. >> john dumont is the science and operations officer at los service. >> can you talk a little bit aboutt's extreme events: it's the whole wardrobe. slickers. >> severe weatherents rain from did he havestrating extremes to record snowfall in north earn japan and widespread drought to lake-effect snow in the united states. shini samarra picks up the story story. >> all we need is cold air and warm water. >> november 17th, 2014, in a video that went viral, this time lapse shows the impact of lake-effect snow schu. highways. >> nicholas metz is a professor of geo science at hobart and william smith colleges in geneva new york. [i tell my students to imagine a balanced top of the moucht an. a push and that ball goes to the bottom of the moucht an. this is just the mountain flipped upsidedown, just a little push it produces lake-effect snow bands. >> it sounds like weather is becoming extreme? >> a lot of the research is show showing that as our globe starts to change, extremes may become the norm. >> so does science suggest that more? >> i think that's a reasonable seeing. >> when it's extre