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Hurricane Ida Advisory Number 16
NWS National Hurricane Center Miami FL AL092021
1000 PM CDT Sun Aug 29 2021
...IDA TURNING NORTHWARD OVER SOUTHEASTERN LOUISIANA...
...CATASTROPHIC STORM SURGE, EXTREME WINDS, AND FLASH FLOODING
CONTINUE IN PORTIONS OF SOUTHEASTERN LOUISIANA...
SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION
ABOUT 30 MI...50 KM ESE OF BATON ROUGE LOUISIANA
ABOUT 40 MI...65 KM WNW OF NEW ORLEANS LOUISIANA
MAXIMUM SUSTAINED WINDS...105 MPH...165 KM/H
PRESENT MOVEMENT...NNW OR 340 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...953 MB...28.15 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* Morgan City Louisiana to the Alabama/Florida border
* Lake Borgne, Lake Pontchartrain, Lake Maurepas, and Mobile Bay
A Hurricane Warning is in effect for...
* Morgan 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...
* Intracoastal City Louisiana to west of Morgan City Louisiana
* Mouth of the Pearl River to the Alabama/Florida border
A Storm Surge Warning means there is a danger of life-threatening
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 life-threatening 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.
DISCUSSION AND OUTLOOK
At 1000 PM CDT (0300 UTC), the center of Hurricane Ida was located
near latitude 30.3 North, longitude 90.7 West. Ida is moving toward
the north-northwest near 9 mph (15 km/h). A turn toward the north
is expected overnight, 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
tonight. Ida is then forecast to move well inland over portions of
western Mississippi Monday and Monday night, and move across the
Tennessee Valley on Tuesday.
Maximum sustained winds are near 105 mph (165 km/h) with higher
gusts. Rapid weakening is expected during the next day or so,
however, Ida is expected to remain a hurricane for several more
Hurricane-force winds extend outward up to 35 miles (55 km) from the
center and tropical-storm-force winds extend outward up to 140 miles
(220 km). A sustained wind of 64 mph ( 104 km/h) and a wind gust
of 90 mph (145 km/h) were reported recently reported at the New
Orleans International Airport.
The estimated minimum central pressure is 953 mb (28.15 inches).
HAZARDS AFFECTING LAND
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...
Morgan City, LA to Bay St. Louis, MS including Lake
Lake Pontchartrain...5-8 ft
Bay St. Louis, MS to Ocean Springs, MS...4-7 ft
Lake Maurepas...4-6 ft
Ocean Springs to AL/FL border including Mobile Bay...3-5 ft
Intracoastal City, LA to Morgan City, LA including Vermilion
AL/FL border to Okaloosa/Walton County Line including Pensacola
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. Surge-related 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: Wind damage is likely near the core of Ida as it moves
farther inland over southeastern Louisiana during the next few
Hurricane conditions will spread farther inland within the Hurricane
Warning area over southeastern Louisiana for the next few hours.
Tropical storm conditions will also spread inland over portions of
Louisiana and Mississippi through Monday.
RAINFALL: Heavy rainfall from Ida will continue to impact the
southeast Louisiana coast, spreading northeast into the Lower
Mississippi Valley this evening 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 life-
threatening flash and urban flooding and significant river
Ida is forecast to turn to the northeast on 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
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 Mid-Atlantic: 3 to 6 inches with isolated higher amounts,
Tuesday into Wednesday.
These rainfall totals will result in considerable flash flooding
along with widespread minor to isolated major riverine flooding from
the Lower Mississippi Valley into far western Alabama.
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 continue to affect the northern Gulf coast
through Monday. These swells are likely to cause life-threatening
surf and rip current conditions. Please consult products from your
local weather office.
Next intermediate advisory at 100 AM CDT.
Next complete advisory at 400 AM CDT.