Ice and snow storms are crippling some states in the Southeast . Ian Roulstone : Predicting how much snow will actually accumulate is difficult . The National Weather Service has a model that predicts snowfall based on wind speed, temperature and humidity levels. On the other hand , if there is abundant moisture and the snowflakes are larger and wetter , a ratio of 1 to 5 may be typical . Roulstone : Making the final call comes down to `` seat of the pants '' knowledge in the end .
Ice and snow storms are crippling some states in the Southeast . Ian Roulstone : Predicting how much snow will actually accumulate is difficult . The National Weather Service has a model that predicts snowfall based on wind speed, temperature and humidity levels. Roulstone : Making the final call comes down to `` seat of the pants '' knowledge in the end .