<http://schema.org/alternativeHeadline>
"Unseasonably warm temperatures across the U.S. allowed warm, moist air to collide with cold, drier air, priming the country for tornadoes."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/climate-weather/stories/march-tornadoes-are-years-first-billion-dollar-disaster>