It left scientists and locals stunned. The enormous blast lit up the sky in Russia's Sverdlovsk region on November 14 but no one seems to know exactly what it is.
36-Hour Precipitation Outlook
October 2014 goes down as hottest on record
With yet another month breaking all climate records so far, 2014 is on track to ...
Snow science: How did Buffalo see 65 inches?
Read what's behind these incredible, dangerous snow storms.
"The worst weather I have reported from"
For the first time as a reporter, I found myself stranded, and uncomfortable.