New York City is coming off two rounds of rough weather already this first week in September, and a third system is lined up for tonight. But the freshest guidance out of the National Weather Service tells a different story than the one that's been circulating since Tuesday. Instead of extending Tuesday's storm warnings into tonight, forecasters have actually eased the overnight threat down to the lowest rung on the government's five-level severity scale, according to the local forecast office's discussion posted Wednesday morning. Thursday afternoon, not tonight, is now the stretch meteorologists say deserves the closer watch.
What changed since Tuesday's warnings
Tuesday's storms carried real teeth. Government forecasters had placed New York, New Jersey and Pennsylvania under a slight, level-two severe thunderstorm risk that afternoon, warning of hail, damaging gusts and an outside shot at a quick-hitting tornado along the Hudson Valley corridor. Multiple severe thunderstorm warnings followed through the afternoon and evening, including one covering Staten Island and southern Brooklyn and another farther south along the Jersey Shore, each citing wind gusts capable of snapping tree limbs.
That threat has since faded. Wednesday morning's forecast discussion downgrades the overnight setup to a marginal risk — the bottom category, one notch below Tuesday's — and describes the atmosphere as slow to destabilize before daybreak Thursday. Citywide rainfall is expected to average around half an inch, with any flooding described by forecasters as minor and nuisance-level rather than the kind that overwhelms drains. It's a meaningfully softer outlook than the "severe storms and possible tornado" framing that had been attached to tonight earlier in the week.
Two storms already in the books
The week's rough stretch opened over the weekend, when heavy rain swamped several subway stations as it moved through late Sunday into Monday. CBS News New York reported that service was knocked out on the 1 line through most of Manhattan after flooding near 96th Street, with the 2, 3, E, F, M and R lines also disrupted while the storm was at its worst. The outbreak was also linked to two deaths on the New Jersey side of the river, the outlet reported. New York's transit chief, MTA Chair and CEO Janno Lieber, told the outlet crews "worked their tails off" overnight to have every line running for Tuesday's commute. Lieber has pointed to the math behind the flooding before: the city's stormwater system is built to handle roughly 1.5 inches of rain per hour, and Sunday's downpour blew well past that in a single hour, sending water backing up into stations faster than pumps could clear it.
Tuesday brought round two, with the afternoon-into-evening severe thunderstorms described above. By early Tuesday evening, forecasters had already begun standing the threat down; a severe thunderstorm watch covering the region was called off hours before its scheduled midnight expiration, with the local weather office noting the severe threat for the night was over and any lingering flash flooding in northeast New Jersey was subsiding.
Why Wednesday's daylight hours feel calmer
By contrast, Wednesday's stretch between sunrise and sunset is comparatively mild. High pressure building in from eastern Canada is keeping a frontal boundary parked south and west of the city, leaving New York mostly cloudy with only scattered showers, and those mainly confined north and west of the five boroughs. Highs are expected near the upper 70s under breezy northeast winds, a far cry from the flooding-rain headlines earlier in the week.
Tonight's downgraded, but not zero, risk
The changeover comes after dark. A warm front is expected to lift across the region overnight and continuing into Thursday's early hours, organizing another round of showers and occasional thunderstorms. Rain chances climb into the 60-to-70-percent range overnight, and temperatures are forecast to hold steady in the mid-70s rather than drop the way an evening normally cools — a side effect of the same front dragging warmer, more humid air in ahead of the rain. Localized flash flooding "cannot completely be ruled out," per Wednesday's forecast discussion, but the odds are described as low, and no tornado watch, thunderstorm watch or flood watch was in effect for the five boroughs as of Wednesday morning.
The bigger question mark is Thursday
If there's a day worth watching more closely, forecasters increasingly point to Thursday afternoon. Once the city shifts into the warmer, more humid air mass ahead of an incoming cold front, highs are expected to climb into the mid-80s and instability builds. The local forecast office flagged genuine uncertainty about how strong that Thursday convection could get, saying forecasters are continuing to monitor the setup closely as the week plays out.
Whichever way Thursday breaks, the pattern finally loosens its grip Friday. Forecasters expect drier, less humid air to filter in behind the front, with highs near 82 degrees under a mostly sunny sky — a preview of a largely dry stretch heading into the holiday weekend.
Getting ready before dark
The same precautions New Yorkers have leaned on all week still apply tonight. Anyone in a basement or below-grade unit should have a plan to move up quickly if water starts rising, since flooding in the city's lowest-lying, worst-drained blocks can happen within minutes. Drivers should never try to push through a flooded street, since depth and current are nearly impossible to judge after dark, and pedestrians should give standing water near curbs and subway grates a wide berth. Commuters should build extra time into tonight's and tomorrow's travel given how twice already this week low-lying subway lines have taken on water, and anyone stepping out before the rain arrives should tie down balcony furniture, planters or trash bins that gusty storms could turn into hazards on crowded sidewalks. Charging phones and portable batteries now, keeping a flashlight handy and signing up for the city's free Notify NYC alerts round out the basics for households across the five boroughs.
