A very interesting chart via Bloomberg's @M_McDonough showing the growing weakness in US Manufacturing:
Local max at November-December 2014 is now being eroded, although ISM is still reading reasonably above 50.
This is just another confirmation of some (early) signs of the US economy shifting toward 'mature expansion' stage of the cycle. Given that all of this is still based on two exogenous factors: the hang-over of lower capex costs and low energy costs, the signal is not good - slowing economy into the Fed rising reversal that might coincide with firming of oil prices in H2 2015 will be a tricky risk to manage.
Note some other data points relating to the slowdown in growth signals: http://trueeconomics.blogspot.ie/2015/04/2415-oh-someone-spotted-us-growth.html.