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Tropical Depression Ida Discussion Number  19
NWS National Hurricane Center Miami FL       AL092021
400 PM CDT Mon Aug 30 2021
 
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. 
 
Key Messages:
 
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.
 
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  30/2100Z 32.6N  90.3W   30 KT  35 MPH...INLAND
 12H  31/0600Z 33.6N  89.3W   25 KT  30 MPH...INLAND
 24H  31/1800Z 34.8N  87.2W   25 KT  30 MPH...INLAND
 36H  01/0600Z 36.3N  84.3W   20 KT  25 MPH...INLAND
 48H  01/1800Z 38.0N  80.7W   20 KT  25 MPH...POST-TROP/INLAND
 60H  02/0600Z 39.0N  77.0W   25 KT  30 MPH...POST-TROP/EXTRATROP
 72H  02/1800Z 39.5N  74.2W   30 KT  35 MPH...POST-TROP/EXTRATROP
 96H  03/1800Z 41.0N  67.9W   30 KT  35 MPH...POST-TROP/EXTRATROP
120H  04/1800Z...DISSIPATED
 
$$
Forecaster Brown
 
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