FLORIDA
STORMS
Tropical Storm Ida
LOCATED
65 MI SSW OF JACKSON MISSISSIPPI
WINDS
45 MPH
PRESSURE
993 MB
MOVING
N AT 8 MPH
From the National Hurricane Center at 700 AM CDT Mon Aug 30 2021
Ida moving northward over southwestern Mississippi.
TAP LINKS BELOW TO FOCUS
key messages
Alerts
hazards
summary
DISCUSSION

1. Dangerous storm surge inundation will continue through this morning along portions of the coast between Grand Isle, Louisiana, to Bay St. Louis, 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. Damaging winds, especially in gusts, will continue to spread inland near the track of Ida's center into southwestern Mississippi through this morning and early afternoon. These winds will likely lead to widespread tree damage and power outages.

3. Ida will continue to produce heavy rainfall tonight through Tuesday morning across portions of southeast Louisiana, coastal Mississippi, and southwestern Alabama resulting in considerable to life-threatening flash and urban flooding and significant riverine flooding impacts. As Ida moves inland, considerable flooding impacts are possible across portions of the Lower Mississippi Valley, Tennessee Valley, Ohio Valley, Central and Southern Appalachians, and Mid-Atlantic through Wednesday.

1. Dangerous storm surge inundation will continue through this morning along portions of the coast between Grand Isle, Louisiana, to Bay St. Louis, 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. Damaging winds, especially in gusts, will continue to spread inland near the track of Ida's center into southwestern Mississippi through this morning and early afternoon. These winds will likely lead to widespread tree damage and power outages.

3. Ida will continue to produce heavy rainfall tonight through Tuesday morning across portions of southeast Louisiana, coastal Mississippi, and southwestern Alabama resulting in considerable to life-threatening flash and urban flooding and significant riverine flooding impacts. As Ida moves inland, considerable flooding impacts are possible across portions of the Lower Mississippi Valley, Tennessee Valley, Ohio Valley, Central and Southern 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...
-Grand Isle, Louisiana, to the Alabama/Florida border

A Tropical Storm Warning is in effect for...
- Grand Isle, Louisiana, to the Alabama/Florida border, including Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans

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 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.

CHANGES WITH THIS ADVISORY:

None

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...
-Grand Isle, Louisiana, to the Alabama/Florida border

A Tropical Storm Warning is in effect for...
- Grand Isle, Louisiana, to the Alabama/Florida border, including Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans

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 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...

Pointe a la Hache, LA to Bay St. Louis, MS including Lake Borgne...46 ft Lake Maurepas and Lake Pontchartrain...46 ft Bay St. Louis, LA to AL/FL border including Mobile Bay...35 ft Grand Isle, LA to Pointe a la Hache, LA...24 ft Morgan City, LA to Grand Isle, 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: Tropical storm conditions will continue over portions of Louisiana, southern Mississippi, and southern Alabama through this morning or early afternoon.

RAINFALL: Through Tuesday morning, Ida will produce additional rainfall totals of 4 to 8 with localized higher amounts possible across portions of southeast Louisiana into far southern Mississippi. Storm total rainfall accumulations of 10 to 18 inches with isolated maximum amounts of 24 inches is expected. Heavy rain combined with storm surge has resulted in catastrophic impacts along the southeast coast of Louisiana with life threatening flash flooding and significant riverine flooding continuing farther inland.

Ida is expected to turn northeast this morning and is forecast to track across the Middle Tennessee Valley, Ohio Valley and MidAtlantic through Wednesday, producing the following rainfall totals:

Coastal Alabama to the far western Florida panhandle: An additional 4 to 8 inches resulting in storm total accumulations of 6 to 12 inches with isolated maximum amounts of 15 inches, today through Tuesday morning.

Central Mississippi into far western Alabama: 4 to 8 inches with isolated maximum amounts of 12 inches, today through tonight.

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

Considerable flash flooding is possible from the Lower Mississippi Valley through the Middle Tennessee Valley, Ohio Valley, Central/Southern Appalachians, and into the MidAtlantic. Widespread minor to isolated major riverine flooding is possible from the Lower Mississippi Valley into far western Alabama through Wednesday.

TORNADOES: A few tornadoes are possible today into tonight, mainly across southeast Mississippi, southwest Alabama, and the western Florida Panhandle.

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

Pointe a la Hache, LA to Bay St. Louis, MS including Lake Borgne...46 ft Lake Maurepas and Lake Pontchartrain...46 ft Bay St. Louis, LA to AL/FL border including Mobile Bay...35 ft Grand Isle, LA to Pointe a la Hache, LA...24 ft Morgan City, LA to Grand Isle, 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: Tropical storm conditions will continue over portions of Louisiana, southern Mississippi, and southern Alabama through this morning or early afternoon.

RAINFALL: Through Tuesday morning, Ida will produce additional rainfall totals of 4 to 8 with localized higher amounts possible across portions of southeast Louisiana into far southern Mississippi. Storm total rainfall accumulations of 10 to 18 inches with isolated maximum amounts of 24 inches is expected. Heavy rain combined with storm surge has resulted in catastrophic impacts along the southeast coast of Louisiana with life threatening flash flooding and significant riverine flooding continuing farther inland.

Ida is expected to turn northeast this morning and is forecast to track across the Middle Tennessee Valley, Ohio Valley and MidAtlantic through Wednesday, producing the following rainfall totals:

Coastal Alabama to the far western Florida panhandle: An additional 4 to 8 inches resulting in storm total accumulations of 6 to 12 inches with isolated maximum amounts of 15 inches, today through Tuesday morning.

Central Mississippi into far western Alabama: 4 to 8 inches with isolated maximum amounts of 12 inches, today through tonight.

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

Considerable flash flooding is possible from the Lower Mississippi Valley through the Middle Tennessee Valley, Ohio Valley, Central/Southern Appalachians, and into the MidAtlantic. Widespread minor to isolated major riverine flooding is possible from the Lower Mississippi Valley into far western Alabama through Wednesday.

TORNADOES: A few tornadoes are possible today into tonight, mainly across southeast Mississippi, southwest Alabama, and the western Florida Panhandle.

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

At 700 AM CDT (1200 UTC), the center of Tropical Storm Ida was located by NOAA Doppler weather radars, satellite data, and surface observations near latitude 31.5 North, longitude 90.8 West. Ida is moving toward the north near 8 mph (13 km/h), and this general motion is forecast to continue today. A faster northeastward motion is expected to begin by tonight and continue on Tuesday. On the forecast track, the center of Ida will move farther inland over southwestern Mississippi this morning. Ida is then forecast to move over central and northeastern Mississippi this afternoon and tonight, and move across the Tennessee Valley on Tuesday.

Maximum sustained winds have decreased to near 45 mph (75 km/h) with higher gusts. Additional rapid weakening is forecast during the next day or so, and Ida is expected to become a tropical depression this afternoon.

Tropicalstormforce winds extend outward up to 150 miles (240 km), mainly southeast of the center over water. A coastal marine observing site at Dauphin Island, Alabama, recently reported sustained winds of 38 mph (61 km/h) and a gust to 46 mph (74 km/h). A wind gust to 45 mph (72 km/h) was recently measured at Biloxi, Mississippi.

The estimated minimum central pressure is 993 mb (29.32 inches).

At 700 AM CDT (1200 UTC), the center of Tropical Storm Ida was located by NOAA Doppler weather radars, satellite data, and surface observations near latitude 31.5 North, longitude 90.8 West. Ida is moving toward the north near 8 mph (13 km/h), and this general motion is forecast to continue today. A faster northeastward motion is expected to begin by tonight and continue on Tuesday. On the forecast track, the center of Ida will move farther inland over southwestern Mississippi this morning. Ida is then forecast to move over central and northeastern Mississippi this afternoon and tonight, and move across the Tennessee Valley on Tuesday.

Maximum sustained winds have decreased to near 45 mph (75 km/h) with higher gusts. Additional rapid weakening is forecast during the next day or so, and Ida is expected to become a tropical depression this afternoon.

Tropicalstormforce winds extend outward up to 150 miles (240 km), mainly southeast of the center over water. A coastal marine observing site at Dauphin Island, Alabama, recently reported sustained winds of 38 mph (61 km/h) and a gust to 46 mph (74 km/h). A wind gust to 45 mph (72 km/h) was recently measured at Biloxi, Mississippi.

The estimated minimum central pressure is 993 mb (29.32 inches).

Ida is now located well inland over southwestern Mississippi and weakening rapidly. However, Doppler velocity data from the Slidell, Louisiana, WSR-88D radar before it went down was still indicating velocity values near 90 kt between 4,000-4,500 ft, while the latest velocity data from Jackson, Mississippi, have been in the 70-75 kt range between 7,500 and 8,000 ft well east of the center. Thus, Ida will still be capable of producing damaging wind gusts in some of the stronger showers and thunderstorms for the next few hours. The intensity at 0600 UTC was 65 kt, which was based on a decay rate of about 10 kt per hour. A slightly slower decay rate of about 5 kt per hour has been used since then, which is the basis for the 50-kt advisory intensity at 0900 UTC. The estimated pressure of 990 mb is based on surface observation data, especially from McComb, Mississippi (KMCB), which has been reporting pressures near 995 mb with 25-30 kt of wind the past couple of hours.

The initial motion estimate is now 355/07 kt. Ida should continue moving northward today around the western periphery of a deep-layer ridge situated over the southeastern United States. A faster motion toward the northeast is expected by Tuesday as a mid- to upper-level trough approaches the cyclone, with that motion continuing through the remainder of the week. The new NHC track forecast is just a tad to the south of the previous advisory, and lies down the middle off the tightly packed consensus models.

Rapid weakening will continue as Ida moves farther inland over Mississippi due to land interaction and southwesterly vertical wind shear of more than 20 kt. However, damaging winds, especially in gusts, are expected to continue over southeastern Louisiana and southwestern Mississippi through through this morning. To account for this, the gust factor in the Forecast/Advisory has been adjusted accordingly. Ida is likely to weaken to a tropical depression this evening. Some slight restrengthening as an extratropical storm is possible when Ida moves over the western Atlantic in the day 4-5 period. In addition, heavy rains will spread northward and then northeastward along the forecast track.

Ida is now located well inland over southwestern Mississippi and weakening rapidly. However, Doppler velocity data from the Slidell, Louisiana, WSR-88D radar before it went down was still indicating velocity values near 90 kt between 4,000-4,500 ft, while the latest velocity data from Jackson, Mississippi, have been in the 70-75 kt range between 7,500 and 8,000 ft well east of the center. Thus, Ida will still be capable of producing damaging wind gusts in some of the stronger showers and thunderstorms for the next few hours. The intensity at 0600 UTC was 65 kt, which was based on a decay rate of about 10 kt per hour. A slightly slower decay rate of about 5 kt per hour has been used since then, which is the basis for the 50-kt advisory intensity at 0900 UTC. The estimated pressure of 990 mb is based on surface observation data, especially from McComb, Mississippi (KMCB), which has been reporting pressures near 995 mb with 25-30 kt of wind the past couple of hours.

The initial motion estimate is now 355/07 kt. Ida should continue moving northward today around the western periphery of a deep-layer ridge situated over the southeastern United States. A faster motion toward the northeast is expected by Tuesday as a mid- to upper-level trough approaches the cyclone, with that motion continuing through the remainder of the week. The new NHC track forecast is just a tad to the south of the previous advisory, and lies down the middle off the tightly packed consensus models.

Rapid weakening will continue as Ida moves farther inland over Mississippi due to land interaction and southwesterly vertical wind shear of more than 20 kt. However, damaging winds, especially in gusts, are expected to continue over southeastern Louisiana and southwestern Mississippi through through this morning. To account for this, the gust factor in the Forecast/Advisory has been adjusted accordingly. Ida is likely to weaken to a tropical depression this evening. Some slight restrengthening as an extratropical storm is possible when Ida moves over the western Atlantic in the day 4-5 period. In addition, heavy rains will spread northward and then northeastward along the forecast track.

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