Visitors coming to New Jersey from any state that has a high COVID-19 infection rate will be required to have a 14-day self-quarantine period, effective at midnight tonight. 

Governor Phil Murphy was joined by New York's Governor Andrew Cuomo and Connecticut's Governor Ned Lamont for the virtual press conference for the announcement.

"People coming from states that have a high infection rate must quarantine for 14 days," Gov. Andrew Cuomo. This goes into effect at midnight.

The decision for which states are affected will be based on an infection rate formula, which Governor Cuomo says is a "10 per 100,000 thousand citizens" on a 7-day rolling average.

Any state that has an infection rate above that would require a 14-day quarantine. The list of states will be updated on a rolling basis as there continue to concerning trends from other states across the nation, which are reporting record COVID-19 case numbers.

The states that are currently on this list are:

Alabama, Arkansas, Arizona, Florida, North Carolina, South Carolina, Washington Utah, and Texas.

All visitors from those states will be required to self-quarantine for 14 days when they visit New Jersey (as well as New York and Connecticut).

The positivity rates in New Jersey, New York, and Connecticut continue to decrease, and Governor Cuomo said he believes that they have safely broken the back of the virus.

But all three emphasized the importance of staying the course to keep both states safe.

"It's the right thing to do, it's the responsible thing to do, it's the common sense thing today," Murphy says about the travel advisory. "It's a really smart step as these three states have broken the back of this virus."

The exact details regarding the enforcement were not made immediately clear. Governor Murphy said that additional details will be coming from the state's health department later today.

This is a developing story. We'll have more details when they're made available.