The US government shutdown is now the longest in the country's history and has shown no signs of abating.

JPMorgan CEO Jamie Dimon has suggested that US economic growth could go to zero, and one analyst said it could even go negative.

The US-China trade war and a looming conflict about the debt ceiling are creating a perfect storm.

We're 32 days into the record-breaking US government shutdown, and while most economists agree it will weigh on US economic growth, the chorus of warnings about doomsday scenarios is getting louder.

Government shutdowns have typically lasted a few days or a couple of weeks, but the fight between President Donald Trump and Democrats appears set to continue for much longer. According to economists, the negative effects of the shutdown will only grow as the ripple effects from the 800,000 federal employees and millions of government contractors going without pay spread through the economy.

Adding to the gloom is the negative effect of the US-China trade war, falling stock prices, growing worries about a slowdown in international growth, and a looming conflict about the debt ceiling.

Given all of the worries facing the US economy, warnings about the shutdown are only amplifying:

"The longer this shutdown drags on, the more collateral damage the economy will suffer," analysts at S&P said last week.

There are a variety of reasons for the shutdown slowdown. For instance, figures from 2013 suggest that federal workers spent 10% to 15% less while they went unpaid, reducing consumer spending.

The shutdown also exacerbates worried about potentially more economically damaging fights in Congress, the most pressing of which is the need to raise the debt ceiling in the coming months.

As it stands, the debt ceiling, or the statutory limit on the amount of debt the federal government can hold, kicks back in on March 1. While the US Treasury can maintain funding through special measures, the ceiling will still need to be lifted by Congress sometime over the summer.

Some analysts have said the historic dysfunction over the shutdown sets a nasty precedent for a debt-ceiling fight. Without an increase in the ceiling, the US could default on some of its debt, an unprecedented move that would send shockwaves through the global economy.

"Normally, the debt ceiling ends up being lifted, but with deadlock in Congress" there's added risk, said Neil MacKinnon, a global macro strategist at VTB Capital.