The remnants of Hurricane Ida impacted the mid-Atlantic on September 1, 2021. As it moved northward, Ida began transitioning to a strong mid-latitude cyclone with pronounced frontal features, but with continued tropical moisture. On a regional level, the remnants of Ida became one of the most severe natural disasters in US history, due to a combination of several tornadoes, some of them strong, as well as catastrophic flooding over a large and densely populated area. The severe weather threat unfolded as the system's developing warm front lifted northward from the Delmarva region into Pennsylvania and New Jersey. South of the warm front, partial clearing and moderate to strong instability developed. Meanwhile, very strong shear and forcing, along with tropical moisture, were present within the warm sector. The result was widespread convection in the form of both supercell and quasi-linear thunderstorms. A number of storms became severe across the region, producing several tornadoes and other instances of wind damage. This continued an exceptionally active stretch of high end severe weather in the region, coming barely a month after the tornado outbreak of July 29.

Tornado in MERCER, NEW JERSEY
From 01-SEP-21 18:32:00 to 01-SEP-21 18:35:00 (EST-5)
Location: CLARKSVILLE
Tornado F-scale: EF0
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down along Emmons Drive along Route 1 in
Princeton, NJ as a remnant supercell moved northward after
producing the Mullica Hill and Burlington, NJ tornadoes earlier
Wednesday afternoon as Ida's remnants moved through the region.
Damage first occurred as several small branches were brought down
along the Whole Foods and Wendy's parking lots along Route 1 in
far eastern Princeton Township, with a continued path of minor
branch damage extending northward along Farber Road, Meadow Drive,
and Canal Pointe Boulevard adjacent to Route 1. Several medium-
size trees were also uprooted with numerous small branches having
been brought down along the western periphery of the Marketfair
shopping parking lot.
From there, the tornado continued northward with minor tree
damage having occurred along Carnegie Center Boulevard as the
tornado moved northward. Several small branches were also brought
down in a residential area along Heritage Boulevard with one pine
tree even having been snapped. An additional pine tree was also
uprooted along Alexander Road near Glenview. The tornado then
snapped several small hardwood trees, knocking down several
utility poles and power lines along Washington Road. A tree was
also uprooted along Lower Harrison Street along Carnegie Lake
before the tornado lifted somewhere over the lake.

Thunderstorm Wind in CAMDEN, NEW JERSEY
From 01-SEP-21 17:40:00 to 01-SEP-21 17:40:00 (EST-5)
Location: OAKLYN
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Several softwood trees and utility poles were snapped, and there was loss of siding on some homes along Cuthbert Rd, Lees Ln, and Heather Rd. Damage occurred downstream of an earlier tornado, but it was inconclusive as to whether this was tornado damage and is believed more likely to be straight line wind.

Thunderstorm Wind in CAMDEN, NEW JERSEY
From 01-SEP-21 17:40:00 to 01-SEP-21 17:40:00 (EST-5)
Location: ERLTON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Multiple trees and wires were downed around Cherry Hill. Time estimated from radar.

Thunderstorm Wind in BURLINGTON, NEW JERSEY
From 01-SEP-21 18:06:00 to 01-SEP-21 18:06:00 (EST-5)
Location: BURLINGTON
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Measured by nos gauge bdrn4.

Tornado in BURLINGTON, NEW JERSEY
From 01-SEP-21 17:59:00 to 01-SEP-21 18:03:00 (EST-5)
Location: BEVERLY
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

After cycling from an earlier tornado near Mullica Hill, NJ, a
supercell thunderstorm produced an additional tornado in
Burlington Township, NJ near the township line with Edgewater
Park, NJ. Some evidence of RFD winds was prevalent southward
through the Capitol Hill neighborhood of Edgewater Park with one
pine tree being uprooted and several small branches being brought
down all the way south to Pennington Park in Delanco Township,
NJ,but damage was too sparse to be noted as tornadic. As the
tornado touched down, numerous hard and softwood trees were
uprooted along Jennifer Lane in a neighborhood just off of Beverly
Road in Burlington Township. A large branch was also brought down
on a vehicle at the intersection of Jennifer Lane and Squire Way.
Nearby, a pine tree was brought down, breaking a window to a
residence further west on Jennifer Lane with a small Sycamore tree
also being snapped at the base a few houses down the road.
As the tornado crossed Shive Place and Handler Drive, several
trees were snapped and large branches brought down. Soffit damage
was also observed to a couple of homes nearby. Perhaps the most
impressive damage was observed along Beverly Road near the
intersection with Handler Drive where resident noted that nearly
thirty trees were either uprooted or snapped. Observations seemed
to agree with that statement with crews working to repair downed
power lines as well.
The tornado then proceeded towards the Delaware River as it took
a slight turn towards the north. With only a steel and power plant
lying beneath it-these two structurally sound facilities did not
appear to sustain any visible damage despite a rather impressive
viral Tweet with a video of the tornado passing across the
Burlington-Bristol Bridge. Driving across the bridge for this very
survey, no damage was noted given the structural integrity of the
feature. The tornado continued into Bucks County, Pennsylvania.

Tornado in GLOUCESTER, NEW JERSEY
From 01-SEP-21 17:10:00 to 01-SEP-21 17:30:00 (EST-5)
Location: HARRISONVILLE
Tornado F-scale: EF3
Property damage: 5.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado touched down near Harrisonville, NJ doing mostly
damage to trees and limbs before strengthening and moving
northeast. As it moved to the northeast, it crossed into the Cedar
Grove area producing more significant damage to trees with many
trees uprooted.
The tornado moved into the Willow Oaks subdivision strengthening
further and producing significant damage to trees, as well as
serious structural damage to a number of homes. Several homes had
exterior walls completely collapsed, a number of homes lost roofs
and upper story walls, and one home had only a few interior walls
remaining. Vehicles were tossed around and moved, and damage from
flying debris was observed in several spots.
The tornado continued to move to the northeast to Bridgeton Pike
where multiple trees had trunks snapped and most of the barns and
storage buildings at a large commercial farm were completely
destroyed. The tornado also reached its maximum width at this
location and was estimated to be around 400 yards wide.
The tornado then continued northeast through the woods with
multiple trees snapped before entering the subdivision at
Salvatore Drive. Here the tornado's most significant damage was
observed with one home completely destroyed with no interior or
exterior walls standing. Other homes in the subdivision had
exterior walls collapsed along with garage collapses and vehicles
being tossed around by the tornadic winds. The consistency of the
damage along the path of the tornado in this area was EF-3 in the
middle of the circulation, with EF-2 along the edge of the
circulation. In addition, the tree damage was not as extensive
behind the completely destroyed house. Based on the consistency of
the damage along Salvatore Drive, a rating of EF-3 (150 mph) was
determined.
The tornado continued to the northeast damaging trees and
structures along its path before reaching a large commercial dairy
farm where extensive damage occurred. Barns were destroyed and
two large grain silos were toppled. The tornado then crossed
Jefferson Road and crossed Eachus Road snapping multiple trees.
Thereafter, the tornado moved into the Breakneck Road area
producing complete deforestation with nearly 100 percent of the
trees in a thickly wooded area snapped.
The tornado path crossed Main St, just south of Chestnut Branch
Park in Mantua Township snapping and uprooting a number of trees
before reaching the Delaware Valley Florist commercial greenhouse
mostly destroying the structure. The tornado damage path then
continued to the northeast reaching Wenonah, snapping and
uprooting a number of trees, a few homes lost roofs and one
structure collapsed.
Less severe tree damage persisted to the northeast along the
tornado's path toward Deptford where the tornado lifted.