Cecilia Lei

He says southwest cities like Phoenix are experiencing oppressively warm weather because of what's known as a heat dome.

Meanwhile, temperatures plummeted in the northern part of the country, in some cases into the single digits and lower.

Blizzard conditions hit parts of Minnesota and Wisconsin over the weekend.

And the final threat, storms will hit a large swath of the East Coast today, affecting nearly 100 million people.

Even Hawaii is experiencing extremes, breaking daily rainfall records and facing flash flood warnings.

Borenstein says underlying much of this whiplash weather is a jet stream, a river of air that normally looks like a small roller coaster with mild dips.

But now those dips are steep.

One meteorologist told Borenstein that when they look more and more like vertical drops, the result is extreme conditions happening next to each other, like blizzards, tornadoes and heat waves.

Bornstein reminded us of this old weather proverb that says, March comes in like a lion and goes out like a lamb.

Not this year, it seems, and we may be seeing more marches like this in the years to come.

Last week, the Senate passed a massively successful piece of legislation.

It was the biggest federal move on housing in decades.

And it was bipartisan.

Sahil Kapoor is a senior national politics reporter for NBC News.

He told us about the Senate's bill called the 21st Century Road to Housing Act, which was led by Republican Senator Tim Scott and Democratic Senator Elizabeth Warren.

The bill also seeks to speed up home building by relaxing regulatory barriers.

Scott, the Republican champion of the legislation, spoke with CNBC last week about the rare consensus that he and his colleagues had reached.

And yet, as the House returns this week, the bill faces an uncertain future as both Democrats and Republicans want to make changes to it and as Trump has signaled other priorities.

As we talked about last week, the president has been far more focused on the Save America Act, a sweeping voter ID bill that would require proof of U.S.

citizenship.