New Hampshire braces for a potent nor’easter packing heavy snow, gale-force winds and possible coastal flooding. The storm barrels closest Monday, slamming southern areas hardest.

Officials at the National Weather Service issued the blizzard warning for coastal Rockingham County starting late Sunday and running until late Monday night. Winter storm warnings blanket much of interior southern New Hampshire. Blizzard conditions—defined as visibility under a quarter-mile from snow or blowing snow paired with gusts of at least 35 mph for three straight hours—threaten coastal towns.

Snow kicks off lightly around midnight in far southern New Hampshire, then pushes north overnight. By Monday morning rush hour, steady flakes will slick roads from Manchester to Portsmouth. Heavier bands target Jaffrey, Nashua and other southern spots, cutting visibility sharply amid gusts topping 40 mph. Conditions worsen Monday morning near the coast, where blowing snow could spark near-whiteouts.

Snow tapers in the evening. Plow crews face slow going as accumulation builds. The storm exits west to east late Monday, ushering dry weather by Tuesday. Central and northern areas see lighter action overall.

Forecast totals climb highest in the south. Expect 4 to 8 inches across much of southern New Hampshire. The lower Monadnock region, Merrimack Valley and Seacoast could hit 8 to 12 inches locally. A sharp drop-off looms farther north: 2 to 4 inches in the Lakes Region and Mount Washington Valley. North of the White Mountains, just a coating to 2 inches. Eastern Massachusetts toward Boston faces a foot or more.

Winds howl from the northeast as the system intensifies. Gusts to 45 mph strike Monday morning, scattering snow and fueling low visibility. Large waves crash ashore, raising minor flooding risks at high tide Monday, according to forecasters.

Travel turns treacherous, especially during commutes. Authorities urge drivers to check road conditions and avoid unnecessary trips. Power outages remain a concern where heavy snow snaps branches into lines.

Sunday stays mostly dry until afternoon flurries hint at trouble ahead. Residents should secure outdoor items and prepare emergency kits. Schools and businesses in affected areas may close or delay openings.