REUTERS/Yuri Gripas
Yellen's comments are set to be delivered before the Greater Providence Chamber of Commerce.
In a note earlier this morning, UBS' Art Cashin cautioned that Yellen could use the speech as a sort of trial balloon to see how the markets react if Yellen strikes a more "hawkish" tone, or indicates that the Fed could be quicker to raise interest rates.
The Fed has kept rates near 0% since December 2008 and hasn't raised rates since July 2006.
Ahead of the speech, stocks were mixed, with the Dow down about 45 points, the S&P 500 down about 2 points, and the Nasdaq up 3. The US dollar, meanwhile, was rallying.
We'll be back with the full speech, the most important breakouts, and any market reaction when it drops.