The remnants of Ida will team up with a stalled front to produce a significant threat of flooding rain and isolated tornadoes from parts of the Appalachians into the mid-Atlantic and Northeast through early Thursday.
Ida inflicted widespread wind and flood damage in southeast Louisiana on Sunday, including in the New Orleans metro area. See this link for the latest details on those impacts and the recovery ahead.
Ida's low-pressure system will now track from out of the South into the mid-Atlantic through early Thursday, where it will join up with a front draped across that region. This combination of ingredients could cause dangerous rainfall flooding from parts of the Appalachians into the mid-Atlantic and Northeast.
Radar, Watches and Warnings
The potential for heavy rainfall will expand northward across the East through Wednesday and then could linger into early Thursday along the Northeast coast. Ida's remnant should push off the East Coast by later Thursday, giving way to a drier weather pattern for the end of the workweek.
Flood watches have been posted by the National Weather Service for this flood threat, from the southern Appalachians to as far north as southeast New York and southern New England. Charleston, West Virginia, Harrisburg, Pennsylvania, Philadelphia and New York City are included in these watches.
In addition, NOAA's Weather Prediction Center (WPC) has issued a rare "high risk" excessive rainfall outlook for Wednesday and Wednesday night from far northern West Virginia into southern Pennsylvania, the New York City area and southern Connecticut. When a high risk is issued, the WPC expects severe, widespread flash flooding, potentially including areas that don't normally experience flash flooding.
Some of these areas were recently hit by heavy rain from Tropical Storm Fred and/or Hurricane Henri.
Flash flooding, particularly where bands of rain stall for a period of a few hours and over hilly or mountainous terrain, is expected in these areas through early Thursday.
Flooding of rivers, creeks and streams is likely in at least some locations. Multiple river gauges in parts of the mid-Atlantic and central Appalachians are forecast to see minor, moderate or even major river flooding, according to NOAA forecasts.
Do not drive through flooded roads and if you live in a location prone to flooding, then be sure to have a way to receive warning information.
WPC is forecasting the following storm total rainfall amounts.
-Portions of the Southeast, including the western Florida Panhandle, eastern and northern Alabama and northern Georgia: an additional 1 to 3 inches through Wednesday morning.
-Middle Tennessee Valley to the Ohio Valley and the central and southern Appalachians: 3 to 6 inches, with localized heavier totals.
-Mid-Atlantic to Southern New England: 3 to 8 inches with localized heavier totals Wednesday into Thursday.
Isolated tornadoes are frequently a concern with inland remnants of tropical systems
The potential for a few tornadoes, along with damaging wind gusts, will continue in the mid-Atlantic and eastern Carolinas Wednesday. The greatest threat for tornadoes Wednesday includes the Baltimore and Washington D.C. areas.
Tornado Potential Wednesday - Wednesday Night
Ida began as Tropical Depression Nine on Aug. 26 while south of the Cayman Islands. Just over six hours later, an Air Force Reserve Hurricane Hunter mission found its winds were strong enough to upgrade to Tropical Storm Ida.
A burst of thunderstorms near Ida's center then allowed it to rapidly intensify into a hurricane on Aug. 27 as it moved over western Cuba.
Ida then took advantage of very warm Gulf water, winds aloft spreading apart and plenty of moist air to rapidly intensify again from Cat. 1 to Cat. 4 status in 24 hours from Saturday to Sunday morning prior to its landfall.
Ida's center crossed the coast near Port Fourchon, Louisiana, at 11:55 a.m. CDT Sunday. Maximum sustained winds were 150 mph, making Ida a high-end Category 4 hurricane.
Ida tied two other hurricanes for the strongest landfall on record in the state of Louisiana based on maximum wind speeds. Laura had 150-mph winds when it tracked into southwest Louisiana last year. The other hurricane to make landfall in Louisiana with winds that high was in 1856.
(MORE: Hurricane Ida Gives Louisiana Cat. 4 Landfalls in Back-to-Back Season For First Time)
Ida also made landfall on the 16th anniversary of Hurricane Katrina's landfall in 2005.
Storm Surge
Storm surge pushed water into many areas outside levee protection in southeast Louisiana, as well as along the coast in Mississippi.
Several NOAA gauges captured peak inundation from 6 to 7 feet above dry ground in Waveland, Mississippi, and Shell Beach, Louisiana during and even after Ida's landfall as strong onshore winds continued to pile water ashore.
In Plaquemines Parish, overtopping of a levee submerged the town of Braithwaite, also flooded from Hurricane Isaac in 2012. In Jefferson Parish, flooding swamped areas south of New Orleans including Lafitte and Barataria.
Water almost up to a stop sign was seen flowing through the Venetian Isles neighborhood in New Orleans East, an area under mandatory evacuation outside of protection from levees, according to WDSU TV.
Several feet of storm surge from Lake Pontchartrain coupled with torrential rain was captured in video in LaPlace, about 25 miles west-northwest of downtown New Orleans, entering homes and trapping residents.
The combination of storm surge and torrential rain prompted the NWS to issue rare flash flood emergencies for the lakeshore area of metro New Orleans, and also for St. John the Baptist and St. Charles Parishes, including LaPlace Sunday night.
Post-storm surveys will likely find higher storm surge inundation values near the coast once meteorologists examine buildings for high-water marks.
Winds
The National Weather Service issued several extreme wind warnings for parts of southeast Louisiana Sunday, a rarely-issued warning for tornado-like winds of 115 mph or greater in the eyewall of Ida.
According to NOAA's Best Track database, no Category 3 or stronger hurricane had taken a northward path just west of New Orleans similar to Ida in almost 106 years.
(MORE: Why New Orleans took such a damaging strike from Ida)
Numerous wind gusts over 100 mph were clocked in far southeast Louisiana near the coast, including in Galliano and Dulac. A gust to 172 mph was measured aboard a ship in Port Fourchon as Ida made landfall, one of the strongest hurricane gusts on record in the U.S.
Damage was reported in many areas of southeast Louisiana, particularly in Lafourche and Terrebonne Parishes.
In the New Orleans metro area, wind gusts up to 99 mph not only downed trees and power lines, but also damaged or destroyed some older buildings. Damage was captured on video in the French Quarter, and in other parts of the city.
The winds knocked out power to all of Orleans Parish due to what Entergy referred to as "catastrophic transmission damage". Over 1 million customers lost power in Louisiana from Ida.
Downed trees littered a stretch of Interstate 10 outside of New Orleans Monday, leaving only one lane passable, according to a video posted in social media.
In Mississippi, winds gusted up to 68 mph at Gulfport-Biloxi International Airport. Trees were downed in parts of central and southern Mississippi, and just over 90,000 customers lost power.
Rainfall Flooding
As if water surging from the Gulf of Mexico wasn't enough, Ida dumped torrential rain in parts of Louisiana, Mississippi, Alabama and the western Florida Panhandle.
Up to almost 14 inches of rain was measured in New Orleans before rain ended early Monday. Rigolets-Slidell, Louisiana, reported 15.73 inches of rainfall from Ida.
In Jackson County, Mississippi, an estimated 300 homes were flooded and 150 road closures were prompted. Between more than 10 inches of rain fell near Bay St. Louis and in Hancock. Streets were also flooded in Hattiesburg and Meridian.
Parts of southern Alabama picked up 7 to 9 inches of rain and Wilmer, Alabama, measured 11.24 inches. Walnut Hill, Florida, tallied 8.20 inches of rain.
Tornadoes
Monday, a damaging tornado touched down just north of Mobile, Alabama, damaging a motel, downing trees and flipping an 18-wheeler in Saraland.
Another apparent tornado was observed in video in Pike County, southeast of Troy, Alabama.
Other damage possibly from tornadoes was documented in Jackson County, Mississippi, and Clarke County, Alabama, Monday.
Roof damage is seen in the aftermath of Hurricane Ida, Monday, Aug. 30, 2021, in Houma, La. The weather died down shortly before dawn. (AP Photo/David J. Phillip)
The Weather Companys primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives. This story does not necessarily represent the position of our parent company, IBM.
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