“We joke here on the desk that it's safe to buy stocks for 10 minutes. Then it's going to sink back to the fact we could be going to war, the strike is still on, the economic numbers are still bad,” said Andrew Baker, a senior Nasdaq trader for Wedbush Morgan. “No one has any conviction in these rallies.” (from yahoo! finance.)

(i would clarify that it's not a strike, it's a management lockout.)