1.   Altitude plays a part in producing this snow, and so does geography.

2.   A complex storm over the southern Rockies will produce snow in the higher terrain of western Colorado and in the Four Corners area.

3.   A disturbance developing in Texas will produce some snow in the southern Rockies and an expansive area of clouds in the southern Plains.

4.   A large disturbance over the Rockies will produce heavy snow.

5.   A moisture-starved disturbance will produce scattered snow in the northern Mississippi Valley and a few rain showers in the western Ohio Valley.

6.   A potent area of low pressure moving across the south-central Rockies will produce mountain snows Monday.

7.   A potent disturbance in California will produce heavy snow in the northern Sierra and gusty showers farther south.

8.   A rapidly strengthening area of low pressure along the East Coast will produce snow from interior New England to eastern Pennsylvania Monday.

9.   A second disturbance over western Kansas will produce heavier snow in parts of central Colorado with snow showers farther south.

10.   A strengthening disturbance will produce intermittent snow over the northern Rockies.