The weather threats from the remnants of former Hurricane Ida now include severe thunderstorms for the southern half of New Jersey in addition to the statewide flash flooding expected as the storm system dumps 2 to 5 inches of rain on the state starting Wednesday afternoon.
Flash flood watches have been issued for the entire state by the National Weather Service. In the 16 states covered by the National Weather Service office in Mount Holly, the watch starts at 8 a.m. Wednesday. For the other five counties - Bergen, Essex, Hudson, Passaic and Union counties - the flash flood watch starts at 2 p.m. Both watches expire at 2 p.m. Thursday.
“The heaviest rainfall is expected late Wednesday afternoon through the overnight hours,” the National Weather Service’s Mount Holly office said in an update Tuesday morning. “Widespread rainfall of 2 to 5 inches is forecast, with locally higher amounts possible.”
The highest rainfall totals are expected north and west of the I-95 corridor. Some of those areas and rivers have been soaked in recent weeks.
“Numerous instances of flash flooding are likely Wednesday and Wednesday night, with some events possibly significant since the ground is saturated from recent heavy rains,” the weather service said.
Northern New Jersey could experience flooding of rivers, creeks, streams and poor drainage areas. The water is likely to cover roads, especially in low-lying areas, the weather service said.
The heavy rain is expected to last into Thursday and “the threat for flooding is high,” the weather service said.
The latest update on the storm now includes the threat of severe thunderstorms for much of the southern half of the state, though that region is likely to see lower rainfall totals. There’s a slight risk of isolated tornados.
In addition, strong wind gusts could bring down trees and power lines, leading to outages is some areas including South Jersey and southeast Pennsylvania.
Hurricane Ida blasted the Gulf of Mexico shoreline on Sunday as a Category 4 storm. It knocked out power to much of southeastern Louisiana and southern Mississippi, blowing roofs off buildings and reversing the flow of the Mississippi River.
Ida ravaged the region’s power grid, leaving the entire city of New Orleans and hundreds of thousands of other Louisiana residents in the dark with no clear timeline on when power would return. Some areas outside New Orleans also suffered major flooding and structure damage.
The storm was responsible for the deaths of at least two people who killed Monday night when a roadway collapsed in Mississippi. The death toll from Ida is expected to rise, officials said.
The Associated Press contributed to this report
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Anthony G. Attrino may be reached at tattrino@njadvancemedia.com. Follow him on Twitter @TonyAttrino. Find NJ.com on Facebook.
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N.J. weather: Ida remnants could spark severe thunderstorms, flash flooding. Update on timing, rainfall total - NJ.com
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