# Northeastern US flash-flood and severe weather emergency > Live situation record from CLSTR: https://clstr.news/situations/northeastern-us-summer-weather-outlook > Updated: 2026-08-28T12:38:43.000Z. Sources: 69. Developments: 12. Severe storms and tornadoes continued to impact the Northeastern and Mid-Atlantic United States through late August. On August 19, heavy rainfall placed over 32 million people along the Interstate 95 corridor under flash flood threats. In Dover, Delaware, a tornado caused significant destruction, including damage to motels and a Kraft Foods facility. While the city declared a state of emergency, officials reported no serious injuries. In Nassau County, New York, a waterspout that transitioned into an EF-1 tornado touched down at Atlantic Beach, damaging the Sun and Surf Beach Club, beach cabanas, and shattering the windows of approximately 30 vehicles. Nassau County Executive Bruce Blakeman declared a state of emergency following the event. Flash flooding caused widespread disruption, including the closure of the Long Island Expressway in both directions in Queens and delays within the New York City subway system. In Jersey City, New Jersey, emergency crews rescued 69 people who were trapped in vehicles due to rising waters. Air travel also faced significant delays at JFK, LaGuardia, and Newark airports. Although the state of emergency in Dover was lifted on Friday, August 20, cleanup efforts remained ongoing due to debris and blocked lanes. On August 27, severe thunderstorms dumped more than five inches of rain across parts of New Jersey. In South Jersey counties, including Camden and Gloucester, rainfall totals reached between three and seven inches. The overflow of Raccoon Creek tributaries caused a partial shoulder collapse on Route 322 near Swedesboro Road, creating major traffic delays. At Rowan University in Glassboro, flooding was severe enough to require kayaks for navigation in parking lots during student move-in week. In response to weather challenges, New York City officials launched an $8.4 million flood mitigation initiative in Queens. ## Claims - Nassau County Executive Bruce Blakeman declared a state of emergency following storm damage. (corroborated by 8 sources) - A tornado caused significant damage in Dover, Delaware. (corroborated by 8 sources) - A Tornado Watch was issued for over 15 million people across Delaware, D.C., Maryland, New Jersey, Pennsylvania, and Virginia. (corroborated by 6 sources) - A possible tornado was reported in Graves County, Kentucky, overnight Thursday. (corroborated by 5 sources) - A Flood Watch has been extended to include New York City, most of New Jersey, and southeast Pennsylvania, including Philadelphia. (corroborated by 5 sources) - A level 3 out of 4 flash flood risk was issued for central and northern New Jersey and New York City. (corroborated by 5 sources) - A strong summer storm is delivering a month’s worth of rain to the Northeastern United States. (corroborated by 4 sources) - Flooding caused a closure of the Long Island Expressway in Queens in both directions. (corroborated by 4 sources) - Flood watches cover more than 35 million people across New York, New Jersey, Connecticut, Pennsylvania, Massachusetts and Vermont. (corroborated by 3 sources) - Rainfall totals of 2‑5 inches are expected region‑wide, with isolated amounts up to 7‑9 inches. (corroborated by 3 sources) - The National Weather Service warned of life‑threatening flash flooding in New York City and surrounding areas. (corroborated by 3 sources) ## Timeline ### 2026-08-28: New Jersey thunderstorms cause flash flooding and vehicle rescues Heavy thunderstorms dropped over five inches of rain across New Jersey, causing flash flooding, vehicle rescues, and water damage at Rowan University. 2 sources. https://clstr.news/cluster/new-jersey-thunderstorms-cause-flash-flooding-and-vehicle-rescues ### 2026-08-27: Storm damage and flood mitigation efforts reported in New Jersey and Queens Heavy storms caused road collapses and flooding in New Jersey, while Queens implements a new green space initiative to mitigate future flood risks. 4 sources. https://clstr.news/cluster/storm-damage-and-flood-mitigation-efforts-reported-in-new-jersey-and-queens ### 2026-08-23: Tornadoes and flash flooding strike Long Island and Delaware Tornadoes and flash flooding struck the Northeast US, including Long Island and Delaware, causing property damage and trapping dozens in vehicles. No serious injuries were reported. 2 sources. https://clstr.news/cluster/tornadoes-and-flash-flooding-strike-long-island-and-delaware ### 2026-08-19: Northeast US storms cause tornado damage and widespread flooding Severe storms, tornadoes, and flash flooding struck the Northeast and Mid-Atlantic, causing significant property damage in Dover, Delaware, and Long Island, New York, and trapping motorists in floods. 27 sources. https://clstr.news/cluster/severe-storms-and-flash-flood-threats-target-i-95-corridor ### 2026-08-05: Flash Flood Warnings Sweep New Jersey and Pennsylvania National Weather Service flash‑flood warnings cover New Jersey and Pennsylvania, prompting road closures and safety alerts; a heat advisory also warns of near‑100 °F temperatures. 5 sources. https://clstr.news/cluster/flash-flood-warnings-sweep-new-jersey-and-pennsylvania ### 2026-08-03: East Coast Flash Flood Threat Disrupts Travel and Sparks Flight Cancellations Heavy rain and thunderstorms across the U.S. East Coast triggered flash‑flood warnings for major cities and forced widespread flight cancellations at New York area airports, stranding thousands of travelers. 2 sources. https://clstr.news/cluster/east-coast-flash-flood-threat-disrupts-travel-and-sparks-flight-cancellations ### 2026-08-02: New York‑New Jersey Flood Warning Issued as Heavy Storms Approach The NWS New York warned of flash‑flooding and strong winds in northeast New Jersey, the Hudson Valley and southwest Connecticut as heavy rain moves in Sunday‑Monday. 2 sources. https://clstr.news/cluster/new-yorknew-jersey-flood-warning-issued-as-heavy-storms-approach ### 2026-07-31: Northeast US faces renewed heavy rain and flash flood risk A new low‑pressure system will bring heavy rain and flash‑flood risk to the Northeast US after earlier historic rains left the area saturated. 5 sources. https://clstr.news/cluster/northeast-us-faces-renewed-heavy-rain-and-flash-flood-risk ### 2026-07-28: Rain showers persist across New York's Finger Lakes and Central region Scattered showers linger over New York’s Finger Lakes and Central region mid‑week with temps near 70 °F, easing to drier conditions by Thursday. 4 sources. https://clstr.news/cluster/rain-showers-persist-across-new-yorks-finger-lakes-and-central-region ### 2026-07-28: Northeast US faces life‑threatening flash floods as summer storm dumps month‑long rain A midsummer storm is dumping month‑long rain on the Northeast US, putting 35 million people under flood watches, prompting state alerts, road closures and dozens of rescues. 19 sources. https://clstr.news/cluster/new-york-governor-kathy-hochul-issues-flood-alert-for-hudson-valley ### 2026-07-26: Northeast US braces for flash‑flood threat as unusually strong summer storm moves inland A powerful summer storm will bring 2‑6 inches of rain to the Northeast US Tuesday‑Wednesday, prompting Flood Watches and flash‑flood warnings for NY, NJ, CT, PA and parts of New England. 10 sources. https://clstr.news/cluster/northeastern-us-faces-renewed-thunderstorms-and-heavy-rain-this-week ### 2026-07-24: Dry Weather Expected in New York's Finger Lakes Through Weekend, Showers Return Sunday High pressure brings dry, warm weather to the Finger Lakes through Saturday, with a higher chance of showers Sunday and thunderstorms early next week. 3 sources. https://clstr.news/cluster/dry-weather-expected-in-new-yorks-finger-lakes-through-weekend-showers-return-sunday --- Cite as: Northeastern US flash-flood and severe weather emergency. CLSTR, https://clstr.news/situations/northeastern-us-summer-weather-outlook