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(CNN) -
The governors of New Jersey and New York declared a state of emergency in anticipation of a
nor'easter
this week.
In New York, Governor Kathy Hochul declared an emergency for more than 20 counties.
"I am declaring a state of emergency to ensure that we can provide the necessary resources to respond to this storm and protect lives and property in regions where significant rainfall is forecast," Hochul said in a press release.
"I am encouraging New Yorkers to prepare now for the inclement weather expected in the coming days and urging travelers to take precautions against the heavy rains expected tomorrow morning," he added.
Hochul ordered several state agencies early Monday to prepare the media for its deployment in the affected regions.
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New Jersey's state of emergency began at 8 p.m. Monday, Gov. Phil Murphy said.
"Severe weather conditions will affect the state starting tonight and for the next several days," he said.
The National Weather Service has issued several flash flood alerts in the Northeast starting Monday night and running through Tuesday afternoon affecting nearly 30 million people.
A "triple threat" of weather events will unfold this week across the United States
Thunderstorm lines are likely to develop producing total rainfall of 50 to 127 millimeters of rain, with larger amounts possible.
Precipitation rates will exceed 25 millimeters per hour at times.
These precipitations will cause flash floods of streams, streams, urban areas and poorly drained areas where the rainfall is most intense.
What is a
nor'easter
?
A
nor'easter
is an east coast storm with winds that usually come from the northeast, according to the National Weather Service.
These storms can occur at any time of the year, but are most common between September and April.
In winter, the temperatures associated with a
nor'easter
can be much more extreme than in autumn, which can lead to more intense storms and snow.
Storms can cause beach erosion and poor sea conditions, with winds of 58 kilometers per hour or more.
The Metropolitan Transportation Authority, which oversees the New York City subway and other transportation lines, expects 150 millimeters of rain in 12 hours, but it will be nothing like Hurricane Ida.
"At no point do we expect to see the kind of heavy rain in a very short time that we had during Hurricane Ida," said MTA President and Acting CEO Janno Lieber, noting that the city saw more than 89 millimeters in a hour during Ida.
"But we are prepared for whatever comes next," Janno added.
The biggest problem and limitation facing the MTA is the city's sewer system, which can be overflowed as it did during Ida, Janno said.
However, they do not expect it to be a problem during the storm.
CNN's Gene Norman, Rob Frehse, and Kiely Westhoff contributed to this report.
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