Severe weather to hit central, eastern US, could bring tornadoes

A massive storm system sweeping across the United States is expected to unleash a dangerous combination of blizzard conditions, destructive winds and severe thunderstorms from the Midwest to the East Coast, threatening tens of millions of people as it intensifies into what forecasters describe as a “triple-threat” March megastorm.

Meteorologists say the sprawling system could affect areas home to nearly 200 million Americans as it moves from the central United States toward the East through Sunday and Monday. The storm is forecast to produce a mix of heavy snow and blizzard conditions in the Upper Midwest, while severe thunderstorms and damaging winds spread across the central and eastern parts of the country.

Forecasters warn the storm may rapidly strengthen as it tracks across the country, potentially evolving into a "bomb cyclone," which is a system that intensifies dramatically when atmospheric pressure drops quickly over a 24-hour period. Such rapid strengthening can generate a wide and powerful wind field capable of causing major disruptions.

Along the storm’s advancing cold front, meteorologists expect a large line of thunderstorms to develop from the central Plains toward the Midwest and parts of the eastern United States. Some of the storms could produce destructive wind gusts, tornadoes and torrential downpours, especially from Sunday afternoon into Monday.

More than a dozen states are expected to face the risk of severe weather as the storm system moves east. In addition to tornado potential, damaging straight-line winds and heavy rainfall could cause localized flooding and power outages in affected areas.

Farther north, colder air wrapping around the storm will bring heavy snow and blizzard conditions to parts of the Upper Midwest and Great Lakes region. Strong winds may lead to whiteout conditions and dangerous travel, particularly in areas where heavy snow coincides with gusty conditions.

Even outside the heaviest snow zone, powerful wind gusts could create widespread hazards across large portions of the central and eastern United States, increasing the risk of downed trees, power outages and travel disruptions.