Caught a case of the bad weather blues? If so, you aren't alone. Severe winter weather is rearing its ugly head across the country and chilling the U.S. economy. So far this month, four of six major economic reports have cited the harsh winter as putting the damper on output and sales. Three of the four reports blaming the weather came in worse than expected. (Read more: Is winter weather really burying the economy?) Here's a look at weather references in recent reports. January ISM manufacturing This report disappointed when it was released Monday, registering at 51.3 versus economists expectations...