This magic "recession detector" series comes courtesy of a pair of researchers that after doing a whole bunch of incomprehensible math came up with a formula that seems to tie in four indicators that, taken together, seem to be able to predict in real time where the US economy will go. Read more about it here. Perhaps most importantly, see how closely synchronized the movements of the DJIA is with the various indicators.
Note that the definition of "real time" here is in the 3-month timeframe, since the series they use only updates that often. Still that beats the BEA's GDP series, which comes out with revision after revision, and thus is said to accurately predict recessions perhaps a year after they've already happened.