What is a nocturnal tornado? Weather experts say it's twice as deadly

(NEXSTAR) – A large swath of the midwestern and eastern United States is expected to be at risk for storms beginning on Friday evening, with more severe weather such as hail and damaging winds likely for certain regions. But the National Oceanic and Atmospheric Administration (NOAA) had also warned on Thursday of possible “nocturnal tornadoes,” a weather phenomena known to be particularly dangerous.Nocturnal tornadoes, as the name suggests, are tornadoes that occur overnight. G