After Isaias rocks East Coast, more storms on the way

Along the East Coast, where millions are still without power because of Tropical Storm Isaias, more rain is expected in the coming days.

More than1.6 million customers across New Jersey, New York and Connecticut have been affected by power outages.

PHOTO: Already Thursday morning, a round of storms is moving through parts Maryland and Virginia. These storms are headed off to Delaware, Pennsylvania and New Jersey in the next few hours. (ABC News)

PHOTO: Already Thursday morning, a round of storms is moving through parts Maryland and Virginia. These storms are headed off to Delaware, Pennsylvania and New Jersey in the next few hours. (ABC News)

PHOTO: Already Thursday morning, a round of storms is moving through parts Maryland and Virginia. These storms are headed off to Delaware, Pennsylvania and New Jersey in the next few hours. (ABC News)

The National Oceanic and Atmospheric Administration (NOAA) said Thursday that it expects the months ahead to be some of the "most active" in decades.

The agency utilized its Accumulated Cyclone Energy (ACE) index, which measures the combined intensity and duration of all named storms during the season.

"This year, we expect more, stronger, and longer-lived storms than average, and our predicted ACE range extends well above NOAA’s threshold for an extremely active season," Gerry Bell, lead seasonal hurricane forecaster at NOAA’s Climate Prediction Center, said in a statement.

The agency said this is one of the most active seasonal forecasts that NOAA has produced in its 22-year history of hurricane outlooks.

NOAA's updated outlook covers the entire six-month hurricane season and calls for 19 to 25 named storms.

Hurricane season ends Nov. 30.

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PHOTO: The NOAA said this is one of the most active seasonal forecasts it has produced in its 22-year history of hurricane outlooks. (Daniel Manzo/ABC News)

PHOTO: The NOAA said this is one of the most active seasonal forecasts it has produced in its 22-year history of hurricane outlooks. (Daniel Manzo/ABC News)

PHOTO: The NOAA said this is one of the most active seasonal forecasts it has produced in its 22-year history of hurricane outlooks. (Daniel Manzo/ABC News)

On Thursday, storms were moving through parts Maryland and Virginia and headed to Delaware, Pennsylvania and New Jersey.

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A new flash flood watch has been issued for the region. In eastern Pennsylvania, rivers are just beginning to recede from elevated levels due to the excessive rainfall. Any additional rain could cause flash flooding.

PHOTO: High-resolution models are showing that some of the storms will likely make it into the New York City metro area by Friday, where localized flooding will be possible. (ABC News)

PHOTO: High-resolution models are showing that some of the storms will likely make it into the New York City metro area by Friday, where localized flooding will be possible. (ABC News)

PHOTO: High-resolution models are showing that some of the storms will likely make it into the New York City metro area by Friday, where localized flooding will be possible. (ABC News)

High-resolution models are showing that some of the storms will likely make it into the New York City metro area by Friday, where localized flooding will be possible.

Then it appears another wave of strong storms will arrive early Saturday morning in parts of New Jersey, eastern Pennsylvania and perhaps New York City.

PHOTO: Then it appears another wave of strong storms will arrive early Saturday morning in parts of New Jersey, eastern Pennsylvania and perhaps New York City. (ABC News)

PHOTO: Then it appears another wave of strong storms will arrive early Saturday morning in parts of New Jersey, eastern Pennsylvania and perhaps New York City. (ABC News)

PHOTO: Then it appears another wave of strong storms will arrive early Saturday morning in parts of New Jersey, eastern Pennsylvania and perhaps New York City. (ABC News)

These storms could bring 3 to 4 inches of rain to parts of the Mid-Atlantic, especially northern Virginia to southern New Jersey, which means the flooding threat could last for the next few days.

PHOTO: These storms could bring 3 to 4 inches of rain to parts of the Mid-Atlantic, especially northern Virginia to southern New Jersey, which means the flooding threat could last for the next few days. (ABC News)

PHOTO: These storms could bring 3 to 4 inches of rain to parts of the Mid-Atlantic, especially northern Virginia to southern New Jersey, which means the flooding threat could last for the next few days. (ABC News)

PHOTO: These storms could bring 3 to 4 inches of rain to parts of the Mid-Atlantic, especially northern Virginia to southern New Jersey, which means the flooding threat could last for the next few days. (ABC News)

Out west, a fire threat remains from Arizona to Montana due to dry and gusty winds. In Nevada, the dry air and lightning pose a risk for fires.

After Isaias rocks East Coast, more storms on the way originally appeared on abcnews.go.com

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