Showers and thunderstorms developed along a pre-frontal trough ahead of an approaching cold front. With weak steering flow in place, these storms were able to produce 1-2 inches of rainfall in a short amount of time, leading to isolated reports of flash flooding across portions of Bergen County.
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 along a pre-frontal trough ahead of an approaching cold front. With weak steering flow in place, these storms were able to produce 1-2 inches of rainfall in a short amount of time, leading to isolated reports of flash flooding across portions of Bergen County. The ASOS at Teterboro Airport reported 1.52 inches of rain during this event.
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 Aug 3, 6:07 PM EST, 3 hours 59 minutes earlier.
Area Forecast Discussion National Weather Service New York NY 707 PM EDT Sat Aug 3 2019 .SYNOPSIS... A weak cold front will move through the region early on Sunday. The front will then stall just south of the region through Sunday night before slowly returning north as a warm front into Monday as high pressure builds from the west and quickly moves offshore. A slow moving frontal system then impacts the region for the mid week, before high pressure returns for next weekend. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... Any convective activity should gradually dissipate throughout this evening with a loss of daytime heating, while the activity slowly moves east and southeast. Cannot rule out some locally heavy rain that could lead to minor poor drainage type flooding across mainly interior zones. Also a few strong wind gusts may accompany thunderstorms this evening, mainly across far northern sections before the activity weakens and dissipates. The cold front behind the pre-frontal trough moves through overnight across interior sections, and should get into and just through the city by about 9z. Much of the guidance then has the boundary clearing far eastern sections towards and just after 12z with dew points beginning to decrease across northern zones. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/... The cold front that moves across Sunday will settle across the southern portion of the coastal waters, just south of the region throughout the day. Instability values do come down primarily across the board, although the HRRR does keep some CAPE leftover across far southern and southeastern parts of the CWA. The MET and MAV guidance is adamant about it remaining dry with low POPs, but there are some higher res guidance suggesting some precip activity at various times throughout the day. Therefore, thought it prudent to go with a slight chance POPs across the entire area as the front does not sufficiently clear the entire region out from the previous air mass and there may be enough with spokes of energy with the northern branch in the mid levels to trigger some showers. The best chance may be for the late morning and early afternoon, but thought it best not to get overly detailed as far as timing of any precip chances for Sunday. Weak high pressure out of the Great Lakes should begin to build in enough to keep things completely dry for Sunday night into Monday morning. This will lead to a somewhat more discernible drop in dew points / humidity levels by Monday morning. && .LONG TERM /MONDAY THROUGH SATURDAY/... Large scale blocking pattern with dominant high pressure over the Southwestern U.S. and the Bermuda high will place our region in a more unsettled period with a series of upper troughs and smaller scale short waves moving through. At the surface, a nearly stalled frontal boundary will quickly return north as a warm front on Monday as high pressure shifts offshore. Chances of precipitation will be the lowest Monday, with subsidence aloft and drier air overcoming any lift from the front. By Monday night into Tuesday, flow aloft becomes more west- southwesterly as upper troughs begin to phase. As a result, moisture begins to increase, with PWATs approaching two inches by Thursday. There has been some consistent consensus for the best chance of any rain and/or thunderstorms to be Wednesday and Thursday. Trended more towards the Canadian/Euro as the GFS appears to wet in the extended. There is still some uncertainty on the timing of smaller scale waves that will move through, which lowers confidence on timing of any potentially heavier periods of showers and thunderstorms, though it is likely that most will be diurnally driven. The system then finally begins to progress east of the area into the weekend. && .AVIATION /23Z SATURDAY THROUGH THURSDAY/... A pre frontal trough will be remain over southern New England to southeastern Pennsylvania this evening and early tonight, as a cold front slowly approaches, and moves through early Sunday morning. Will watch convection moving through portions of the interior, with KSWF, and CT terminals possibly impacted this evening. Otherwise, coverage of showers/thunderstorms should diminish as the night progresses. A few showers or thunderstorms are possible Sunday afternoon, but most areas remain dry. Winds become light tonight, and shift to light north by Sunday morning. Winds increase to 5-10 kt from the N/NW as the morning progresses, with some sea breeze development possible during the afternoon for CT terminals, KJFK and KISP. .OUTLOOK FOR 00Z MONDAY THROUGH THURSDAY... .Sunday night-Monday...VFR. .Tuesday...Mainly VFR, MVFR possible late in showers and thunderstorms. .Wednesday-Thursday...Mainly VFR, MVFR possible in scattered to isolated showers and thunderstorms. && .MARINE... A weak pressure gradient through early next week will lead to sub-SCA winds and seas. South-southwest flow then becomes more persistent into the mid week as a frontal system slowly approaches the waters, allowing ocean seas to build due to the increasing swell. && .HYDROLOGY... Some localized flooding for urban and poor drainage areas is possible in associated with any thunderstorms this evening. Periods of locally heavy rainfall may be possible with thunderstorms that develop on Wednesday and Thursday, which may result in localized flooding for urban and poor drainage areas. && .TIDES/COASTAL FLOODING... Some of the western south shore back bay locations will approach minor coastal flood benchmarks for the high tide cycles for this evening, and should fall just short of coastal flood benchmarks for Sunday evening. A coastal flood statement remains in effect for the Western south shore back bays for this evening. No statements for Sunday evening are planned at this time. && .EQUIPMENT... NYC NOAA Weather Radio Station KWO35 (162.55 MHz) remains off the air. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...None. && SYNOPSIS...MD/JE NEAR TERM...JE SHORT TERM...JE LONG TERM...MD AVIATION...PW MARINE...MD/JE HYDROLOGY...MD/JE TIDES/COASTAL FLOODING... EQUIPMENT...
Hazardous Weather Outlook National Weather Service New York NY 450 PM EDT Sat Aug 3 2019 NJZ004-006-103>108-NYZ071>075-078>081-176>179-042100- Eastern Passaic-Hudson-Western Bergen-Eastern Bergen-Western Essex- Eastern Essex-Western Union-Eastern Union-Southern Westchester- New York (Manhattan)-Bronx-Richmond (Staten Island)-Kings (Brooklyn)- Northwestern Suffolk-Northeastern Suffolk-Southwestern Suffolk- Southeastern Suffolk-Northern Queens-Northern Nassau-Southern Queens- Southern Nassau- 450 PM EDT Sat Aug 3 2019 This Hazardous Weather Outlook is for northeast New Jersey and southeast New York. .DAY ONE...Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. ANZ330-335-338-340-345-350-353-355-042100- Long Island Sound East of New Haven CT/Port Jefferson NY- Long Island Sound West of New Haven CT/Port Jefferson NY- New York Harbor-Peconic and Gardiners Bays- South Shore Bays from Jones Inlet through Shinnecock Bay- Moriches Inlet NY to Montauk Point NY out 20 nm- Fire Island Inlet NY to Moriches Inlet NY out 20 nm- Sandy Hook NJ to Fire Island Inlet NY out 20 nm- 450 PM EDT Sat Aug 3 2019 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. CTZ005>012-NJZ002-NYZ067>070-042100- Northern Fairfield-Northern New Haven-Northern Middlesex- Northern New London-Southern Fairfield-Southern New Haven- Southern Middlesex-Southern New London-Western Passaic-Orange-Putnam- Rockland-Northern Westchester- 450 PM EDT Sat Aug 3 2019 This Hazardous Weather Outlook is for southern Connecticut, northeast New Jersey and southeast New York. .DAY ONE...Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Sunday through Friday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW YORK NY
906 PM EDT SAT AUG 03 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0856 PM TSTM WND DMG SOMERS 41.33N 73.69W
08/03/2019 WESTCHESTER NY SOCIAL MEDIA
TREE LIMBS DOWN AND YARD FURNATURE TOSSED AND DAMAGED
DUE TO THUNDERSTORM WIND GUSTS.
&&
TMSpecial Weather Statement
National Weather Service New York NY
908 PM EDT Sat Aug 3 2019
CTZ009-NYZ070-071-040200-
Southern Fairfield-Southern Westchester-Northern Westchester-
908 PM EDT Sat Aug 3 2019
...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN FAIRFIELD AND CENTRAL
WESTCHESTER COUNTIES...
At 908 PM EDT, a strong thunderstorm was located over Mount Kisco,
moving southeast at 15 mph.
Winds in excess of 40 mph are possible with this storm.
Locations impacted include...
Stamford, Norwalk, New Rochelle, White Plains, Port Chester,
Ossining, New Canaan, Rye, Mount Kisco, Greenwich, Harrison, Darien,
Scarsdale, Hawthorne and Bedford.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4106 7337 4101 7350 4100 7354 4099 7356
4100 7359 4093 7370 4090 7377 4121 7392
4132 7362
TIME...MOT...LOC 0108Z 332DEG 14KT 4120 7375
PWSpecial Weather Statement
National Weather Service New York NY
924 PM EDT Sat Aug 3 2019
NJZ002-103-NYZ067>070-040230-
Western Bergen-Western Passaic-Putnam-Rockland-Northern
Westchester-Orange-
924 PM EDT Sat Aug 3 2019
...A STRONG THUNDERSTORM WILL AFFECT WESTERN PASSAIC...NORTHERN
WESTCHESTER...ORANGE...WESTERN PUTNAM AND ROCKLAND COUNTIES...
At 922 PM EDT, a strong thunderstorm was located near Vernon Valley,
or 7 miles west of Warwick, moving east at 20 mph. Other storms were
scattered across Orange and Rockland Counties moving east, southeast
at 20 mph.
Winds in excess of 30 mph and half inch hail are possible with some
of this activity.
Locations impacted include...
Middletown, West Milford, Peekskill, Ringwood, Suffern, Mahopac,
Monroe, West Point, Warwick, Goshen, Sloatsburg, Cold Spring,
Howells, New Windsor and Bloomingdale.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4150 7455 4150 7448 4152 7446 4148 7400
4146 7400 4144 7398 4147 7395 4147 7392
4132 7364 4120 7394 4100 7433 4111 7448
4120 7437 4130 7458
TIME...MOT...LOC 0122Z 270DEG 19KT 4128 7450
PWSpecial Weather Statement
National Weather Service New York NY
955 PM EDT Sat Aug 3 2019
CTZ009-NYZ069>071-040245-
Southern Fairfield-Rockland-Southern Westchester-Northern
Westchester-
955 PM EDT Sat Aug 3 2019
...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN FAIRFIELD...CENTRAL
WESTCHESTER AND ROCKLAND COUNTIES...
At 954 PM EDT, a strong thunderstorm was located over Ossining,
moving east at 20 mph. Another strong storm was near White Plains.
Winds in excess of 30 mph are possible with these storms.
Locations impacted include...
Stamford, Norwalk, White Plains, New City, Port Chester, Ossining,
New Canaan, Rye, Haverstraw, Tarrytown, Mount Kisco, Dobbs Ferry,
Nyack, Greenwich and Harrison.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4114 7406 4129 7372 4110 7333 4100 7354
4099 7356 4100 7359 4091 7371
TIME...MOT...LOC 0154Z 290DEG 18KT 4117 7386
PWSpecial Weather Statement
National Weather Service New York NY
1027 PM EDT Sat Aug 3 2019
CTZ009-NJZ004-006-103>106-NYZ069>071-073-040315-
Southern Fairfield-Hudson-Eastern Essex-Western Bergen-Western
Essex-Eastern Bergen-Eastern Passaic-Rockland-Bronx-Southern
Westchester-Northern Westchester-
1027 PM EDT Sat Aug 3 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN FAIRFIELD...
HUDSON...EASTERN PASSAIC...BERGEN...ESSEX...CENTRAL WESTCHESTER...
BRONX AND ROCKLAND COUNTIES...
At 1027 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Monsey to Riverdale to Dover.
Movement was east at 35 mph.
Winds in excess of 30 mph are possible with these storms.
Locations impacted include...
Yonkers, Paterson, Stamford, Norwalk, Passaic, White Plains, Wayne,
Bloomfield, Hackensack, New City, Orange, Port Chester, Bergenfield,
Paramus and Ossining.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4077 7437 4080 7437 4082 7433 4086 7432
4087 7434 4090 7433 4091 7429 4089 7428
4090 7427 4093 7429 4105 7426 4117 7405
4125 7381 4110 7336 4094 7376 4086 7391
4088 7391 4088 7393 4084 7396 4075 7414
TIME...MOT...LOC 0227Z 254DEG 33KT 4115 7405 4100 7431 4087 7456
PWSpecial Weather Statement
National Weather Service New York NY
1106 PM EDT Sat Aug 3 2019
CTZ009-NJZ004-006-104>106-NYZ070>073-078-176>179-040400-
Southern Fairfield-Hudson-Eastern Essex-Western Essex-Eastern
Bergen-Eastern Passaic-Northern Nassau-Northern Queens-Northwest
Suffolk-Southern Queens-Bronx-Southern Westchester-New York
(Manhattan)-Northern Westchester-Southern Nassau-
1106 PM EDT Sat Aug 3 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN FAIRFIELD...
HUDSON...SOUTHEASTERN BERGEN...CENTRAL ESSEX...SOUTHERN
WESTCHESTER...QUEENS...BRONX...WEST CENTRAL SUFFOLK...NEW YORK
(MANHATTAN) AND CENTRAL NASSAU COUNTIES...
At 1106 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Tarrytown to Bergenfield to Caldwell.
Movement was east at 30 mph.
Winds in excess of 30 mph are possible with these storms.
Locations impacted include...
Jamaica, Yonkers, Stamford, Norwalk, New Rochelle, Flushing, Passaic,
White Plains, Mott Haven, Hoboken, Bloomfield, East Tremont,
Hackensack, Commack and Huntington Station.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4080 7436 4091 7413 4089 7412 4102 7396
4100 7389 4112 7385 4111 7324 4100 7359
4088 7374 4086 7366 4092 7364 4097 7340
4092 7320 4098 7315 4097 7315 4081 7327
4078 7344 4076 7344 4067 7371
TIME...MOT...LOC 0306Z 276DEG 25KT 4106 7384 4093 7398 4086 7426
PWThe Brookhaven radar (KOKX), 105 km away, was scanning. The volume nearest the first event began at 03:07 UTC.
4 flash flood. Local standard time, as filed.
Multiple vehicles were stranded on Broadway under the railroad overpass at the Broadway Fair Lawn train station in Fair Lawn. Water was reported higher than the car windows. Police were conducting water rescues.
There were numerous reports of vehicles stranded due to high water on Route 208 in Fair Lawn including at Berdan Avenue, Morlot Avenue, and near the Maple Avenue Fire Company. Additional flooding was reported on Berdan Avenue with occupied vehicles stranded in high water, including at the intersection with Ruskin Avenue.
Numerous vehicles were stranded by high water on River Drive at Columbia Street in Elmwood Park. Additional flooding was also reported along Mola Boulevard.
The basement of a house on Orchard Street between Mola Boulevard and Spruce Street flooded with 3-4 feet of water in Elmwood Park.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Jersey in 2019Every state in 2019This day in weather historyWarnings in New Jersey, August 2019
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: 855150, 855151, 855152, 855153.