With metro Atlanta expecting a rainy last weekend of 2019, other parts of the nation are under deluge from a powerful winter storm making its way from California to the Upper Plains.

The National Weather Service said a trough situated over the desert Southwest on Friday morning is behind a surface low-pressure system moving eastward. That low-pressure system is forecast to become a powerful winter storm stretching from eastern Colorado to Minnesota.

»Your local forecast

Winter storm watches are in effect across these areas, with the potential of 6 inches to 12 inches of wind-blown snow from northern Nebraska to southeastern North Dakota. Blizzard conditions are likely for some of these areas.

Heavy snow is also expected for the central Rockies.

9. A polar vortex in late January was blamed for at least 27 deaths. 8. At least 23 people were killed by a powerful tornado that ripped through Alabama on March 3. 7. The second "bomb cyclone" in less than a month froze the central United States on April 10. 6. On May 27, a swarm of tornadoes tore across Indiana and Ohio. 5. A 6.4 magnitude earthquake hit Southern California on July 4th, causing millions in damage. 4. In mid-July a stifling heat wave gripped two-thirds of the country. 3. On September

The storm has already unleashed downpours and extensive snowfall on Southern California, triggering a tornado and snarling post-Christmas travel on major routes Thursday, according to The Associated Press.

Snow shut down Interstate 5 in Tejon Pass north of Los Angeles and stopped traffic elsewhere on the busy highway.

A truck driver was found unresponsive in a rig stopped along the pass. It was not immediately known if the death was weather-related.

Farther to the east, a corridor of freezing rain and sleet is expected from eastern Nebraska to northern Wisconsin. The potential exists for significant ice accumulation from a prolonged period of freezing rain, perhaps greater than a quarter-inch of ice.

»Atlanta weather: Current radar, hourly and 7-day forecast

Rain is expected in the warm sector of this storm, with rainfall up to an inch possible across the Midwest.

»Travel weather: Check forecast for any US city

Scattered showers and a few storms are likely for Florida, with a sustained period of moist, southeasterly flow. Mild and dry conditions are forecast to continue through Saturday from North Carolina to southern New England before rain returns Sunday.