An upper level trough approached from the west along with an associated surface cold front. The environment over the area ahead of the front was able to destabilize with MLCAPE values reaching about 2000 J/kg.
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.
An upper level trough approached from the west along with an associated surface cold front. The environment over the area ahead of the front was able to destabilize with MLCAPE values reaching about 2000 J/kg. This, combined with ample Effective Bulk Shear of about 45 kt, allowed severe thunderstorms to develop as the cold front moved through the area. These storms produced damaging wind gusts.
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 Sep 6, 1:02 PM EST, 1 hour 23 minutes earlier.
Area Forecast Discussion
National Weather Service New York NY
202 PM EDT Sat Sep 6 2025
.SYNOPSIS...
A cold front will impact the area today and pass offshore tonight.
High pressure builds in late Sunday and remains in control through
much of next week. A cold front approaches late next week, with
high pressure expected thereafter.
&&
.NEAR TERM /THROUGH TONIGHT/...
A cold front enters the forecast area this afternoon and moves east
through the area, pushing offshore late tonight.
Showers and thunderstorms becoming likely this afternoon into
evening across the area, weakening overnight as shower activity
continues mostly east of the city.
Shear and CAPE still look sufficient for the potential of severe
thunderstorms for NYC metro, NE NJ, and Lower Hudson valley into SW
CT. Main severe threat will be strong/damaging wind gusts, but
veering profiles with good speed shear could support organized cells
that maintain updrafts for large hail, and even an isolated tornado.
Other concern is flooding potential. PWATs increase to 1.75-2.00
inches right ahead of the cold front. The forward motion of storms
until around sundown will be a mitigating factor for flooding, but
the eastward motion of showers and remaining convection thereafter
should slow down. By this time, the collocation of the
convective potential (which will be diminishing) and the PWAT
axis will be east of the city, where FFG levels are harder to
reach. There seems to be a narrow window of time for flash
flooding opportunity in the more sensitive urbanized areas, and
will hold off of on what would be otherwise a very targeted
flash flood watch. But with that said, will need to keep and eye
on hi-res models to see if they continue to converge on
potential amounts and location of the qpf axis. Some HREF
members currently show localized 3-4 inch rain totals INVOF NYC
metro. HREF probs of 30% or greater for 3+ inches in 3 hours is
a pretty good indicator of flash flooding around here, but
values remain below 20% currently, and global models show lower
rain totals (which is usually the case) - under 2 inches
everywhere.
&&
.SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...
The cold front will be not too far offshore on Sunday as it
continues to slowly shift east. Upper divergence from the right rear
quadrant of a strong upper jet streak maintains the threat of
showers primarily east of the city, and mostly during the morning
hours. Diminishing clouds otherwise elsewhere. High pressure builds
in Sunday night and remains in control through Monday night with dry
and less conditions. NBM looked good for temps.
&&
.LONG TERM /TUESDAY THROUGH SATURDAY/...
Key Points:
*Mainly dry with below normal temperatures next week.
Followed the NBM with this update.
Heights build next week with another large high pressure system
building into the area and holding on for much of the week.
Temperatures will be on the order of 5 to 10 degrees below normal
during the period.
In addition, building heights aloft through midweek will allow the
western Atlantic subtrop ridge to build closer to the east coast.
This will allow the forecast area to be close to the NW periphery of
some offshore frontal wave activity. The NBM has trended higher with
PoPs for midweek and may be too aggressive. Have kept for now given
its maxing out at low end chance (30-40%). This may end up trending
back down in future updates.
A late week cold front will bring another shot of cooler air for
next weekend with Canadian high pressure building in behind it.
Widespread low to mid 40s currently forecast for next Friday night
and Saturday night across the interior.
&&
.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
A cold front gradually moves through the area this afternoon
through Sunday morning. High pressure builds in Sunday night.
VFR conditions across all terminals as of 18Z. However, a line
of showers and thunderstorms across Lower Hudson Valley and
northeast NJ is slowly pushing east and will affect the KEWR and
KTEB around 19Z (perhaps a bit sooner than currently is
forecast). This line will then continue to move east through
the afternoon and affect the other NYC terminals towards 19Z to
around 20Z. IFR to MVFR conditions are possible in any
showers/thunderstorms. The line is expected to weaken as it
pushes east, so as it reaches KGON, thunder is no longer
expected, with wind gusts associated with any thunderstorms
diminishing. After about 00Z lingering the threat for thunder
diminishes, but an isolated thunderstorm is still possible
through 01-02Z is expected through Saturday night with MVFR vsby
and cigs.
Southerly flow continues today at 10 kt to 15 kt, with gusts 20
to 30 kt. As the front approaches later in the day and early
evening look for a wind shift, especially in any thunderstorms
to the NW. Additionally, gusts of 30 to 40 kt (or higher if
storms become severe - generally across NE NJ and Lower Hudson
Valley) are possible with any thunderstorms and added gusts of
30 to 35 kt within the TEMPO groups for the +TSRA. Otherwise,
with the boundary settling nearby the winds likely go variable
in direction late in the TAF period for the city terminals this
evening.
...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty...
There remains some uncertainty with the timing of the arrival
of showers and thunderstorms this afternoon with amendments
becoming increasingly likely late in the day and into the
evening.
Gusts of 30 to 40 kt are possible with any of the stronger
thunderstorms today. If storms become severe gusts around 50 kt
are possible. Higher chances for severe are with KEWR and KTEB.
Start time of wind gusts may be off an hour or two.
.OUTLOOK FOR 00Z MONDAY THROUGH THURSDAY...
Sunday night: VFR.
Monday and Tuesday: VFR.
Wednesday: Potential for MVFR in -SHRA.
Thursday: VFR.
Detailed information, including hourly TAF wind component forecasts,
can be found at: https:/www.weather.gov/zny/n90
&&
.MARINE...
SCA remains posted for the ocean waters with seas up to 5 ft and
gusts up to around 25 kt. Occasional gusts to 25 kt possible this
afternoon/early evening elsewhere, but not enough for an advisory.
Lighter offshore winds for Sunday will promote sub-advisory
conditions on all waters. Sub-advisory conds then continue
through Monday night.
Easterly winds will strengthen on Tuesday due to a tightening
pressure gradient across the waters. E winds could gusts up to 20 kt
on the ocean waters with seas building to around 4 ft. There is a
chance that an E swell could help seas increase to around 5 ft on
Wednesday.
&&
.HYDROLOGY...
A fairly wide range of rainfall totals is expected for this
afternoon through tonight. Anticipating mostly 1-2 inches of rain
with locally higher amounts. Lower amounts are expected for eastern
LI and SE CT and perhaps the far NW zones. Areas of minor urban and
poor drainage flooding can be expected. There is a localized flash
flood risk as well, with overall best chances (15% chance) for the
urban corridor of NE NJ into NYC metro and northward into Fairfield
County. A 5% chance of flash flooding exists elsewhere. Timing for
the highest chances of flooding is from mid-afternoon to early
evening.
&&
.TIDES/COASTAL FLOODING...
There is a high rip current risk through this evening due to a
combination of a strong onshore flow (S 15-20kt) and southerly wind
waves of 4-5ft 7S. For Sunday, the risk at the very least will be
moderate, and possibly high with a southerly swell of around 3ft 7S.
However, winds will be less of a factor due to being offshore and
generally less than 10 kt.
&&
.OKX WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...High Risk for Rip Currents until 8 PM EDT this evening for NYZ075-
080-081-178-179.
NJ...None.
MARINE...Small Craft Advisory until 6 PM EDT this evening for ANZ350-
353-355.
&&
SYNOPSIS...
NEAR TERM...
SHORT TERM...
LONG TERM...
AVIATION...JP
MARINE...
HYDROLOGY...
TIDES/COASTAL FLOODING...Hazardous Weather Outlook National Weather Service New York NY 141 PM EDT Sat Sep 6 2025 CTZ005-006-009-NJZ002-004-006-103>108-NYZ067>074-176-177-071745- Northern Fairfield-Northern New Haven-Southern Fairfield- Western Passaic-Eastern Passaic-Hudson-Western Bergen-Eastern Bergen- Western Essex-Eastern Essex-Western Union-Eastern Union-Orange- Putnam-Rockland-Northern Westchester-Southern Westchester- New York (Manhattan)-Bronx-Richmond (Staten Island)-Northern Queens- Northern Nassau- 141 PM EDT Sat Sep 6 2025 ...SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for southern Connecticut, northeast New Jersey and southeast New York. .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. In addition, heavy rain will likely produce areas of urban and poor drainage flooding, along with a localized flash flood risk. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Hazardous weather is not 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. && 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. NYZ075-178-179-071745- Kings (Brooklyn)-Southern Queens-Southern Nassau- 141 PM EDT Sat Sep 6 2025 ...HIGH RIP CURRENT RISK IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for southeast New York. .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. High Rip Current Risk. Severe Thunderstorm Watch. In addition, heavy rain will likely produce areas of urban and poor drainage flooding, along with a localized flash flood risk. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Hazardous weather is not 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. && 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. ANZ335-338-071745- Long Island Sound West of New Haven CT/Port Jefferson NY- New York Harbor- 141 PM EDT Sat Sep 6 2025 ...SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for Atlantic coastal waters. .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...Sunday through Friday. Hazardous weather is not 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. && 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. CTZ007-010-011-071745- Northern Middlesex-Southern New Haven-Southern Middlesex- 141 PM EDT Sat Sep 6 2025 ...SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for southern Connecticut. .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. In addition, heavy rain will likely produce areas of urban and poor drainage flooding, along with a localized flash flood risk. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Hazardous weather is not 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. && 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. ANZ331-332-340-345-350-353-355-CTZ008-012-NYZ078-079-071745- Long Island Sound East of New Haven CT/Port Jefferson NY to the Mouth of the Connecticut River- Long Island Sound East of the Mouth of the Connecticut River- 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-Northern New London- Southern New London-Northwest Suffolk-Northeast Suffolk- 141 PM EDT Sat Sep 6 2025 This Hazardous Weather Outlook is for Atlantic coastal waters, southern Connecticut and southeast New York. .DAY ONE...This afternoon and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday. No hazardous weather is expected at this time that would meet NWS warning criteria. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && 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. NYZ080-081-071745- Southwest Suffolk-Southeast Suffolk- 141 PM EDT Sat Sep 6 2025 ...HIGH RIP CURRENT RISK IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for southeast New York. .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. High Rip Current Risk. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Hazardous weather is not expected at this time that would meet NWS warning criteria. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && 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
224 PM EDT Sat Sep 6 2025
NYZ068>070-061915-
Putnam NY-Rockland NY-Northern Westchester NY-
224 PM EDT Sat Sep 6 2025
...A STRONG THUNDERSTORM WILL IMPACT NORTHERN WESTCHESTER...CENTRAL
PUTNAM AND ROCKLAND COUNTIES THROUGH 315 PM EDT...
At 223 PM EDT, Doppler radar was tracking a strong thunderstorm over
Monsey, moving northeast at 35 mph.
HAZARD...Wind gusts up to 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
New City, Peekskill, Monsey, Haverstraw, Mahopac, Lake Carmel,
Brewster, Carmel, Pomona, Yorktown Heights, Spring Valley, Stony
Point, Jefferson Valley, Putnam Valley, and West Haverstraw.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northeastern New Jersey...and southeastern New York.
&&
LAT...LON 4133 7356 4107 7407 4117 7418 4152 7366
4152 7361
TIME...MOT...LOC 1823Z 235DEG 33KT 4115 7408
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
DWSpecial Weather Statement
National Weather Service New York NY
227 PM EDT Sat Sep 6 2025
CTZ005-061845-
Northern Fairfield CT-
227 PM EDT Sat Sep 6 2025
...A STRONG THUNDERSTORM WILL IMPACT THROUGH 245 PM EDT...
At 227 PM EDT, Doppler radar was tracking a strong thunderstorm over
Wingdale, or near Sherman, moving northeast at 40 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Sherman.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern Connecticut.
&&
LAT...LON 4166 7350 4166 7349 4165 7349 4164 7350
4157 7347 4154 7353 4167 7352
TIME...MOT...LOC 1827Z 235DEG 33KT 4167 7353
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
DWSpecial Weather Statement
National Weather Service New York NY
232 PM EDT Sat Sep 6 2025
NJZ006-104>108-NYZ071>073-176-177-061915-
Hudson NJ-Eastern Union NJ-Eastern Essex NJ-Western Union NJ-
Western Essex NJ-Eastern Bergen NJ-Northern Queens NY-
Southern Westchester NY-Bronx NY-New York (Manhattan) NY-
Northern Nassau NY-
232 PM EDT Sat Sep 6 2025
...A STRONG THUNDERSTORM WILL IMPACT HUDSON...EASTERN UNION...
SOUTHEASTERN BERGEN...SOUTHEASTERN ESSEX...SOUTHERN WESTCHESTER...
QUEENS...BRONX...NEW YORK (MANHATTAN) AND NORTHWESTERN NASSAU
COUNTIES THROUGH 315 PM EDT...
At 231 PM EDT, Doppler radar was tracking a strong thunderstorm over
Kearny, or over Harrison, moving northeast at 35 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
This strong thunderstorm will be near...
Jersey City and Hoboken around 235 PM EDT.
Ridgefield and Midtown Manhattan around 240 PM EDT.
Mott Haven and RFK Bridge around 245 PM EDT.
East Tremont and Laguardia Airport around 250 PM EDT.
Co-op City around 255 PM EDT.
Throgs Neck Bridge and City Island around 300 PM EDT.
New Rochelle around 305 PM EDT.
Sands Point around 310 PM EDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 8 PM.
&&
LAT...LON 4071 7432 4082 7413 4083 7412 4108 7371
4100 7364 4094 7367 4088 7374 4086 7366
4092 7364 4092 7358 4085 7352 4072 7392
4074 7395 4071 7397 4070 7400 4070 7401
4064 7416 4065 7419 4063 7420 4060 7429
TIME...MOT...LOC 1831Z 236DEG 29KT 4072 7411
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
GoodmanSpecial Weather Statement
National Weather Service New York NY
254 PM EDT Sat Sep 6 2025
CTZ005-006-NYZ070-061945-
Northern Fairfield CT-Northern New Haven CT-Northern Westchester NY-
254 PM EDT Sat Sep 6 2025
...A STRONG THUNDERSTORM WILL IMPACT CENTRAL FAIRFIELD...NORTHWESTERN
NEW HAVEN AND NORTHERN WESTCHESTER COUNTIES THROUGH 345 PM EDT...
At 253 PM EDT, Doppler radar was tracking a strong thunderstorm near
Bedford, or near Mount Kisco, moving northeast at 40 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
Locations impacted include...
Waterbury, Danbury, Shelton, Naugatuck, Southbury, Newtown, Hamden,
Ridgefield, Monroe, Bethel, Wilton, Seymour, Brookfield, Derby, and
Prospect.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern Connecticut...and southeastern New York.
&&
LAT...LON 4141 7290 4119 7366 4130 7376 4136 7363
4137 7355 4140 7354 4149 7336 4147 7331
4149 7333 4151 7332 4151 7316 4156 7317
4157 7309 4159 7308 4159 7306 4160 7306
TIME...MOT...LOC 1853Z 243DEG 37KT 4126 7366
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
DWPreliminary Local Storm Report
National Weather Service New York NY
316 PM EDT Sat Sep 6 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0310 PM Tstm Wnd Dmg 1 NW Harlem 40.83N 73.95W
09/06/2025 New York (ManhattanNY Fire Dept/Rescue
Tree down on the Henry Hudson Parkway.
&&The Brookhaven radar (KOKX), 68 km away, was scanning. The volume nearest the first event began at 19:25 UTC.
2 thunderstorm wind. Local standard time, as filed.
Eversource reports a power outage due to tree damage on Mill Hill Road S.
Eversource reports a power outage caused by tree damage on Val Court in Wolcott.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Connecticut in 2025Every state in 2025This day in weather historyWarnings in Connecticut, September 2025
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: 1294897, 1294898.