A multi-day severe weather outbreak, including tornadoes, will ramp up Wednesday through Thursday in parts of the South and Midwest. Some severe weather may continue into Friday along the East Coast and South. This has the potential to be the most widespread severe weather event so far this spring.
Meteorologists use pattern recognition, or the general forecast orientation of upper-air and surface weather features, to help identify the potential for high-impact weather events – severe weather outbreaks, winter storms, cold air outbreaks and heat waves – several days out.
The pattern this week has some similarities to a classic heartland spring severe weather outbreak.
First, a bullish southward plunge of the jet stream, or trough, will swing out of the western U.S. into the Plains and Midwest.
In the atmosphere's lowest levels, progressively warmer and more humid air has arrived from the Gulf of Mexico into parts of the Plains and Mississippi Valley.
With that vigorous jet stream overlapping warm, humid air and surface features – such as a drylines that divide High Plains dry air from more humid air to the east – and a warm front helping to lift the unstable air, the stage is set for a potential outbreak of severe thunderstorms with large hail, damaging winds and tornadoes.
http://www.weather.com/storms/tornado/news/severe-weather-tornado-outbreak-forecast-midwest-south-apr-2015
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