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BULLETIN
Tropical Depression Ida Advisory Number  25
NWS Weather Prediction Center College Park MD   AL092021
500 AM EDT Wed Sep 01 2021
 
...TROPICAL DEPRESSION IDA IS MOVING INTO THE CENTRAL
APPALACHIANS AND SHOULD BECOME POST-TROPICAL TODAY...
...WIDESPREAD HEAVY RAIN AND AREAS OF LIFE THREATENING FLASH
FLOODING ARE LIKELY TODAY AND TONIGHT NEAR THE TRACK OF IDA...
...ENHANCED RISK FOR SEVERAL TORNADOES ACROSS PARTS OF THE
MID-ATLANTIC ON WEDNESDAY...
 
 
SUMMARY OF 500 AM EDT...0900 UTC...INFORMATION
----------------------------------------------
LOCATION...37.3N 82.5W
ABOUT 135 MI...220 KM W OF ROANOKE VIRGINIA
ABOUT 135 MI...215 KM NE OF KNOXVILLE TENNESSEE
MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
PRESENT MOVEMENT...NE OR 55 DEGREES AT 24 MPH...39 KM/H
MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES
 
 
WATCHES AND WARNINGS
--------------------
Flood and Flash Flood Watches are in effect for portions of the
central Appalachians, Mid-Atlantic, and into southern New York and
southern New England.
 
A Tornado Watch is in effect until 8 AM EDT Wednesday across
the District of Columbia, central and northern Maryland, and
northeastern Virginia. For the latest severe weather outlooks and
status of watches, including Tornado Watches, please refer to the
Storm Prediction Center.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 500 AM EDT (0900 UTC), the center of Tropical Depression Ida was
located near latitude 37.3 North, longitude 82.5 West. The
depression is moving toward the northeast near 24 mph (39 km/h) and
this motion is expected to continue over the next couple days.
 
Maximum sustained winds are near 30 mph (45 km/h) with higher gusts.
Some strengthening is forecast later today and tonight as Ida 
becomes extratropical.
 
The estimated minimum central pressure is 1000 mb (29.53 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
RAINFALL: Tropical Depression Ida will produce the following
rainfall totals:
 
Mid Atlantic to Southern New England: 3 to 8 inches with isolated
higher amounts through Thursday.
 
Significant and life-threatening flash flooding is likely from the
Mid-Atlantic into southern New England, especially across highly
urbanized metropolitan areas and areas of steep terrain. Widespread
moderate and major river flooding impacts are forecast from northern
West Virginia and western Maryland into southern Pennsylvania and
New Jersey, particularly in the Monongahela, Potomac, Susquehanna,
Delaware, and lower Hudson river basins.
 
Widespread minor to isolated major river flooding is occurring or
forecast from the Lower Mississippi Valley into far western Alabama
and northeast Georgia. 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: Several tornadoes are probable across portions of the
Mid Atlantic today, mainly during the afternoon and evening hours.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 1100 AM EDT.
 
$$
Forecaster Lamers
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  01/0900Z 37.3N  82.5W   25 KT  30 MPH...INLAND
 12H  01/1800Z 38.9N  79.1W   30 KT  35 MPH...POST-TROP/INLAND
 24H  02/0600Z 41.2N  73.7W   35 KT  40 MPH...POST-TROP/INLAND
 36H  02/1800Z 43.8N  68.5W   35 KT  40 MPH...POST-TROP/EXTRATROP
 48H  03/0600Z 46.1N  65.1W   35 KT  40 MPH...POST-TROP/EXTRATROP
 
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