Massive winter storm will impact 40 million people in the United States this Tuesday

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(CNN) --

A mammoth winter storm stretching from the northern to the southern border of the United States continues its journey from coast to coast.

This Tuesday, 40 million people in the center of the country are under the threat of severe climatic impacts.

About 15 million people in a dozen states are under winter alerts Tuesday.

These alerts include blizzard, ice storm, and winter storm warnings, and winter weather advisories.

More than 25 million people from Texas to Mississippi are under threat from severe storms Tuesday.

Threats include tornadoes, some strong and damaging winds, and large hail.

The coast-to-coast storm, which battered the west over the weekend, is expected to strengthen as it moves east on Tuesday and stall in the central plains through Thursday, hampering travel amid snow and freezing rain.

Meanwhile, the southern end of the storm is expected to bring late-season tornadoes along with strong thunderstorms.

Here's what the different regions can expect in the coming days:

Portions of the Great Plains could experience severe thunderstorms, heavy downpours, and flash flooding.

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With snow expected to fall at a rate of 1 to 2 inches per hour amid strong 40 mph winds, blizzard conditions are expected for parts of the central and northern Plains on Tuesday and Wednesday. .

The Storm Prediction Center is forecasting a risk of tornadoes, large hail, and damaging winds in a straight line from eastern Texas to northern Louisiana and southwestern Mississippi.

A tornado watch was issued for parts of Texas and Oklahoma until 4 a.m.

A couple of tornadoes are possible, as well as hail the size of a ping-pong table and wind gusts of up to 120 kilometers per hour.

The greatest threat from flash flooding will be from the lower Mississippi Valley to the Central Gulf Coast, the Tennessee Valley, and the southern Appalachian Mountains Tuesday through Wednesday.

Freezing rain and sleet are possible in the upper Midwest through Wednesday.

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