Coincidentally, the National Oceanic and Atmospheric Administration (NOAA) has been accurately trackingthenumber of strong tornadoes for decades (weaker tornadoes are not accurately tracked, because older technology could not detect many of the smaller tornadoes that can be detected today).
The group relies on a network of Syria-based activists that have been trackingthenumber of dead, injured and missing since the Syrian conflict began in March 2011.