ZCZC NFDTCPAT4 ALL
TTAA00 KWNH DDHHMM CCA
 
BULLETIN
Tropical Depression Ida Advisory Number  22...Corrected
NWS Weather Prediction Center College Park MD   AL092021
1000 AM CDT Tue Aug 31 2021

Corrected for current system status (TD)
 
...TROPICAL DEPRESSION IDA IS MOVING ACROSS THE TENNESSEE VALLEY...
...CONSIDERABLE HEAVY RAIN AND FLOOD THREAT WILL CONTINUE TO SPREAD
FROM THE TENNESSEE AND OHIO VALLEYS INTO THE CENTRAL AND SOUTHERN
APPALACHIANS AND MID ATLANTIC THROUGH WEDNESDAY...
 
 
SUMMARY OF 1000 AM CDT...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...35.0N 87.8W
ABOUT 60 MI...95 KM WNW OF HUNTSVILLE ALABAMA
ABOUT 100 MI...160 KM SW OF NASHVILLE TENNESSEE
MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
PRESENT MOVEMENT...NE OR 50 DEGREES AT 15 MPH...24 KM/H
MINIMUM CENTRAL PRESSURE...996 MB...29.42 INCHES
 
 
WATCHES AND WARNINGS
--------------------
Flood and Flash Flood Watches extend from the Gulf Coast Region
across the Tennessee and Ohio Valleys, central and southern
Appalachians, into the Mid-Atlantic and southern New England.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 1000 AM CDT (1500 UTC), the center of Tropical Depression Ida was
located near latitude 35.0 North, longitude 87.8 West. The
depression is moving toward the northeast near 15 mph (24 km/h) and
this motion is expected to gradually accelerate over the next couple 
of days.
 
Maximum sustained winds are near 30 mph (45 km/h) with higher gusts.
Little change in strength is forecast during the next 48 hours. 
 
The estimated minimum central pressure is 996 mb (29.42 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
RAINFALL: Tropical Depression Ida will produce the following
rainfall totals:
 
Portions of the Southeast, including the western Florida panhandle,
eastern and northern Alabama, and northern Georgia: An additional 1
to 3 inches through Wednesday morning.
 
Middle Tennessee Valley, Ohio Valley, Central and Southern
Appalachians into the Mid-Atlantic: 3 to 6 inches with isolated
higher amounts through Thursday morning.
 
Southern New England: 2 to 4 inches with isolated higher amounts,
Wednesday into Thursday.
 
Considerable flash flooding is possible from the Middle Tennessee
Valley, Ohio Valley, Central and Southern Appalachians, into the
Mid-Atlantic and southern New England, with additional widespread
moderate and isolated major river flooding impacts forecast from
northern West Virginia and western Maryland into southern
Pennsylvania and New Jersey.
 
Widespread minor to isolated major river flooding is occurring
or forecast from the Lower Mississippi Valley into far western
Alabama. Rivers will remain elevated into next week.
 
For the latest rainfall reports and wind gusts associated with
Tropical Depression Ida, see the companion storm summary at
WBCSCCNS4 with the WMO header of ACUS44 KWBC or at the following
link:
 
www.wpc.ncep.noaa.gov/discussions/nfdscc4.html
 
TORNADOES: The threat for a couple of tornadoes will be centered
this evening across eastern Alabama, western Georgia, and the
Florida Panhandle. On Wednesday, the threat of a few tornadoes will
shift into portions of the Mid Atlantic.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 400 PM CDT.
 
$$
Forecaster Churchill
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  31/1500Z 35.0N  87.8W   25 KT  30 MPH...INLAND
 12H  01/0000Z 36.0N  85.8W   25 KT  30 MPH...INLAND
 24H  01/1200Z 37.4N  82.7W   20 KT  25 MPH...INLAND
 36H  02/0000Z 38.6N  79.0W   20 KT  25 MPH...INLAND
 48H  02/1200Z 39.7N  75.6W   25 KT  30 MPH...POST-TROP/INLAND
 60H  03/0000Z 40.5N  72.0W   30 KT  35 MPH...POST-TROP/EXTRATROP
 72H  03/1200Z 41.3N  68.7W   35 KT  40 MPH...POST-TROP/EXTRATROP
 96H  04/1200Z...POST-TROP/EXTRATROP
 
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