Statistical process control (SPC) is a method of quality control which employs statistical methods to monitor and control a process. This helps to ensure that the process operates efficiently, producing more specification-conforming products with less waste (rework or scrap).
The Storm Prediction Center (SPC) is part of the National Weather Service (NWS) and the National Centers for Environmental Prediction (NCEP). Our mission is to provide timely and accurate forecasts and watches for severe thunderstorms and tornadoes over the contiguous United States
As the name suggests, this means that there is an enhanced potential for dangerous weather compared to Slight Risk areas. The severe risk categories are determined by the SPC based on the threat for tornadoes, winds in excess of 58 mph, or hail. The base-line threat that storms will occur is a "Slight Risk."
A Slight Risk means scattered powerful thunderstorms are expected. While storms may be short-lived, they can be intense. Within the risk area, storms could produce tornadoes as well as isolated areas of wind or hail damage. An Enhanced Risk means numerous severe storms are expected over the risk area.