying more.