Thursday is more about earnings: after market close brings American Express (AXP), and Google (GOOG).
We look to Friday, April 18th as a "naked" economic day in terms of data. So the open will be dictated by earnings from UTX, AXP, and GOOG. We suspected a very volatile day with a downward bias, but now have turned decisively bullish. The earnings after market close come from Caterpillar (CAT), and Citigroup (C).