Showers and thunderstorms developed during the afternoon across northeast New Jersey ahead of an approaching backdoor cold front. With relatively weak flow aloft, these storms moved slowly, resulting in heavy rain across some areas.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS OKX wrote it up.
Showers and thunderstorms developed during the afternoon across northeast New Jersey ahead of an approaching backdoor cold front. With relatively weak flow aloft, these storms moved slowly, resulting in heavy rain across some areas. CoCoRaHS observations indicate a widespread 0.5-2 inches of rain in areas that received storms, with the ASOS at Teterboro Airport reporting 2.89 inches of rain. Much of this rain fell over a 1-2 hour time period, resulting in flash flooding.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS New York, NY wrote its last area forecast discussion before the first event at Jul 6, 2:43 PM EST, 35 minutes earlier.
Area Forecast Discussion National Weather Service New York NY 343 PM EDT Mon Jul 6 2020 .SYNOPSIS... A back door cold front passes from the northeast this evening. The front will return northward as a warm front on Tuesday, and pass north by Wednesday morning. Weak high pressure will then briefly build in through Thursday. Low pressure will then approach from the south Friday into Saturday, followed by a series of weak fronts moving through the area late this weekend into early next week. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... Tstms will continue to develop over the region over the next few hours. The greatest risk for svr is across NJ (where there is a watch) then into NYC, wrn LI and the Lower Hudson Valley. CIN is gone is most of these areas, and wrn portions of NJ zones have CAPE abv 2000. Some approaching weak upr lvl support as well as sfc boundaries across the region should help both organization and initiation. There is a flood threat with slow moving storms, especially across NJ zones. Instability weakens by late this eve due to the cooling from tstms as well as the passage of the back door front. There could be some residual shwrs, particular invof the front which will not make very far from the wrn portion of the CWA. The NBM was used for overnight lows. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/... The front returns nwd on Tue as a warm front. Considerable cloudiness is possible due to convective debris and the return of the front. Some shwrs are possible, especially wrn areas where there is the best convergence and some increasing instability. Embedded tstms chances across these wrn areas in the the aftn and eve. Shwrs and possible tstms Tue night. Although sfc based CAPE is low, some elevated activity ahead of the warm front possible which is why chances for tstms were included across nrn zones. High temps were a blend between the CONSALL and NBM. Tricky fcst due to the cloud cover and chances for rain. Breaks could result in a quick warmup late in the day across swrn zones. The blended fcst is between the cooler NAM and the warmer MAV. Tue ngt temps were the NBM. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... The region will lie on the northern edge of broad CONUS ridging through the week. This will be a dirty ridge though, with a weak closed low over the Mississippi River Valley early in the week slowly shearing/lifting toward the area to end the week. Thereafter, models with better agreement of amplifying northern stream troughing approaching/entering the area this weekend, and likely remaining over the area through at least early next week. Before then, a midweek northern stream shortwave moving through S Canada may buckle the ridge enough to provide a trigger for afternoon diurnal convection, particularly Wed. The warm front is expected to be north of the area by early Wednesday morning, with some indication of an earlier mentioned very weak shortwave/buckling of trough moving through aloft. This may present a trigger for late afternoon/early eve isolated to scattered convection Wed, although the focus is a bit more vague at this point and (higher terrain, perhaps sea breeze boundary). This warm frontal passage and SW flow will have widespread high temps climbing into the upper 80s to lower 90s, with widespread heat indices in mid to upper 90s degrees as dewpoints climb into the lower 70s. Heights continue to build on Thursday, but progress of the earlier mentioned shearing southern closed low will have to be monitored as it potentially starts lifting towards the Mid-Atlantic. Quite a bit of model spread on the evolution of this feature and its associated surface wave/low. At this time this feature appears to be far enough SW/S of the region on Thursday, for another hot and humid day. Although a backing wind flow may keep coastal areas a bit cooler than Wed. Only a conditional potential for some isolated convection off terrain and seabreeze boundaries in a likely unstable, but capped and weakly shear environment. If flow remains from the S/SW widespread temps in the upper 80s to lower 90s likely for Thursday with heat indices of 95-100 possible. Forecast details become less certain Friday into the weekend, dependent on the evolution of the southern low as it lifts/shears up the coast, but confidence is increasing in a northern stream trough amplifying down through the Great Lakes/Ohio Valley and then to the East Coast during this time. Considerable model spread exists on the southern low tracking up the coast as early as Friday or as late as Saturday Night, as well as whether it track up the coastal plain or offshore, as well as degree of intensification, and whether it acquires any tropical characteristics. NHC is monitoring the southern system for potential tropical or subtropical development this week, giving it a 30% chance over the next 5 days as it potentially emerges off the Carolina coast. Main threat with this low at this point would be a swath of heavy rainfall along its path as it taps into Gulf and subtropical Atlantic moisture, but low confidence on any details. Better agreement that mean troughing will be sliding towards the east coast through the weekend, with a series of surface troughs moving through the area. Depending on timing of the southern wave, very warm and humid conditions are likely for the weekend, with threat of afternoon convection both days. Each successive trough Sunday into early next week, appears to bring in slightly cooler and drier airmass, but low predictability at this point. && .AVIATION /20Z MONDAY THROUGH SATURDAY/... A weak cold front slowly drops south, passing through the terminals today. The boundary then returns Tuesday as a warm front. Showers and thunderstorms this afternoon could result in brief MVFR or lower conditions, primarily from the NYC metro terminals west. Otherwise, VFR conditions are expected into this evening before MVFR conditions develop at all terminals overnight. The start time of MVFR conditions tonight could be off by 1-2 hours. MVFR conditions are then expected to continue into Tuesday morning before gradually improving to VFR by late morning/early afternoon. SE to ESE winds will continue this afternoon at around 10 kt, with a period of sustained winds 10-15 kt possible late this afternoon, primarily at coastal terminals. Winds then gradually diminish this evening before falling to around 5 kt overnight. ESE winds will then increase to 5-10 kt Tuesday morning. .OUTLOOK FOR 18Z TUESDAY THROUGH SATURDAY... .Tuesday afternoon-Thursday...Afternoon/evening showers and thunderstorms possible, mainly from the NYC metros north/west. .Friday-Saturday...MVFR or lower conditions possible in rain. Chance Chance E-SE gusts 20-25kt. && .MARINE... Sub-SCA conditions expected through mid week though waves over the ocean remain between 3-4 feet. SCA seas are likely Friday into the weekend with a persistent S/SW flow and strengthening wind fields owing to a possible coastal low nearing the region. && .HYDROLOGY... There is a localized flash flood threat this aftn and eve, mainly from wrn LI to the lower Hudson Valley and points w. Any strong tstms that develop could be slow moving and produce areas of flooding. A localized urban and poor drainage flooding threat exists with any isolated thunderstorm activity Wed and Thu, as it will be slow moving and able to tap into a very moist environment. There is potential for more widespread downpour/thunderstorm activity and resultant urban and poor drainage flooding threat during the Friday/Saturday period, but low confidence on details at this timeframe. More details as the week progresses. && .TIDES/COASTAL FLOODING... The combination of a SE swell and high astronomical tides (full moon) will have water levels approach minor flood thresholds once again tonight, but they are expected to remain just below minor flood benchmarks. && .EQUIPMENT... NYC NOAA Weather Radio Station KWO35 (162.55 MHz) is undergoing its final stages of testing, and is operating at full power. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...None. &&
Hazardous Weather Outlook National Weather Service New York NY 142 PM EDT Mon Jul 6 2020 NJZ002-004-006-103>108-071745- Western Passaic-Eastern Passaic-Hudson-Western Bergen-Eastern Bergen- Western Essex-Eastern Essex-Western Union-Eastern Union- 142 PM EDT Mon Jul 6 2020 ...SEVERE THUNDERSTORM WATCH 333 IN EFFECT UNTIL 11 PM EDT THIS EVENING... This Hazardous Weather Outlook is for northeast New Jersey. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time that would meet NWS warning criteria. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches, warnings, and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. ANZ338-CTZ005-009-NYZ067>075-078-080-176>179-071745- New York Harbor-Northern Fairfield-Southern Fairfield-Orange-Putnam- Rockland-Northern Westchester-Southern Westchester- New York (Manhattan)-Bronx-Richmond (Staten Island)-Kings (Brooklyn)- Northwestern Suffolk-Southwestern Suffolk-Northern Queens- Northern Nassau-Southern Queens-Southern Nassau- 142 PM EDT Mon Jul 6 2020 This Hazardous Weather Outlook is for Atlantic coastal waters, southern Connecticut and southeast New York. .DAY ONE...This afternoon and tonight. Some thunderstorms this afternoon may be capable of producing damaging winds. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time that would meet NWS warning criteria. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches, warnings, and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. ANZ335-345-355-071745- Long Island Sound West of New Haven CT/Port Jefferson NY- South Shore Bays from Jones Inlet through Shinnecock Bay- Sandy Hook NJ to Fire Island Inlet NY out 20 nm- 142 PM EDT Mon Jul 6 2020 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...This afternoon and tonight. Some thunderstorms this afternoon may be capable of producing winds over 35 kt. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time that would meet NWS warning criteria. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches, warnings, and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. ANZ330-340-350-353-071745- Long Island Sound East of New Haven CT/Port Jefferson NY- Peconic and Gardiners Bays- Moriches Inlet NY to Montauk Point NY out 20 nm- Fire Island Inlet NY to Moriches Inlet NY out 20 nm- 142 PM EDT Mon Jul 6 2020 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...This afternoon and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time that would meet NWS warning criteria. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches, warnings, and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. CTZ006>008-010>012-NYZ079-081-071745- Northern New Haven-Northern Middlesex-Northern New London- Southern New Haven-Southern Middlesex-Southern New London- Northeastern Suffolk-Southeastern Suffolk- 142 PM EDT Mon Jul 6 2020 This Hazardous Weather Outlook is for southern Connecticut and southeast New York. .DAY ONE...This afternoon and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time that would meet NWS warning criteria. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches, warnings, and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria.
Special Weather Statement
National Weather Service New York NY
302 PM EDT Mon Jul 6 2020
NJZ103-104-NYZ071>073-061945-
Western Bergen-Eastern Bergen-Bronx-Southern Westchester-New York
(Manhattan)-
302 PM EDT Mon Jul 6 2020
...A STRONG THUNDERSTORM WILL AFFECT BERGEN...SOUTHERN WESTCHESTER...
BRONX AND NEW YORK (MANHATTAN) COUNTIES...
At 301 PM EDT, a strong thunderstorm was located over Paramus, moving
southeast at 10 mph.
Winds in excess of 40 mph and pea size hail are possible with this
storm.
This storm will be near...
Oradell around 310 PM EDT.
Hackensack and Teterboro around 325 PM EDT.
Bergenfield and Norwood around 330 PM EDT.
Yonkers and Ridgefield around 345 PM EDT.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4079 7399 4082 7402 4082 7403 4091 7413
4092 7413 4092 7414 4097 7414 4098 7416
4107 7408 4104 7400 4100 7390 4100 7389
4097 7379 4077 7397
TIME...MOT...LOC 1901Z 298DEG 8KT 4097 7406
NVPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW YORK NY
334 PM EDT MON JUL 06 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0332 PM HAIL ROCHELLE PARK 40.91N 74.08W
07/06/2020 M1.00 INCH BERGEN NJ TRAINED SPOTTER
&&
MWPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW YORK NY
339 PM EDT MON JUL 06 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0335 PM HAIL PARAMUS 40.95N 74.07W
07/06/2020 M1.00 INCH BERGEN NJ TRAINED SPOTTER
&&
MWSpecial Weather Statement
National Weather Service New York NY
348 PM EDT Mon Jul 6 2020
NJZ006-105>108-062030-
Hudson-Eastern Union-Eastern Essex-Western Union-Western Essex-
348 PM EDT Mon Jul 6 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT HUDSON...UNION AND
ESSEX COUNTIES...
At 348 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Morris Plains to Linden. The storms
are nearly stationary.
Wind gusts up to 50 mph and half inch hail are possible with these
storms.
Locations impacted include...
Newark, Elizabeth, Summit, Millburn, Harrison, Caldwell, Orange,
Clark, Fairfield, Union, East Orange, Irvington, West Orange,
Montclair and Westfield.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 4070 7443 4073 7438 4076 7436 4076 7438
4077 7437 4079 7437 4082 7433 4085 7433
4086 7432 4087 7434 4089 7434 4091 7433
4091 7429 4069 7408 4061 7432 4061 7435
TIME...MOT...LOC 1948Z 000DEG 0KT 4082 7444 4063 7424
NVPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW YORK NY
355 PM EDT MON JUL 06 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0355 PM HAIL HASBROUCK HEIGHTS 40.86N 74.07W
07/06/2020 M1.25 INCH BERGEN NJ TRAINED SPOTTER
&&
MWPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW YORK NY
356 PM EDT MON JUL 06 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0356 PM TSTM WND GST HASBROUCK HEIGHTS 40.86N 74.07W
07/06/2020 E60 MPH BERGEN NJ TRAINED SPOTTER
&&
MWThe Brookhaven radar (KOKX), 98 km away, was scanning. The volume nearest the first event began at 20:15 UTC.
7 flash flood. Local standard time, as filed.
Multiple mPING reports of streets flooded and vehicles stranded in Bogota.
Vehicles reported stranded on East 1st Avenue in Roselle due to flooding.
River Drive in Garfield was flooded with multiple stranded vehicles. The fire department was responding with water rescue boats.
A woman drove into deep water near High Street and Benson Avenue in Passaic. After escaping the car, both the woman and the car were carried towards a viaduct opening. The woman traveled through the viaduct for about one mile before it emptied into the Passaic River, where she was able to swim to safety and exit the river, uninjured, along Carneer Avenue in Rutherford. Her car was later located in the viaduct under Brook Avenue near River Road.
Route 17 southbound in Paramus was flooded in the vicinity of Midland Avenue with water halfway up car tires. At least one car stalled.
The Hackensack Fire Department rescued at least 17 people from vehicles stuck in high water, including at the intersection of Green Street and Lodi Street and West Pleasantview Avenue near the entrance to Stop and Shop. The fire department reported that the water was as high as three quarters of the way up car doors.
Grand Avenue was flooded with a stranded vehicle in River Edge. The police and fire departments were responding for a water rescue.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Jersey in 2020Every state in 2020This day in weather historyWarnings in New Jersey, July 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 904704, 904705, 904706, 904715, 904716, 904717, 904708.