Tropical Storm Isaias brought high winds, heavy rain, several tornadoes, and coastal flooding to the mid-Atlantic region, becoming the most impactful tropical cyclone to impact most of the region since Sandy in 2012.

Flash Flood in GLOUCESTER, NEW JERSEY
From 04-AUG-20 10:00:00 to 04-AUG-20 12:00:00 (EST-5)
Location: MANTUA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

NJ Route 45 was closed near Berkley Road in Mantua Township due to flooding.

Flash Flood in WARREN, NEW JERSEY
From 04-AUG-20 11:15:00 to 04-AUG-20 13:30:00 (EST-5)
Location: BROADWAY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

NJ Route 57 was closed at Asbury Broadway Road in Franklin Township due to flooding.

Flash Flood in CUMBERLAND, NEW JERSEY
From 04-AUG-20 08:45:00 to 04-AUG-20 11:00:00 (EST-5)
Location: MILLVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

NJ Route 47 was closed at Broad Street in Millville due to flooding.

Coastal Flood in NORTHWESTERN BURLINGTON, NEW JERSEY
From 04-AUG-20 14:30:00 to 04-AUG-20 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Moderate tidal flooding occurred.  There was roadway flooding in some of the tidal areas of northwestern Burlington County along the Delaware River and its tidal tributaries.

Tornado in CAPE MAY, NEW JERSEY
From 04-AUG-20 08:45:00 to 04-AUG-20 08:50:00 (EST-5)
Location: STRATHMERE
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A waterspout came ashore near the southern end of Corson���s
Inlet State Park near Strathmere then across marshy areas. The
tornado then crossed the Garden State Parkway then tracked along
Route 9 across the south side of Marmora. There were several
pictures and videos of the waterspout and tornado including a
trained spotter reporting a tornado on the ground with debris in
the air. The tornado produced significant damage to homes and
businesses on the 500 block of Route 9, starting in the vicinity
of a Coca Cola facility where containers were tossed around with
even a truck trailer flipped onto its side. Adjacent to the Coca
Cola facility, a large shed at a residence was upended and
vehicles were moved from their original locations. Several homes
had portions of their roofs blown off with a couple of homes
sustaining significant damage to a side wall or corner walls. The
tornado crossed Route 9 to the Pine Hill Mobile Home Court where
significant damage occurred to trees and buildings. One home was
shifted off its foundation and others had roof damage and downed
trees crushed several cars. The tornado tracked north northwest
crossing Tuckahoe Road and may have dissipated over the adjacent
marsh areas. Doppler radar data showed a well defined tornado
debris signature as the tornado moved through portions of Marmora.

Flash Flood in HUNTERDON, NEW JERSEY
From 04-AUG-20 11:50:00 to 04-AUG-20 13:30:00 (EST-5)
Location: REAVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Minor flooding occurred along the Neshanic River in the Reaville area.

Flash Flood in HUNTERDON, NEW JERSEY
From 04-AUG-20 12:30:00 to 04-AUG-20 13:30:00 (EST-5)
Location: LITTLE YORK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Minor flooding occurred along the Musconetcong River in the Bloomsbury area.

Tropical Storm in WESTERN CAPE MAY, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Mesonet

Multiple observations of 40 to 60 mph sustained winds with higher gusts were measured. Downed trees and power lines were reported.

Tropical Storm in EASTERN CAPE MAY, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Mesonet

Multiple observations of 40 to 60 mph sustained winds with higher gusts were recorded. Downed trees and power lines were reported, in addition to locally enhanced damage caused by a waterspout coming onshore as a tornado.

Tornado in OCEAN, NEW JERSEY
From 04-AUG-20 09:50:00 to 04-AUG-20 09:54:00 (EST-5)
Location: BRANT BEACH
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A waterspout developed in Manahawkin Bay between Ship Bottom and
Brant Beach. It tracked northwestward and video footage showed the
circulation with light debris in the air crossing the Route 72
bridge over the bay. The waterspout then continued tracking to the
northwest and passed east of Mud City before moving ashore into a
marshy area of the Manahawkin Wildlife Management area. Other
than some light debris reported in the air as it crossed the Route
72 bridge, no other damage reports have been received as of this
report. However, the circulation tracked right over the Long Beach
Island WeatherFlow weather station located north of Egg Island
and west of Flat Island in Manahawkin Bay which measured a 109 mph
wind gust at 10:53 AM EDT. This measurement was used to rate this
waterspout/tornado given the lack of actual damage. Doppler radar
data showed no evidence of a tornado debris signature. Doppler
radar data however did indicate velocities to 112 mph at about
1,600 feet above the ground very near the aforementioned weather
station.

Tropical Storm in WESTERN ATLANTIC, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: ASOS

Multiple measurements were made of 40 to 50 mph sustained winds with higher gusts, including at Atlantic City International Airport (KACY). Downed trees and power lines were reported.

Tropical Storm in EASTERN ATLANTIC, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Mesonet

Sustained winds of 40 to 50 mph with higher gusts were measured. Tree and utility damage occurred as a result.

Tropical Storm in CUMBERLAND, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: ASOS

Multiple observations were made of 40 to 60 mph sustained winds including at Millville Municipal Airport (KMIV). Numerous reports of downed trees and power lines were received.

Tropical Storm in WESTERN OCEAN, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Mesonet

Multiple observations of 40 to 55 mph sustained winds with higher gusts were recorded. Numerous reports of downed trees and power lines were received.

Tropical Storm in HUNTERDON, NEW JERSEY
From 04-AUG-20 09:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Public

Multiple reports of downed trees and power lines were received, especially near Readington Twp where a 51 mph wind gust was also measured. Sustained tropical storm force winds likely occurred.

Tropical Storm in EASTERN OCEAN, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Sustained winds of 40 to 55 mph with higher gusts were measured. Tree and utility damage occurred, with locally enhanced damage near Ship Bottom due to a tornado. A 109 mph wind gust was measured on Long Beach Island when the sensor was hit by that tornado.

Tropical Storm in SALEM, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Mesonet

A NJWxNet site at Lower Alloways Creek measured a sustained wind of 44 mph. Downed trees and power lines were reported in the county.

Tropical Storm in GLOUCESTER, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Public

A number of reports of downed trees and power lines were received in the county. No confirmed observations of sustained tropical storm force winds were received, likely due to lack of available data, but damage reports and observations from surrounding areas suggest such winds likely occurred.

Tropical Storm in NORTHWESTERN BURLINGTON, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Mesonet

Multiple observations of 40 to 50 mph sustained winds were recorded. Numerous trees and power lines were downed.

Tropical Storm in CAMDEN, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Other Federal Agency

An anemometer in Waterford Works measured a 60 mph wind gust, which combined with surrounding observations suggest sustained tropical storm force winds very likely occurred. Numerous reports of downed trees and power lines were received.

Tropical Storm in MORRIS, NEW JERSEY
From 04-AUG-20 09:00:00 to 04-AUG-20 15:30:00 (EST-5)
Reported by: Department of Highways

Numerous reports of downed trees and power lines were received. The Morristown AWOS (KMMU) measured a 59 mph wind gust, and sustained tropical storm force winds very likely occurred in the county.

Tropical Storm in WARREN, NEW JERSEY
From 04-AUG-20 09:30:00 to 04-AUG-20 15:30:00 (EST-5)
Reported by: Public

A number of downed trees and power lines were reported. No observations of sustained tropical storm force winds were received, but observations from surrounding areas suggest that such winds likely occurred.

Tropical Storm in SUSSEX, NEW JERSEY
From 04-AUG-20 10:00:00 to 04-AUG-20 15:30:00 (EST-5)
Reported by: COOP Observer

A number of reports of downed trees and power lines were reported, including by a COOP observer at Highland Lakes who had his equipment destroyed by a falling tree. Observations from surrounding areas suggest sustained tropical storm force winds likely occurred.

Tropical Storm in SUSSEX, NEW JERSEY
From 04-AUG-20 10:00:00 to 04-AUG-20 15:30:00 (EST-5)
Reported by: COOP Observer

A number of reports of downed trees and power lines were reported, including by a COOP observer at Highland Lakes who had his equipment destroyed by a falling tree. Observations from surrounding areas suggest sustained tropical storm force winds likely occurred.

Tropical Storm in SOUTHEASTERN BURLINGTON, NEW JERSEY
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Public

A CWOP site in Tabernacle reported a 53 mph wind gust. Downed trees and power lines were reported, and sustained tropical storm force winds almost certainly occurred.

Tropical Storm in EASTERN MONMOUTH, NEW JERSEY
From 04-AUG-20 08:30:00 to 04-AUG-20 15:30:00 (EST-5)
Crop damage: 0.00K
Reported by: Mesonet

Sustained winds of 45 to 55 mph with higher gusts were measured near Manasquan and Sandy Hook.

Tropical Storm in WESTERN MONMOUTH, NEW JERSEY
From 04-AUG-20 08:30:00 to 04-AUG-20 15:30:00 (EST-5)
Reported by: Mesonet

A Rutgers University owned gauge in Upper Freehold Twp measured a 41 mph sustained wind. A number of downed trees and power lines were reported.

Tropical Storm in MERCER, NEW JERSEY
From 04-AUG-20 08:30:00 to 04-AUG-20 15:30:00 (EST-5)
Reported by: ASOS

Multiple observations of sustained 40 to 50 mph winds with higher gusts were made, including at Trenton Mercer Airport (KTTN). Numerous reports of downed trees and power lines were received.

Tropical Storm in MIDDLESEX, NEW JERSEY
From 04-AUG-20 09:00:00 to 04-AUG-20 15:30:00 (EST-5)
Reported by: Mesonet

A Weatherflow gauge at Perth Amboy measured a 66 mph wind gust. Widespread reports of downed trees and power outages were received.

Tropical Storm in SOMERSET, NEW JERSEY
From 04-AUG-20 08:30:00 to 04-AUG-20 15:30:00 (EST-5)
Reported by: Public

Multiple observations of 40 to 45 mph sustained winds with higher gusts were recorded, along with widespread downed trees and power outages.

Flash Flood in WARREN, NEW JERSEY
From 04-AUG-20 11:00:00 to 04-AUG-20 13:00:00 (EST-5)
Location: HACKETTSTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Widespread roadway flooding in Hackettstown.