⚠️ ACTIVE WEATHER ALERT — May 20, 2026. The National Weather Service has issued a Severe Thunderstorm Warning for Brooklyn, Manhattan, and Staten Island until 7:00 PM EDT. 60 mph winds and penny-sized hail expected. Storms are pushing eastward toward Queens, Nassau County, and Suffolk County.
Current Warning

NYCEM — Notify NYC issued the alert at approximately 6:28 PM EDT:
@NWSNewYork Severe Thunderstorm Warning for Brooklyn, Manhattan, Staten Island: Until 7:00 PM on 5/20. 60mph winds & penny-sized hail expected.
What to Expect
- Wind gusts up to 60 mph — strong enough to down tree limbs, blow unsecured objects, and create dangerous driving conditions on exposed highways
- Penny-sized hail — minor vehicle damage possible; pedestrians should seek shelter
- Heavy rainfall — localized flash flooding likely, particularly in low-lying areas and near storm drains
- Lightning — frequent cloud-to-ground strikes expected with this cell
Long Island Impact
As of 8:15 PM, the storm cell is moving eastward from NYC into western Nassau County. Long Island commuters should expect:
- Road flooding on low-lying routes including Hempstead Turnpike, Sunrise Highway (western sections), Merrick Road, and underpasses throughout Nassau County
- Power outages — PSEG Long Island typically sees scattered outages with 60+ mph wind events. Check PSEG Long Island outage map
- LIRR disruptions — Severe weather can trigger speed restrictions and service suspensions on exposed track sections. Check MTA LIRR alerts
- LaGuardia additional delays — The airport is already operating on one runway due to today’s sinkhole. Thunderstorms compound the problem — the FAA had already implemented a traffic management program causing 1h 37m average delays before the storms arrived
The Sinkhole Connection
This storm arrives at the worst possible time for New York’s infrastructure.
As our data analysis published earlier today detailed, the region has experienced four sinkholes in seven days — a statistical anomaly driven in part by 2.8 inches of rainfall in the first half of May (140% of the historical average).
Tonight’s severe thunderstorm will dump additional rainfall onto ground that is already saturated and has demonstrated subsurface instability in multiple locations:
- The LIE sinkhole in Melville (May 14) was caused by damage to a sewage project — additional water flow through that same corridor tonight increases the risk of further settlement
- The LaGuardia runway sits on 1930s fill that is already compromised — additional rainfall will test whatever temporary repairs were made today
- Any NYC street with an aging water main or sewer line underneath is at elevated risk when sudden heavy rainfall overwhelms already-stressed drainage systems
More rain on unstable ground = more sinkholes. Avoid driving over areas where you see standing water that wasn’t there before, unusual pavement depressions, or bubbling/flowing water near utility covers.
Safety Guidance
If You’re Driving on Long Island
- Reduce speed and increase following distance — hydroplaning risk is highest in the first 15 minutes of heavy rain when oil rises to the road surface
- Avoid flooded underpasses — turn around, don’t drown. Six inches of moving water can knock an adult off their feet; 12 inches can float a vehicle
- Pull over if visibility drops below 100 feet — turn on hazard lights and wait for the heaviest cell to pass
- Stay away from downed power lines — treat every downed line as live. Call 911 and PSEG Long Island at 1-800-490-0075
If You’re at Home
- Bring in unsecured outdoor items — patio furniture, trash cans, and anything that can become a projectile in 60 mph gusts
- Charge devices — power outages are likely
- Stay away from windows during the strongest gusts
- Monitor weather.gov/okx for updated warnings and watches
Timeline
| Time (EDT) | Event |
|---|---|
| 6:28 PM | NWS issues Severe Thunderstorm Warning for Brooklyn, Manhattan, Staten Island |
| ~7:00 PM | Warning expires for NYC; storms pushing into Queens and western Nassau |
| 7:00–9:00 PM | Storm cell expected to cross Nassau County into western Suffolk |
| Overnight | Residual showers, diminishing winds |
| Thursday AM | Clearing skies; assess damage and flooding |
Long Island Traffic will update this article as the storm progresses eastward.