The Tennessee Valley region of north Alabama and southern middle Tennessee received widespread snowfall on Christmas Day 2010, marking the heaviest–and in some cases the first–snowfall on record for Christmas Day. Any snow that melted on the afternoon of the 25th was replaced by so-called “wraparound” snow showers later on the 25th into the 26th, while temperatures stayed close to the freezing mark. This resulted in a snow pack that persisted several days after the event, compared to many events which see snow melt the same day. MODIS data from SPoRT aided in monitoring the melting of the snow pack.
First, the MODIS natural color and false color imagery from 1633 UTC on the 27th:
As temperatures rose into the 40s on December 28, the melting accelerated:
A slightly closer view of the normal visible imagery reinforced what we saw out our own back door:
The southwest-to-northeast oriented snow pack suggested by MODIS meshed well with reports received by NWS Huntsville, as indicated by this plotted and analyzed map on the WFO web page:
By December 29th, highs in the 50s melted any lingering snowfall.