One thing Yellen could say that may worry markets By: CNBC.com News February 26, 2014 at 16:39 PM EST Yellen testifies before the Senate Banking Committee Thursday and if she decides to stop using the weather as an excuse for a down economy, watch out. Read More >> Related Stocks: AMC Networks Cl A Best Buy Gap Monster Beverage Rowan Companies Sentinelone Inc Cl A Sotheby's Holdings Southwestern Energy Splunk Inc Sprouts Farmers Market Wendys Company