A blizzard warning is in effect for New Hampshire's Seacoast from Sunday evening through Monday, bringing heavy snow and dangerous conditions. The National Weather Service predicts significant snowfall across the region, with Portsmouth expecting 11 inches, Concord 8 inches, and Manchester 10 inches.

Keene and Nashua face 12 and 13 inches respectively, while Sanford, Maine, and York, Maine, also see substantial accumulation. Wind gusts up to 50 mph will create near-whiteout conditions, making travel 'treacherous and potentially life-threatening' and likely causing power outages due to downed trees and branches. Businesses in affected areas should prepare for potential disruptions, supply chain delays, and increased costs from storm recovery efforts.