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BULLETIN
Tropical Depression Ida Advisory Number  20
NWS Weather Prediction Center College Park MD   AL092021
1000 PM CDT Mon Aug 30 2021
 
...TROPICAL DEPRESSION IDA WAS OVER CENTRAL MISSISSIPPI..
...HEAVY RAIN AND FLOOD THREAT WILL CONTINUE TO SPREAD ACROSS
PARTS OF THE TENNESSEE AND OHIO VALLEY OVERNIGHT INTO
TUESDAY...
 
 
SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...33.3N 89.5W
ABOUT 80 MI...130 KM NNE OF JACKSON MISSISSIPPI
MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H
PRESENT MOVEMENT...NE OR 50 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 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 northern Mid-Atlantic and southern New
England.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 1000 PM CDT (0300 UTC), the center of Tropical Depression Ida was
located near latitude 33.3 North, longitude 89.5 West. The
depression is moving toward the northeast near 10 mph (17 km/h) and
this motion is expected to continue overnight.
 
Maximum sustained winds are near 35 mph (55 km/h) with higher gusts.
Little change in strength is forecast during the next 48 hours. 
 
The estimated minimum central pressure is 998 mb (29.47 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
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 tonight 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.
 
Northern Mississippi, 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.

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:  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.

 
NEXT ADVISORY
-------------
Next complete advisory at 400 AM CDT.
 
$$
Forecaster Bann
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  31/0300Z 33.3N  89.5W   30 KT  35 MPH...INLAND
 12H  31/1200Z 34.2N  88.4W   25 KT  30 MPH...INLAND
 24H  01/0000Z 35.7N  85.7W   25 KT  30 MPH...INLAND
 36H  01/1200Z 37.0N  82.8W   25 KT  30 MPH...INLAND
 48H  02/0000Z 38.0N  79.7W   25 KT  30 MPH...POST-TROP/INLAND
 60H  02/1200Z 39.0N  75.9W   30 KT  35 MPH...POST-TROP/EXTRATROP
 72H  03/0000Z 39.6N  72.2W   30 KT  35 MPH...POST-TROP/EXTRATROP
 
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