I’m still digging out from the big storm this weekend in Washington, DC. I received 24″ at my house, ranged from 14″ to over 30″ in the metro area with heaviest around Columbia, Maryland. I worked during the storm and Laris and I tallied the NWS weather spotter reports of snowfall and used the GIS to krig the a map of average depth from about 50 points (which had to be filtered to remove expired values). Then used Illustrator’s Live Trace functionality to vectorize. Preview above (for the local home page promo which didn’t have room for legend, so directly labeled the contours), full graphic below with explainer of how the storm happened (with Laura and Larry).