** FILE ** An elementary school student is walked to class as a spring storm dropped snow over Boulder, Colo., Tuesday April 23, 2013. (AP Photo/Brennan Linsley)

Photo by: Brennan Linsley

** FILE ** An elementary school student is walked to class as a spring storm dropped snow over Boulder, Colo., Tuesday April 23, 2013. (AP Photo/Brennan Linsley)