Hopefully you’ve run all your errands, because it may be tough sledding for Marylanders seeking to leave their homes Monday morning.

For days forecasters have been eyeing a weather system to Maryland’s west with the potential to bring widespread, heavy snow to the region. Well, here it comes.

The National Weather Service has placed the state under a winter storm warning and will remain so until Tuesday at 1 a.m. Most of the Baltimore metro area is forecast to see upwards of 6 inches of snow, and regions to the south of Charm City could get up to a foot.

Schools across the region have preemptively decided to close ahead of what could be the worst winter storm in years. Courts are also announcing closures and other government offices will likely follow.

Gov. Wes Moore declared a state of preparedness in advance of the elevated winter storm threat from Sunday through Monday. His office is asking people to avoid unnecessary travel.

Snow totals will depend on the storm’s track, Cody Ledbetter, a meteorologist with the local NWS office, said.

“If it shifts north or south, it could be significantly different,” Ledbetter said, adding that snowfall of some kind is guaranteed across the region.

Snowfall will start after 10 p.m. in the Baltimore metro region. Precipitation should continue through Monday morning until tapering off after lunch. A second band of snow could bring more accumulation Monday evening before clearing out, according to the NWS forecast.

As of Sunday afternoon, forecasters predict anywhere from 6 to 11 inches of snow will fall across most of Baltimore City, Baltimore County, Harford County and Carroll County. Portions of Howard, southern Carroll, Montgomery and Anne Arundel counties are forecast to get 8 inches to a foot of snow.

If the storm shifts north, the heaviest snow could fall in Baltimore. Ledbetter said some spots could see more than a foot.

Mayor Brandon Scott declared a snow emergency ahead of the storm’s arrival, and city workers started winterizing roads on Saturday to prevent ice buildup. The city has more than 450 pieces of snow-plowing equipment.

Joey Henderson, director of the Baltimore Office of Emergency Management, warned residents on Friday to “take this storm seriously.”

Baltimore City, Baltimore County, Anne Arundel County, Harford County, Howard County and Montgomery County all canceled school Monday before the first flake fell.

Interim Baltimore County Executive D’Andrea Walker held a news conference Sunday afternoon to reassure residents about the county’s preparedness. A former director of the county’s public works and transportation department, Walker joked with reporters that, if any emergency were to happen during her brief tenure, this would be the one she’d pick.

Baltimore County has 90,000 tons of salt on hand and has been treating roads.

Annapolis officials ordered residents to move cars parked in snow emergency routes by 11 p.m. Sunday. Parking at some city garages will be made free, and residents can leave their vehicles in those garages until the storm ends.

Jurisdictions across the metro area will plow roads on a tiered or priority system. Major thoroughfares such as Eastern Avenue in Baltimore and Owings Mills Boulevard in Baltimore County will be cleared first. Secondary arteries will follow, and then residential and side streets will be last on the list.

When the snow stops falling Monday, it will likely linger. Freezing temperatures are forecast for the rest of the week.

Residents across the region will likely use more energy than normal to heat their homes as a result — which is tough considering Baltimore Gas and Electric Co.’s planned rate hikes.

Cold weather also coincides with more house fires, and local officials warned residents not to turn to alternative heating methods, such as using the oven to heat a room. Kerosene heaters are also illegal indoors in Baltimore City.

Banner reporters Cayla Harris and Rona Kobell contributed to this story.

This story will be updated.