BULLETIN
Post-Tropical Cyclone Ida Advisory Number  28
NWS Weather Prediction Center College Park MD   AL092021
1100 PM EDT Wed Sep 01 2021

...POST-TROPICAL CYCLONE IDA CONTINUES TO BRING WIDESPREAD HEAVY
RAINFALL AND AREAS OF LIFE THREATENING FLASH FLOODING ALONG AND
NEAR TRACK...
...AN ENHANCED RISK FOR TORNADOES WILL PERSIST ACROSS NORTHEAST NEW
JERSEY, SOUTHERN NEW YORK, AND FAR SOUTHERN NEW ENGLAND THROUGH THE
PRE-DAWN HOURS THURSDAY...


SUMMARY OF 1100 PM EDT...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...40.5N 74.3W
ABOUT 190 MI...300 KM ENE OF HAGERSTOWN MARYLAND
ABOUT 140 MI...225 KM E OF HARRISBURG PENNSYLVANIA
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...NE OR 55 DEGREES AT 28 MPH...44 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES


WATCHES AND WARNINGS
--------------------
Flood and Flash Flood Watches remain in effect for northern
portions of the Mid-Atlantic Region into southern New York and
southern New England.

Tornado Watches are in effect for portions of southern Connecticut,
northern New Jersey, and southern New York.


DISCUSSION AND OUTLOOK
----------------------
At 1100 PM EDT (0300 UTC), the center of Post-Tropical Cyclone Ida
was located near latitude 40.5 North, longitude 74.3 West. The
post-tropical cyclone is moving toward the northeast near 28 mph (44
km/h), and this motion is expected to continue overnight.

Maximum sustained winds are near 40 mph (65 km/h) with higher gusts.
Little change in strength is forecast during the next 24 hours.

The estimated minimum central pressure is 998 mb (29.47 inches).


HAZARDS AFFECTING LAND
----------------------
RAINFALL: Post-Tropical Cyclone Ida will produce the following
rainfall totals:

Northern 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 eastern
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. Some 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: The threat for a few tornadoes will continue across the
northern Mid Atlantic into far southern New England through the
remainder of tonight.


NEXT ADVISORY
-------------
Next complete advisory at 500 AM EDT.


Forecaster Hurley

FORECAST POSITIONS AND MAX WINDS

INIT  02/0300Z 40.5N  74.3W   35 KT  40 MPH...POST-TROP/EXTRATROP
 12H  02/1200Z 42.3N  70.1W   35 KT  40 MPH...POST-TROP/EXTRATROP
 24H  03/0000Z 45.3N  64.9W   40 KT  45 MPH...POST-TROP/EXTRATROP