The last 30 hours brought some of the largest run-to-run model changes in the last decade, partially due to weaker than expected thunderstorm activity in the Deep South yesterday. Since that convection did not occur, heights did not increase as much on the East Coast. And higher heights equal a more north storm track, vice versa. Here we sit, about 10 hours away from the onset of precipitation as this forecast is being written. Timing has changed for changeover times, and snowfall accumulations have drastically shifted southward. Let’s be clear, the boom & bust potential with this storm and this forecast is high.