Updated 8:54 PM — Wednesday, May 20, 2026. A severe thunderstorm watch remains in effect for Nassau and Suffolk Counties through 9 PM, with damaging wind gusts up to 70 mph, large hail, and flash flooding possible. This hits just 36 hours after Long Island Rail Road service resumed following a multi-day strike. Cascading transit disruptions are active across the region.
LIRR: Back One Day, Already Under Pressure
Long Island commuters have barely caught their breath.
The Long Island Rail Road — the busiest commuter rail system in the United States — came back to life on Tuesday, May 19, 2026 at noon, when the first trains departed Penn Station and Grand Central Madison after a strike that shut down service beginning Saturday, May 16. The deal gave unions a 4.5% raise and a 6-week contract extension, ending days of chaos for roughly 300,000 daily riders.
Now, less than 36 hours after wheels turned again, those same riders face another round of disruption: a severe thunderstorm system that has already battered New York City — 60 mph winds, penny-sized hail, and flash flooding — is pushing east into Nassau and Suffolk Counties as of Wednesday evening.
The NWS Forecast Office for New York issued a severe thunderstorm watch for Long Island through 9 PM Wednesday, with meteorologists warning of wind gusts reaching 70-80 mph in the strongest cells. “Scattered power outages are likely with any storm in addition to ponding of water,” News 12 Long Island reported ahead of the evening.
What’s Happening Right Now: A Transit System Under Siege
Tonight’s commute home is being complicated by multiple simultaneous failures across the metro transit network:
NJ Transit: Suspended at Penn Station
At approximately 8:45 PM, NJ Transit suspended all rail service into and out of Penn Station New York due to a brush fire near the Hudson River tunnels — an incident almost certainly sparked by tonight’s lightning activity. Midtown Direct trains are being diverted to Hoboken Terminal.
Penn Station is shared infrastructure. When NJ Transit operations break down there, it creates platform cascades that delay LIRR trains as well. Long Island commuters at Penn Station should expect signal delays, platform holdouts, and reduced on-time performance even if their specific LIRR train is technically running.
Action: Check MTA LIRR service alerts for real-time status. If you need to reach New Jersey, PATH trains from 33rd Street or World Trade Center are running to Hoboken as an alternative.
LaGuardia Airport: Runway Still Closed
LaGuardia’s Runway 4/22 has been closed since 11:00 AM Wednesday after a sinkhole opened during routine inspection. The runway is not expected to reopen until Thursday morning, May 21. As of 2:30 PM, arriving flights were delayed an average of 1 hour and 37 minutes; with tonight’s storm compounding the runway reduction, delays and cancellations will intensify through the overnight.
Long Island travelers planning early Thursday departures from LGA should verify their flight status and allow significant extra time.
Storm Impact on LIRR: What to Watch
LIRR is most vulnerable to severe thunderstorms in several ways:
Downed trees on tracks — The suburban and rural sections of Long Island are lined with mature trees. A single downed tree can block the Ronkonkoma, Babylon, or Far Rockaway branches for hours. Tonight’s 60-70 mph gusts will test the post-strike crews’ ability to respond rapidly.
Flash flooding at grade crossings — The LIRR crosses dozens of at-grade road crossings and traverses areas prone to flooding in the Babylon and Hempstead branches. Standing water can trigger signal failures and require emergency slow-orders.
Power outages affecting signals — If PSEG Long Island loses circuits near switching infrastructure, automated signaling can go dark, requiring manual operation at reduced speeds. Power outage impacts on LIRR can outlast the outage itself as signal systems are methodically restored.
Track circuit issues — Rain infiltration into aging track circuits can create phantom occupancy readings, causing automated systems to halt trains. This is a chronic issue on sections of the LIRR that predate modern sealed infrastructure.
The Storm Itself: What Long Island Is Facing
The system pushing through tonight broke the region’s punishing heat wave — New York City had climbed above 90°F in the days leading up to this storm event. When a cold front collides with that kind of heat and humidity, the results are exactly what we’re seeing: explosive thunderstorm development with severe parameters.
The National Weather Service confirmed the primary threats through tonight:
- Wind gusts to 70-80 mph — at these speeds, tree failure becomes widespread; even healthy trees can go down
- Large hail — up to penny-size (¾ inch diameter), capable of damaging cars, windows, and crops
- Flash flooding — rapid precipitation rates overwhelming catch basins and combined sewer infrastructure
- Extremely frequent lightning — a specific threat to power infrastructure and anyone caught outdoors
- Isolated tornadoes — the severe parameters include tornadic potential, particularly ahead of the squall line
The system has already produced documented damage across NYC:
- A large tree branch fell on a car at Lee Avenue and Rutledge Street in Williamsburg, Brooklyn
- Bushwick streets turned to rivers at Wilson Avenue and Stockholm Street
- Flushing Avenue in Jamaica, Queens was underwater with pedestrians wading ankle-deep
- A dramatic shelf cloud was captured rolling over Long Island around 8:35 PM
- Staten Island reported 600+ ConEd customers without power in Arden Heights, with scattered outages across Mariners Harbor, West Brighton, and Oakwood Heights
The same system hit Lancaster County, Pennsylvania earlier in the day, where a tree split at its trunk and fell into a house in Manheim Township.
PSEG Long Island: Storm Impact Anticipated
Unlike ConEd, which serves New York City, PSEG Long Island operates the distribution infrastructure across Nassau and Suffolk Counties under a contract with LIPA (Long Island Power Authority). PSEG Long Island’s own reliability metrics have been a subject of controversy — the system’s outage frequency has worsened since 2021, and the average outage duration remains around 82 minutes even in non-storm conditions.
In a major storm like tonight’s — 60-70 mph wind gusts, large hail, lightning — distributed outages across Nassau and Suffolk should be expected. The communities most at risk include those with overhead distribution lines and older infrastructure in densely-treed neighborhoods like Garden City, Roslyn, Cold Spring Harbor, Huntington, Northport, and south shore communities along the Southern State Parkway corridor.
To report an outage or downed wire:
- PSEG Long Island: 1-800-490-0075 (24/7)
- Online outage map: psegliny.com/outages
- Downed wires: Stay away and call 911
Road Conditions Tonight
The combination of heavy rain, potential flooding, and downed debris creates dangerous road conditions. Long Island’s major corridors at elevated risk tonight:
Long Island Expressway (I-495): Low points near exit 40 (Hauppauge) and the Queens-Nassau border can pond quickly in heavy rain. Watch for debris in all lanes.
Southern State Parkway: The Sunrise Highway / Southern State corridor through Nassau has recurring flood spots at Route 106/107 and in sections through Hempstead. Low-riding vehicles can become stuck quickly.
Northern State Parkway: Tree canopy along Northern State means debris is a risk in 70 mph gusts. Drive with lights on and reduce speed.
Montauk Highway / Route 27: South Fork communities face additional surge risk during tonight’s storm — coastal flooding advisories may follow.
511NY is the official road conditions line for New York State. For real-time incidents: 511ny.org or call 511.
The Bigger Picture: A Rough Week for Long Island Transit
This week may go down as one of the most chaotic in recent memory for Long Island’s transportation infrastructure:
- May 16-19: LIRR strike disrupts 300,000 daily commuters for four days
- May 20, 11 AM: LaGuardia sinkhole closes Runway 4/22, 101+ flights canceled or delayed
- May 20, ~3 PM: School bus with 39 children trapped in Bronx sinkhole
- May 20, 6:28 PM: NWS issues Severe Thunderstorm Warning for NYC; storm moves east
- May 20, ~8:35 PM: Shelf cloud rolls over Long Island; storm crosses Nassau/Suffolk border
- May 20, ~8:45 PM: NJ Transit suspends service at Penn Station
- May 21 (early hours): Storm expected to continue through overnight hours
The LIRR was already running with crews still settling back into position after the strike — any post-strike restoration period is operationally fragile, with reduced buffer in maintenance scheduling and crew positioning. A severe storm in that window creates maximum risk for extended disruptions.
What to Do Tonight
If you’re commuting home on LIRR:
- Check new.mta.info/alerts every 15-20 minutes
- If possible, delay departure by 1-2 hours to let the storm front pass — most severe cells will clear by 9-10 PM
- If stranded at Penn Station, the NJ Transit/PATH area concourse and Moynihan Train Hall are dry waiting areas
If you’re driving on Long Island tonight:
- Reduce speed significantly in heavy rain — hydroplaning risk is high
- Turn around, don’t drown — as little as 6 inches of moving water can knock over a person; 12 inches can carry away a small vehicle
- Avoid roads known to flood and leave extra distance behind semi-trucks and buses
- Report downed wires or trees blocking roads to 911
For flight travelers:
- LaGuardia: Check airline app directly for status; expect delays and cancellations through Thursday morning
- JFK: Monitoring for storm delays; weather-related Ground Delay Programs possible
- Allow extra drive time for Queens airport approaches given NJ Transit diversions adding to Van Wyck / Belt Parkway traffic
Monitoring Resources
- MTA LIRR Alerts: new.mta.info/alerts
- PSEG Long Island Outage Map: psegliny.com/outages
- FAA LaGuardia Status: fly.faa.gov/LGA
- NWS New York: weather.gov/okx
- 511NY Road Conditions: 511ny.org or call 511
Long Island Traffic is monitoring tonight’s storm. This article will be updated as conditions develop.
Sources
- MTA.info: LIRR service resumes Tuesday, May 19
- Newsday: LIRR strike deal gives unions 4.5% raise
- Gothamist: LIRR strike ends as MTA reaches deal
- NewsX: NYC Weather Alert — Severe Thunderstorm Watch issued for New York City
- News 12 Long Island: Severe thunderstorm watch issued for Long Island until 9 p.m.
- SILive.com: Severe thunderstorm sweeps across Staten Island
- NBC New York: Sinkhole at LaGuardia Airport shuts down runway
- MTA.info: LIRR timetables — severe weather reduced schedule policy