Between Friday, Sept. 25 and Sunday, Sept. 27, 2026, a nor’easter brought coastal flooding, damaging winds and heavy rain across Nassau and Suffolk counties. According to the National Weather Service New York/Upton, a Coastal Flood Warning was first issued at 5:27 a.m. Friday, Sept. 25, and a High Wind Warning followed at 1:47 p.m. Saturday, Sept. 26; the last scheduled warning end was 6:00 p.m. Sunday, Sept. 27.
The storm produced 16 tide gauges at or above minor flood stage, 25,172 customers without power at the recorded peak, 54 NWS Local Storm Reports, and 40 storm-type road records logged by 511NY — according to NOAA National Water Prediction Service tide gauges, the PSEG Long Island outage map, NWS New York/Upton Local Storm Reports, and the 511NY event feed as recorded by Long Island Traffic. Follow the latest conditions on our live storm page.
Tide gauges reached flood stage at 16 locations, one in the major category
The NOAA National Water Prediction Service tide gauges, as recorded by Long Island Traffic, showed 16 Long Island gauges at or above NWS minor flood stage during the storm window. Of those, 8 reached moderate flood stage or higher, and 1 — Hudson Bay at Freeport — reached the major category, with a recorded peak of 7.38 ft MLLW at 9:30 a.m. Sunday, Sept. 27; major stage at that gauge is 7.2 ft.
Seven gauges reached the moderate category. Among them, Hog Island Channel at Island Park peaked at 7.90 ft MLLW at 9:55 a.m. Sunday, and Great South Bay at Lindenhurst reached 4.08 ft MLLW at 11:00 a.m. Sunday. Eight gauges remained in the minor category, including Jamaica Bay at Inwood, which recorded 8.43 ft MLLW at 9:48 a.m. Sunday, and Moriches Bay at Moriches Bay, which recorded 4.46 ft MLLW at 9:48 a.m. Sunday. LIT first stored gauge readings for this event at 9:48 p.m. Saturday, Sept. 26.
Highest reading LIT recorded at each Long Island gauge at or above minor flood stage
| Gauge | Peak (ft MLLW) | NWS category | Time (ET) | Minor / moderate / major stage (ft) |
|---|---|---|---|---|
| Hudson Bay at Freeport | 7.38 | major | Sun 9/27 9:30 a.m. | 6 / 6.5 / 7.2 |
| Little Neck Bay at Kings Point | 10.91 | moderate | Sun 9/27 11:54 a.m. | 10 / 10.5 / 13 |
| Flax Pond at Old Field | 10.20 | moderate | Sun 9/27 12:43 a.m. | 9.2 / 10.2 / 12.2 |
| Hog Island Channel at Island Park | 7.90 | moderate | Sun 9/27 9:55 a.m. | 6 / 7 / 8 |
| East Rockaway Inlet at Atlantic Beach | 7.63 | moderate | Sun 9/27 9:00 a.m. | 6.2 / 7.2 / 8.2 |
| Reynolds Channel at Point Lookout | 7.20 | moderate | Sun 9/27 8:48 a.m. | 6 / 7 / 8 |
| Peconic River at Riverhead | 6.42 | moderate | Sun 9/27 12:54 a.m. | 5.7 / 6.4 / 7.2 |
| Great South Bay at Lindenhurst | 4.08 | moderate | Sun 9/27 11:00 a.m. | 3.1 / 3.6 / 4.1 |
| Long Island Sound at Sands Point | 10.93 | minor | Sun 9/27 11:50 a.m. | 10 / 11 / 12 |
| Long Island Sound above Lattingtown | 10.43 | minor | Sun 9/27 11:49 a.m. | 10.1 / 11.1 / 13.1 |
| Jamaica Bay at Inwood | 8.43 | minor | Sun 9/27 9:48 a.m. | 7.8 / 8.5 / 9.3 |
| Shinnecock Bay at Ponquogue | 5.84 | minor | Sun 9/27 8:48 a.m. | 4.9 / 5.9 / 6.9 |
| Orient Harbor at Orient | 5.30 | minor | Sun 9/27 10:54 a.m. | 4.8 / 5.8 / 6.8 |
| Fort Pond Bay at Montauk | 4.76 | minor | Sun 9/27 10:06 a.m. | 4.1 / 4.9 / 6.6 |
| Moriches Bay at Moriches Bay | 4.46 | minor | Sun 9/27 9:48 a.m. | 4.3 / 5.3 / 6.3 |
| Great South Bay at Watch Hill | 3.43 | minor | Sun 9/27 12:00 p.m. | 3.2 / 3.7 / 4.2 |
25,172 customers were without power at the recorded peak Sunday morning
The PSEG Long Island outage map, as recorded by Long Island Traffic across 64 snapshots, showed 25,172 customers without power at 8:51 a.m. Sunday, Sept. 27 — 2.17% of the 1,159,043 customers PSEG Long Island serves. Suffolk County accounted for 20,155 of those customers and Nassau County for 5,010 at that same reading, according to the PSEG Long Island outage map.
At the town level, Brookhaven in Suffolk led all towns with 8,252 customers without power at 4:21 a.m. Sunday — 4.23% of its customers — according to the PSEG Long Island outage map. Huntington recorded 5,518 customers without power (6.88%) at 6:21 a.m. Sunday, and Smithtown reached 4,851 customers without power (10.51%) at 2:41 p.m. Sunday.
Highest customers-out count LIT recorded in each town
| Town | County | Customers out | Share of town customers (%) | Time (ET) |
|---|---|---|---|---|
| Brookhaven | Suffolk | 8,252 | 4.23 | Sun 9/27 4:21 a.m. |
| Huntington | Suffolk | 5,518 | 6.88 | Sun 9/27 6:21 a.m. |
| Smithtown | Suffolk | 4,851 | 10.51 | Sun 9/27 2:41 p.m. |
| Babylon | Suffolk | 3,546 | 4.13 | Sun 9/27 8:51 a.m. |
| Hempstead | Nassau | 2,318 | 0.88 | Sun 9/27 8:51 a.m. |
| East Hampton | Suffolk | 1,967 | 7.73 | Sun 9/27 8:11 a.m. |
| Oyster Bay | Nassau | 1,881 | 1.51 | Sun 9/27 7:52 a.m. |
| Southampton | Suffolk | 1,760 | 3.58 | Sun 9/27 1:51 p.m. |
| North Hempstead | Nassau | 1,622 | 1.76 | Sun 9/27 7:52 a.m. |
| Islip | Suffolk | 1,410 | 1.17 | Sun 9/27 8:51 a.m. |
The restoration curve, as recorded by Long Island Traffic from the PSEG Long Island outage map, showed 14,165 customers without power six hours after the recorded peak, 7,613 customers at twelve hours, and 6,104 customers at twenty-four hours. The first LIT snapshot with fewer than 1,000 customers out came at 7:51 p.m. Monday, Sept. 28, when 877 customers were without power — 35 hours after the recorded peak.
Customers without power after the recorded peak (nearest LIT snapshot)
| Point | Snapshot (ET) | Customers out |
|---|---|---|
| At recorded peak | Sun 9/27 8:51 a.m. | 25,172 |
| 6 hours later | Sun 9/27 3:50 p.m. | 14,165 |
| 12 hours later | Sun 9/27 9:51 p.m. | 7,613 |
| 24 hours later | Mon 9/28 9:01 a.m. | 6,104 |
| Latest LIT snapshot | Mon 9/28 7:51 p.m. | 877 |
Wind gusts reached 81 mph at Montauk Point, NWS reported
The National Weather Service New York/Upton Public Information Statement on highest wind reports, issued at 9:55 a.m. Sunday, Sept. 27, listed Montauk Point in Suffolk County as the top gust site at 81 mph, recorded at 4:00 a.m. Saturday, Sept. 26, via Mesonet. Stony Brook in Suffolk recorded 71 mph at 4:08 a.m. Sunday via CWOP, and Eatons Neck in Suffolk reached 67 mph at 6:38 a.m. Sunday via WXFLOW, according to the same NWS statement.
In Nassau County, Bayville led with 54 mph at 7:01 a.m. Sunday via WXFLOW, followed by Wantagh at 52 mph at 4:25 a.m. Saturday via NYSM, according to the NWS statement.
Highest wind gusts by county, top 5 each (NWS statement)
| County | Location | Gust (mph) | Time (ET) | Network |
|---|---|---|---|---|
| Suffolk | Montauk Point | 81 | Sat 9/26 4:00 a.m. | Mesonet |
| Suffolk | Stony Brook | 71 | Sun 9/27 4:08 a.m. | CWOP |
| Suffolk | Eatons Neck | 67 | Sun 9/27 6:38 a.m. | WXFLOW |
| Suffolk | Baiting Hollow | 62 | Sun 9/27 2:05 a.m. | CWOP |
| Suffolk | Farmingdale Airport | 61 | Sat 9/26 4:24 a.m. | ASOS |
| Nassau | Bayville | 54 | Sun 9/27 7:01 a.m. | WXFLOW |
| Nassau | Wantagh | 52 | Sat 9/26 4:25 a.m. | NYSM |
| Nassau | Syosset | 45 | Sun 9/27 1:59 a.m. | CWOP |
| Nassau | 0.8 NW Uniondale | 43 | Fri 9/25 8:50 p.m. | MESOWEST |
| Nassau | Valley Stream | 43 | Sun 9/27 5:51 a.m. | CWOP |
NWS Local Storm Reports also recorded measured wind gusts: 65 mph at 1 E Stony Brook (Mesonet station EW5678 Stony Brook) at 5:29 p.m. Saturday, Sept. 26, and 59 mph at 4 ENE Plum Island (Mesonet station XGUL Great Gull Island) at 6:48 p.m. Saturday, and 58 mph at Eatons Neck (Mesonet station XEAT Eatons Neck) at 6:23 p.m. Saturday, according to NWS New York/Upton Local Storm Reports.
Rainfall topped 6 inches in parts of Suffolk, NWS found
The National Weather Service New York/Upton Public Information Statement on rainfall — headed “RAINFALL REPORTS FROM NOREASTER” and issued at 1:34 p.m. Monday, Sept. 28 — reported that 1 E Dix Hills in Suffolk County received 6.60 inches, the highest total the statement lists for Nassau and Suffolk. Nearby, 1 S Commack recorded 6.59 inches and 1 N West Hills recorded 6.46 inches. The NWS Office at Upton recorded 6.20 inches via official NWS observation, according to the same statement.
In Nassau County, 1 E East Norwich led with 5.74 inches, followed by 1 N Syosset at 4.80 inches and 1 E Jericho at 4.26 inches, according to the NWS rainfall statement.
Highest rainfall totals by county, top 5 each (NWS statement)
| County | Location | Rain (in) | Reported (ET) | Network |
|---|---|---|---|---|
| Suffolk | 1 E Dix Hills | 6.60 | Mon 9/28 11:30 a.m. | CWOP |
| Suffolk | 1 S Commack | 6.59 | Mon 9/28 11:33 a.m. | CWOP |
| Suffolk | 1 N West Hills | 6.46 | Mon 9/28 11:35 a.m. | CWOP |
| Suffolk | 1 NW East Moriches | 6.40 | Mon 9/28 11:30 a.m. | CWOP |
| Suffolk | Upton (NWS Office) | 6.20 | Mon 9/28 8:00 a.m. | Official NWS Observation |
| Nassau | 1 E East Norwich | 5.74 | Mon 9/28 11:35 a.m. | CWOP |
| Nassau | 1 N Syosset | 4.80 | Mon 9/28 11:30 a.m. | CWOP |
| Nassau | 1 E Jericho | 4.26 | Mon 9/28 11:30 a.m. | CWOP |
| Nassau | 1 S East Rockaway | 4.22 | Mon 9/28 11:27 a.m. | CWOP |
| Nassau | Port Washington | 4.04 | Mon 9/28 11:30 a.m. | CWOP |
Long Beach Branch suspended 36.9 hours; three other branches saw weather alerts
Four weather-related LIRR alert threads were recorded by Long Island Traffic from the MTA Long Island Rail Road service alert feed. Two involved branch suspensions. The Long Beach Branch was suspended between Valley Stream and Long Beach due to flooding near Island Park; LIT first recorded the suspension at 8:57 a.m. Saturday, Sept. 26, and resumption was first seen at 9:53 p.m. Sunday, Sept. 27 — a suspension of 36.9 hours. The Port Jefferson Branch saw a suspension at 8:27 a.m. Saturday due to a downed tree on the tracks east of Kings Park; resumption was first seen at 9:28 a.m. Saturday, a suspension of 1 hour.
On the Ronkonkoma Branch, the 4:28 a.m. train from Ronkonkoma to Greenport was reported delayed at Mattituck due to weather-related signal trouble, first seen at 6:22 a.m. Sunday, Sept. 27. On the Oyster Bay Branch, the 10:37 a.m. train from Oyster Bay to Jamaica was delayed near Greenvale due to a downed tree on the tracks, first seen at 11:23 a.m. Sunday, according to Long Island Traffic’s records of the MTA LIRR alert feed. Check the LIRR status page for current conditions.
Weather-related LIRR alerts (flooding, trees, wind, weather)
| Branch | First MTA alert text LIT recorded | First seen (ET) | Suspension first seen (ET) | Resumption first seen (ET) | Suspension, hours |
|---|---|---|---|---|---|
| Port Jefferson | There are delays along the Port Jefferson Branch due to a downed tree on the tracks east of Kings Park. | Sat 9/26 7:57 a.m. | Sat 9/26 8:27 a.m. | Sat 9/26 9:28 a.m. | 1 |
| Long Beach | Long Beach Branch service is suspended between Valley Stream and Long Beach due to flooding near Island Park. | Sat 9/26 8:57 a.m. | Sat 9/26 8:57 a.m. | Sun 9/27 9:53 p.m. | 36.9 |
| Ronkonkoma | The 4:28am train from Ronkonkoma to Greenport is being delayed at Mattituck due to weather-related signal trouble. | Sun 9/27 6:22 a.m. | — | — | — |
| Oyster Bay | The 10:37am train from Oyster Bay to Jamaica is being delayed near Greenvale due to a downed tree on the tracks. | Sun 9/27 11:23 a.m. | — | — | — |
511NY logged 40 storm road records; downed trees dominated
The 511NY event feed, as recorded by Long Island Traffic, contained 40 downed-tree, flooding and downed-wire records in Nassau and Suffolk during the storm window — 19 in Nassau and 21 in Suffolk. Of those 40 records, 20 involved all lanes closed or blocked. Downed-tree records were the largest category, with 17 in Nassau and 17 in Suffolk; 18 of those downed-tree records had all lanes closed or blocked, according to 511NY records stored by Long Island Traffic.
By 511 locality, Oyster Bay and Huntington each had 6 records, East Hampton had 5, and Brookville, Smithtown and Islip each had 3, according to 511NY records stored by Long Island Traffic.
511NY storm-type road records, Nassau and Suffolk
| Record type | Nassau | Suffolk | With all lanes closed or blocked |
|---|---|---|---|
| Downed tree | 17 | 17 | 18 |
| Downed wires or utility | 0 | 1 | 0 |
| Flooding | 2 | 3 | 2 |
511NY storm-type road records by town (511 locality)
| Town (511 locality) | Records |
|---|---|
| Oyster Bay | 6 |
| Huntington | 6 |
| East Hampton | 5 |
| Brookville | 3 |
| Smithtown | 3 |
| Islip | 3 |
| Hempstead | 2 |
| Southampton | 2 |
NWS Local Storm Reports documented road and street impacts beginning at 4:30 a.m. Saturday, Sept. 26, when a large tree limb was reported down on the northbound side of William Floyd Parkway on the edge of the right lane near Yaphank, according to NWS New York/Upton Local Storm Reports. Coastal flooding reports included around 2 feet of inundation on W Park Avenue in Long Beach at 9:30 a.m. Saturday and at least 2 feet of inundation from Wyona Avenue to East Shore Road near Lindenhurst at the same time, also according to NWS Local Storm Reports. On the same morning, Waterview Drive in Southold was reported barricaded off due to flooding at 10:38 a.m. Saturday, and 2 ft of water inundation was reported at Jennings Road in Southampton at 10:48 a.m. Saturday, according to the same source.
NWS Local Storm Reports by type and county
| Report type | Nassau | Suffolk | Total |
|---|---|---|---|
| Wind damage | 3 | 30 | 33 |
| Coastal flooding | 6 | 12 | 18 |
| Measured wind gust | 0 | 3 | 3 |
NWS storm reports that describe a road, street or flooding depth (first 22 of 37 in time order)
| Time (ET) | Type | Location (NWS) | County | NWS remarks |
|---|---|---|---|---|
| Sat 9/26 4:30 a.m. | Wind damage | 2 NE Yaphank | Suffolk | A large tree limb down on northbound side of William Floyd Parkway on edge of right lane. |
| Sat 9/26 6:00 a.m. | Wind damage | 1 NNE Shirley | Suffolk | Large highway sign down on William Floyd Parkway near Sunrise Highway. |
| Sat 9/26 7:00 a.m. | Wind damage | 1 SE Commack | Suffolk | Downed tree near Fernwood Drive in Commack. |
| Sat 9/26 7:30 a.m. | Wind damage | 1 N Uniondale | Nassau | Large branch down and blocked part of the road at the intersection of McKenna Place and Manor Parkway. |
| Sat 9/26 7:30 a.m. | Wind damage | 1 SW East Moriches | Suffolk | Downed trees blocking Paquatuck Avenue in East Moriches and in front of East Moriches Ambulance company on Montauk Highway. |
| Sat 9/26 8:00 a.m. | Wind damage | Central Islip | Suffolk | A downed tree blocked Sprucewood Boulevard in Central Islip. |
| Sat 9/26 8:30 a.m. | Wind damage | Glen Head | Nassau | Large tree snapped with multiple branches down on left side of road. |
| Sat 9/26 8:30 a.m. | Wind damage | 1 N Melville | Suffolk | Large tree down on Walt Whitman Road in Melville just north of the service road. |
| Sat 9/26 9:00 a.m. | Wind damage | 1 W Lake Grove | Suffolk | Downed tree reported on Alexander Avenue. |
| Sat 9/26 9:30 a.m. | Coastal flooding | 1 W Long Beach | Nassau | Around 2 feet of inundation for a long stretch of W Park Avenue in Long Beach. |
| Sat 9/26 9:30 a.m. | Wind damage | 1 N Stony Brook | Suffolk | Tree down on the shoulder of Route 25A in Stony Brook near Thompson Hay Path. |
| Sat 9/26 9:30 a.m. | Coastal flooding | 1 SE Lindenhurst | Suffolk | Coastal flooding with at least 2 feet of inundation from Wyona Avenue to East Shore Road. |
| Sat 9/26 9:30 a.m. | Coastal flooding | 2 ESE Orient | Suffolk | Inundation of State Parkway at Orient State Park. |
| Sat 9/26 9:30 a.m. | Wind damage | 1 E Nesconset | Suffolk | Downed tree on road on Commander Vic Lane. |
| Sat 9/26 9:30 a.m. | Wind damage | 1 WSW Nissequogue | Suffolk | Downed tree at Triple Oak Drive and Long Beach Road in Saint James. |
| Sat 9/26 9:30 a.m. | Wind damage | 1 ESE Head of the Harbo | Suffolk | Downed tree on Great Oak Road in Saint James. |
| Sat 9/26 9:45 a.m. | Wind damage | 1 NW Setauket-East Seta | Suffolk | Tree on wires with snapped telephone poles near post office on Main Street in East Setauket. |
| Sat 9/26 10:03 a.m. | Wind damage | Port Jefferson | Suffolk | Multiple trees down at Oakwood Road and Pilgrim Drive. |
| Sat 9/26 10:38 a.m. | Coastal flooding | 1 S Southold | Suffolk | Waterview Drive in Southold barricaded off by the Highway Department due to flooding. |
| Sat 9/26 10:48 a.m. | Coastal flooding | 1 SSW North Sea | Suffolk | Water inundation of 2 ft at Jennings Road in Southampton. |
| Sat 9/26 11:30 a.m. | Coastal flooding | 1 W Port Jefferson | Suffolk | Flooding onto roadway at and near intersection of West Broadway and Main Street. |
| Sat 9/26 12:30 p.m. | Wind damage | 1 ENE Southold | Suffolk | Tree falls on home on Hippodrome Drive. |
How we measured this
- Window: from 12 hours before the first NWS warning for Nassau or Suffolk (issued Fri 9/25 5:27 a.m. ET) through 6 hours after the last warning’s scheduled end (Sun 9/27 6:00 p.m. ET). Power and rail recovery are followed to the latest LIT record.
- Power: LIT stores a PSEG Long Island outage-map summary about every 30 to 60 minutes. The peak is the largest customers-out total among those snapshots; town peaks are the largest count seen for each town in any snapshot, so town peaks can come from different times.
- Storm reports: NWS Local Storm Reports for Nassau and Suffolk with event times inside the window. When NWS issued a correction (“Corrects previous … report”), only the corrected report is counted; a report repeated in several NWS products is counted once.
- Rail: LIT polls the MTA LIRR alert feed and groups updates of the same MTA alert. “First seen” is when LIT first recorded an alert text, not necessarily when MTA posted it; a suspension’s length is measured between the first record saying “suspended” and the first later record saying service resumed.
- Roads: 511NY records whose description begins “Downed tree”, “Flooding” or “Downed utility/power/wire”, in Nassau and Suffolk, reported inside the window. One blocked road can produce more than one 511 record, so these are record counts, not a count of distinct blockages.
Limitations
- LIT began storing gauge readings for this event at Sat 9/26 9:48 p.m. ET; higher water before then (reported by NWS in its storm reports) is not in the gauge table.
- Local Storm Reports record what spotters, officials, media and the public reported to NWS. They are not a complete census of damage or flooding.
- Wind and rain figures are the NWS statements’ own station reports, including volunteer and private weather networks; they are point readings, not area averages.
- This page reports what the listed agencies published and what LIT’s monitors stored; it does not include damage assessments, insurance figures or municipal closure lists.
Sources
- National Weather Service New York/Upton alerts
- NOAA National Water Prediction Service tide gauges
- PSEG Long Island outage map
- NWS New York/Upton Local Storm Reports
- NWS New York/Upton Public Information Statement — highest wind reports
- NWS New York/Upton Public Information Statement — rainfall reports
- MTA Long Island Rail Road (LIRR) service alert feed, as recorded by Long Island Traffic
- 511NY event feed (NYSDOT), as recorded by Long Island Traffic