1. Extremely life-threatening storm surge inundation of 9 feet or greater above ground level is imminent somewhere within the area from Burns Point, Louisiana, to Ocean Springs, Mississippi. Overtopping of local levees outside of the Hurricane and Storm Damage Risk Reduction System is possible where local inundation values may be higher.

2. Catastrophic wind damage will occur where the core of Ida moves onshore along the southeast coast of Louisiana in the next few hours. Hurricane-force winds and damaging wind gusts are expected today within the Hurricane Warning in southeastern Louisiana, including metropolitan New Orleans.

3. Damaging winds, especially in gusts, will spread inland near the track of the center of Ida into southwestern Mississippi tonight and early Monday. These winds will likely lead to widespread tree damage and power outages.

4. Ida will continue to produce heavy rainfall today through Monday across the central Gulf Coast from southeast Louisiana, coastal Mississippi, and far southwestern Alabama, resulting in considerable to life-threatening flash and urban flooding and significant river flooding impacts. As Ida moves inland, significant flooding impacts are possible across portions of the Lower Mississippi, Tennessee Valley, Upper Ohio Valley, Central Appalachians and the Mid-Atlantic through Wednesday.

1. Extremely life-threatening storm surge inundation of 9 feet or greater above ground level will continue through early this evening along portions of the coast between Burns Point, Louisiana, to Ocean Springs, Mississippi. Overtopping of local levees outside of the Hurricane and Storm Damage Risk Reduction System is possible where local inundation values may be higher.

2. Catastrophic wind damage will occur near the core of Ida as it moves inland over southeastern Louisiana during the next few hours. Hurricane-force winds and damaging wind gusts are expected through tonight within the Hurricane Warning area in southeastern Louisiana, including metropolitan New Orleans.

3. Damaging winds, especially in gusts, will spread inland near the track of the center of Ida into southwestern Mississippi tonight and early Monday. These winds will likely lead to widespread tree damage and power outages.

4. Ida will continue to produce heavy rainfall through Monday across the central Gulf Coast across southeast Louisiana, coastal Mississippi, and southwestern Alabama, resulting in considerable to life-threatening flash and urban flooding and significant river flooding impacts. As Ida moves inland, significant flooding impacts are possible across portions of the Lower Mississippi Valley, Tennessee Valley, Upper Ohio Valley, Central Appalachians, and Mid-Atlantic through Wednesday.

CHANGES WITH THIS ADVISORY:

None

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...
- Intracoastal City Louisiana to the Alabama/Florida border
- Vermilion Bay, Lake Borgne, Lake Pontchartrain, Lake Maurepas, and Mobile Bay

A Hurricane Warning is in effect for...
- Intracoastal City Louisiana to the Mouth of the Pearl River
- Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans

A Tropical Storm Warning is in effect for...
- Cameron Louisiana to west of Intracoastal City Louisiana
- Mouth of the Pearl River to the Alabama/Florida border

A Storm Surge Warning means there is a danger of lifethreatening inundation from rising water moving inland from the coastline in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. This is a lifethreatening situation. Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions. Promptly follow evacuation and other instructions from local officials.

A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area.

A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area.

For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office.

Key messages for Ida can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at hurricanes.gov/graphics_at4.shtml?key_messages.

STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide...

Port Fourchon, LA to Mouth of the Mississippi River...1216 ft Morgan City, LA to Port Fourchon, LA...812 ft Mouth of the Mississippi River to Bay St. Louis, MS including Lake Borgne...812 ft Bay St. Louis, MS to Ocean Springs, MS...58 ft Burns Point, LA to Morgan City, LA...58 ft Lake Pontchartrain...58 ft Ocean Springs, MS to MS/AL border...47 ft Lake Maurepas...46 ft East of Intracoastal City, LA to Burns Point, LA including Vermilion Bay...35 ft MS/AL border to AL/FL border including Mobile Bay...35 ft Rockefeller Wildlife Refuge, LA to Intracoastal City, LA...13 ft AL/FL border to Okaloosa/Walton County Line including Pensacola Bay...13 ft

Overtopping of local levees outside of the Hurricane and Storm Damage Risk Reduction System is possible where local inundation values may be higher than those shown above.

The deepest water will occur along the immediate coast near and to the east of the landfall location, where the surge will be accompanied by large and dangerous waves. Surgerelated flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office.

WIND: Catastrophic wind damage is likely near the core of Ida as it moves inland over southeastern Louisiana through this afternoon. Hurricane conditions will spread farther inland within the Hurricane Warning area over southeastern Louisiana through tonight. Tropical storm conditions will also spread inland over portions of Louisiana and Mississippi tonight and Monday.

RAINFALL: Heavy rainfall from Ida will continue to impact the southeast Louisiana coast this morning, spreading northeast into the Lower Mississippi Valley later today into Monday. Total rainfall accumulations of 10 to 18 inches with isolated maximum amounts of 24 inches are possible across southeast Louisiana into far southern Mississippi through Monday. This is likely to result in lifethreatening flash and urban flooding and significant riverine flooding impacts.

Ida is forecast to turn to the northeast early Monday and track across the Middle Tennessee Valley and Upper Ohio Valley through Wednesday, producing the following rainfall totals:

Coastal Alabama to the far western Florida panhandle: 5 to 10 inches with isolated maximum amounts of 15 inches, today through Tuesday morning.

Central Mississippi: 4 to 8 inches with isolated maximum amounts of 12 inches, tonight through Monday night.

Middle Tennessee Valley, Upper Ohio Valley, Central Appalachians into the MidAtlantic: 3 to 6 inches with isolated higher amounts, Tuesday into Wednesday.

These rainfall totals will result in considerable flash and riverine flooding.

TORNADOES: Tornadoes will be most likely through Monday over southeast Louisiana, southern Mississippi, southwest Alabama, and the western Florida Panhandle. A few tornadoes are also possible farther north across much of Mississippi and Alabama on Monday.

SURF: Swells will affect the northern Gulf coast through early Monday. These swells are likely to cause lifethreatening surf and rip current conditions. Please consult products from your local weather office.

At 100 PM CDT (1800 UTC), the eye of Hurricane Ida was located by NWS Doppler radar near latitude 29.2 North, longitude 90.3 West. Ida is moving toward the northwest near 13 mph (20 km/h), and a slightly slower northwestward motion should continue through this evening. A turn toward the north should occur by Monday morning, followed by a slightly faster northeastward motion by Monday night and Tuesday. On the forecast track, the center of Ida will move farther inland over southeastern Louisiana this afternoon and tonight. Ida is then forecast to move well inland over portions of Louisiana and western Mississippi Monday and Monday night, and move across the Tennessee Valley on Tuesday.

Maximum sustained winds are near 150 mph (240 km/h) with higher gusts. Ida is an extremely dangerous category 4 hurricane on the SaffirSimpson Hurricane Wind Scale. Rapid weakening is expected during the next day or so, however Ida is forecast to remain a hurricane through late tonight.

Hurricaneforce winds extend outward up to 50 miles (85 km) from the center and tropicalstormforce winds extend outward up to 150 miles (240 km). A Florida Coastal Monitoring Observation Tower at South Lafourche Airport recently reported a sustained wind of 70 mph (113 km/h) and a wind gust of 102 mph (164 km/h). A sustained wind of 47 mph (60 km/h) and a gust of 63 mph (102 km/h) were recently reported at Lakefront Airport in New Orleans.

A NOAA National Ocean Service tide gauge in Shell Beach, Louisiana, recently reported a water level of 6.8 feet above mean higher high water, which is an approximation of inundation in that area.

The estimated minimum central pressure is 930 mb (27.46 inches).

Ida's rapid strengthening appears to have leveled off within the past hour or so. NOAA and Air Force Reserve Hurricane Hunter aircraft that have been in the storm this morning have reported peak flight-level winds of 146 to 148 kt between 8000 and 10000 ft, and believable SFMR winds around 130 kt. Based on these observations, the initial wind speed remains 130 kt for this advisory. The central pressure appears to have bottomed out around 929 mb, and the latest dropsonde in the eye from the Air Force plane supports a minimum pressure of 933 mb. Ida's satellite and radar presentation is very impressive, as the 15-nm-wide eye is very well-defined and surrounded by a ring of intense convection. Within the past hour or so, there is evidence in radar imagery of a secondary eyewall, and this has likely caused Ida's intensity to level off for now. Although Ida's extreme winds are confined to the inner eyewall, the aircraft data indicate that hurricane-force winds extend outward about 45 n mi to the northeast of the center, and based on buoy data the tropical-storm-force wind field extends outward about 130 n mi northeast of the center.

Ida's eyewall is nearing the coast of Louisiana, and any additional strengthening seems less likely now given the recent structural changes of the inner core. While rapid weakening should occur after landfall, damaging winds will penetrate well inland across southeastern Louisiana and southwestern Mississippi through tonight. Ida is forecast to weaken to a tropical depression over Mississippi by late Tuesday. The global model guidance now indicates that Ida will likely transition to an extratropical low when it nears the east coast of the United States and the new forecast shows the extratropical low becoming a gale center near Atlantic Canada at day 5.

Ida has begun to slow down according to the latest aircraft and radar fixes, and the initial motion estimate is 320/11 kt. Ida's forward speed is likely to slow further during the next 12 to 24 hours as the hurricane turns north-northwestward, and then northward around the western periphery of a deep-layer ridge near the southeastern United States coast. The cyclone is predicted to turn northeastward by late Tuesday ahead of a short-wave trough that will move across the central United States. The new NHC track is close to the HCCA corrected consensus and the GFS ensemble mean, and is not very different from the previous advisory.

NWS Doppler radar imagery and data from an Air Force Reserve Reserve Hurricane Hunter aircraft showed that Ida made landfall around 1655 UTC along the southeastern coast of Louisiana near Port Fourchon with estimated maximum winds of 130 kt and a minimum pressure around 930 mb. Since that time, Ida made a second landfall southwest of Galliano, Louisiana, and with the eyewall now onshore weakening has begun. Based on the latest Doppler velocities the initial wind speed has been conservatively reduced to 115 kt for this advisory. As Ida's circulation moves farther inland this evening and overnight a faster rate of weakening is expected, and Ida is forecast to become a tropical depression over Mississippi by late Monday. Although weakening is forecast, damaging winds, especially in gusts, are expected to spread inland over southeastern Louisiana and southwestern Mississippi through Monday morning. To account for this, the gust factor in the Forecast/Advisory has been adjusted accordingly. By 72 hours, Ida is predicted to merge with a frontal zone over the eastern United States and become an extratropical low, and this low is forecast to strengthen into a gale center near Atlantic Canada by the end of the forecast period.

Radar fixes indicate that Ida's forward motion has slowed and the initial motion estimate is 325/9 kt. The hurricane should turn northward tonight around the western periphery of a deep-layer ridge near the southeastern United States coast. Ida is forecast to turn northeastward and recurve over the eastern United States as it enters the mid-latitude westerlies. The GFS is a bit faster in ejecting the post-tropical cyclone northeastward on days 3 through 5, and the NHC forecast follows a blend of the various consensus models and the GFS ensemble mean.