Ida becomes a tropical depression over Mississippi.
1. Ida will continue to produce heavy rainfall tonight through Tuesday morning across portions of southeast Louisiana, Mississippi, and western Alabama, resulting in considerable flash and urban flooding and significant river flooding impacts. Rivers in the Lower Mississippi Valley will remain elevated into next week. As Ida moves inland, additional considerable flooding impacts are likely across portions of the Tennessee Valley, the Ohio Valley, and particularly in the Central and Southern Appalachians into the Mid-Atlantic through Wednesday.
2. In areas that experienced damage and power loss, individuals should use extreme caution during the recovery phase. Post-storm fatalities and injuries often result from heart attacks, heat exhaustion, accidents related to clean up and recovery, and carbon monoxide poisoning from improper generator use.
CHANGES WITH THIS ADVISORY: All Tropical Storm and Storm Surge Warnings have been discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: There are no coastal watches and warnings in effect.
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: Water levels along the northern Gulf coast should continue to subside through this evening.
RAINFALL: Through Tuesday morning across portions of southeast Louisiana into far southern Mississippi, Ida will produce additional rainfall totals of 2 to 4 inches with localized higher amounts possible. 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 considerable flash flooding and riverine flooding continuing farther inland.
Ida will continue to turn northeast this evening and is forecast to track across the Middle Tennessee Valley, Ohio Valley and Mid Atlantic through Wednesday, producing the following rainfall totals:
Coastal Alabama to the far western Florida panhandle: An additional 3 to 6 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 Mid Atlantic: 3 to 6 inches with isolated higher amounts, Tuesday into Wednesday.
Southern New England: 2 to 4 inches with isolated higher amounts, Wednesday into Thursday.
Considerable flash flooding is possible from the Lower Mississippi Valley through the Middle Tennessee Valley, Ohio Valley, Central/Southern Appalachians, and into the Mid Atlantic. Widespread minor to isolated major riverine flooding is occurring or forecast from the Lower Mississippi Valley into far western Alabama. Rivers will remain elevated into next week.
TORNADOES: A few tornadoes are possible through tonight, mainly across far southeast Mississippi, the southern half of Alabama, and the western Florida Panhandle. The threat for a few tornadoes will shift east on Tuesday and become centered across eastern Alabama, western Georgia, and the Florida Panhandle.
SURF: Swells will continue to affect portions of the northern Gulf coast through this evening. These swells are likely to cause life threatening surf and rip current conditions. Please consult products from your local weather office.
At 400 PM CDT (2100 UTC), the center of Tropical Depression Ida was located near latitude 32.6 North, longitude 90.3 West. The depression is moving toward the north northeast near 9 mph (15 km/h). A faster northeastward motion is expected tonight through Wednesday. On the forecast track, the center of Ida will move farther inland over central and northeastern Mississippi tonight. Ida is then forecast to move across the Tennessee Valley on Tuesday and near the central Appalachians on Wednesday. Maximum sustained winds have decreased to near 35 mph (55 km/h) with higher gusts. Additional weakening is forecast during the next day or so. The minimum central pressure estimated from surface observations is 999 mb (29.50 inches).
Ida has continued to weaken while moving farther inland over west-central Mississippi this afternoon. Recent observations indicate that the stronger winds seen this morning along the northern Gulf coast have now dropped below tropical storm strength, and Ida has become a tropical depression. Additional weakening should occur while Ida moves over northeastern Mississippi and the Tennessee Valley during the next 12 to 24 hours. Ida is forecast to become an extratropical cyclone over the eastern United States by late Wednesday, and it is likely to be absorbed within a frontal boundary over the western Atlantic by the end of the forecast period.
Ida has turned northeastward and is now moving 020/8 kt. A mid- to upper-level trough approaching Ida from the west should cause the cyclone to move faster toward the northeast over the next couple of days. The latest runs of the dynamical models are in a bit better agreement regarding the forward speed of the Ida as it moves across the eastern U.S., and the NHC track forecast is again near the middle of the guidance envelope.
Although Ida's winds have decreased, the threat of heavy rainfall and flooding will continue to spread inland over portions of the Tennessee and Ohio Valleys, the Central and Southern Appalachians and the Mid-Atlantic through Wednesday.
This is the last advisory issued by the National Hurricane Center on Ida. Future information on this system can be found in Public Advisories issued by the Weather Prediction Center beginning at 10 PM CDT, under AWIPS header TCPAT4, WMO header WTNT34 KWNH, and on the web at http://www.wpc.ncep.noaa.gov.
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