BULLETIN
Post-Tropical Cyclone Ida Advisory Number  26
NWS Weather Prediction Center College Park MD   AL092021
1100 AM EDT Wed Sep 01 2021

...IDA NOW EXTRATROPICAL WITH WIDESPREAD HEAVY RAIN AND AREAS OF
LIFE THREATENING FLASH FLOODING TODAY AND TONIGHT NEAR THE TRACK...
...AN ENHANCED RISK FOR SEVERAL TORNADOES ACROSS PARTS OF THE
MID-ATLANTIC THIS AFTERNOON AND EVENING...


SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...38.3N 80.2W
ABOUT 45 MI...70 KM SSW OF ELKINS WEST VIRGINIA
ABOUT 70 MI...110 KM N OF ROANOKE VIRGINIA
MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
PRESENT MOVEMENT...ENE OR 60 DEGREES AT 25 MPH...41 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.


DISCUSSION AND OUTLOOK
----------------------
At 1100 AM EDT (1500 UTC), the center of Post-Tropical Cyclone Ida
was located near latitude 38.3 North, longitude 80.2 West. The
post-tropical cyclone is moving toward the east-northeast near 25
mph (41 km/h) and this motion is expected to continue.

Maximum sustained winds are near 30 mph (45 km/h) with higher gusts.
Some strengthening is forecast later today and tonight as Ida moves
offshore.

The estimated minimum central pressure is 1000 mb (29.53 inches).


HAZARDS AFFECTING LAND
----------------------
RAINFALL: Post-Tropical Cyclone 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, lower Hudson and Coastal Connecticut 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
Post-Tropical Cyclone Ida, see the companion storm summary at
WBCSCCNS4 with the WMO header of ACUS44 KWBC or at the following
link:

available at 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 500 PM EDT.


Forecaster Churchill

FORECAST POSITIONS AND MAX WINDS

INIT  01/1500Z 38.3N  80.2W   25 KT  30 MPH...POST-TROP/EXTRATROP
 12H  02/0000Z 40.0N  76.0W   30 KT  35 MPH...POST-TROP/EXTRATROP
 24H  02/1200Z 42.5N  70.3W   35 KT  40 MPH...POST-TROP/EXTRATROP
 36H  03/0000Z 44.9N  65.8W   35 KT  40 MPH...POST-TROP/EXTRATROP