More Killer Tornadoes Strike at Night

Tornado warning systems have decreased deaths in the United States resulting from these destructive storms, but the alerts might be leaving us vulnerable to twisters that strike at night, a scientist now warns.  In the past century, tornado deaths have declined overall, in large part due to sophisticated forecasting technology and warning systems that give people in the path of a storm time to get to safety.  But a new study by Northern Illinois University found that the nighttime tornado death rate in the past 100 years hasn't kept pace with the decline in the rate for daytime tornadoes.

http://www.livescience.com/environment/081105-nighttime-tornadoes.html