Global Warming CAUSES Snow

Last night in the lovely City of Walnut Creek(and Danville) it snowed. It hasn't snowed at city level since most folks can remember. It rarely goes below freezing. Snow does accumulate on top of Mt. Diablo at 3000 feet and above and at homes in the upper hills but last night was extraordinary. A neighbor of mine reported 1 inch of snow on her car. She's been here for 12 years and this is the first time it's snowed.

I know this is scientifically naive to state but what happened to global warming?