Thunderstorms and Rain at the Jersey Shore

As a cold front from Canada merges with hot air moving up from the South, thunderstorms are expected to develop at the Jersey Shore late Thursday afternoon and into the evening, according to the National Weather Service's Mount Holly station. The agency said this convergence would create a corridor of enhanced rainfall stretching from Interstate 95 east to the northern Mid-Atlantic coast.

At the Shore, rain showers during the early part of Thursday, August 20, are forecast to build into thunderstorms after 3 p.m., with new rainfall amounts between a quarter and half an inch possible. The thunderstorms are expected to dissipate by 8 p.m., but periodic rain showers could continue until about 2 a.m. on Friday, August 21.

Friday is expected to bring mostly sunny skies with a high near 80, according to the Asbury Park Press report. But the weekend may bring intermittent showers, mostly cloudy skies, and high temperatures in the upper 70s to low 80s.

As of Wednesday, no small craft advisories are in effect for boaters, though the forecast suggests packing foul weather gear. NOAA's coastal forecast predicts light breezes shifting from northwest on Thursday to northeast, then east, and back to northwest on Sunday, with seas of 2 to 4 feet.

Marine Hazard Warning

A separate report from the Press of Atlantic City indicates that a Special Marine Warning was in effect until 7:45 AM EDT for coastal and outer waters from Sandy Hook to Cape May, New Jersey. Strong thunderstorms were moving southeast at 25 knots, with wind gusts of 34 knots or greater and small hail expected. The affected areas span dozens of reefs and coastal communities, including Sea Girt Reef, Atlantic City, Atlantic Highlands, and Barnegat Light.

The warning said small craft could be damaged by higher winds and waves, and noted the potential for sudden changes in sea conditions. It advised mariners to move to safe harbor until the hazardous weather passes and to report severe weather to the Coast Guard or the National Weather Service. The alert also encouraged monitoring weather.gov or on local news outlet's weather page for updates.

Showers and Storms Before a Cold Front

For the broader New Jersey region, forecasters anticipated several rounds of showers and thunderstorms late Saturday night into Sunday morning, driven by a cold front approaching the region. According to a report from the National Weather Service, the cold front was set to trigger – and the threat of strong or possibly severe storms with gusty winds and localized flash flooding, particularly across northern New Jersey.

Pockets of heavy rain could cause localized flash flooding, though widespread flooding is not expected. The service said most areas should see partly to mostly sunny skies by Sunday afternoon, though a small threat of pop-up showers and isolated thunderstorms could linger into the evening. Afternoon temperatures are expected to reach about 80 degrees.

Earlier Saturday, scattered showers affected parts of southern New Jersey, especially Cape May County, which was under a marginal risk for excessive rainfall. Most of northern and central New Jersey saw cloudy skies but no rain.

Before the cold front passes, another report indicated that an isolated severe thunderstorm cannot be ruled out through daybreak, with heavy rain and gusty winds possible. After the front moves through late Sunday morning, skies should clear as drier air arrives, humidity drops, and west to northwest winds of 10–15 mph with gusts up to 20 mph follow.

A forecast on Sunday night is for clear, calm conditions, but Monday might bring isolated to widely scattered showers and a slight chance of thunderstorms, particularly across northern New Jersey. Winds could gust to 20 mph.

A Midweek Break, Then More Rain

Following the Sunday system, high pressure will build on Monday night and dominate through Wednesday, with forecasters predicting dry and tranquil conditions and near-seasonable temperatures. multiple services indicated this stretch of fair weather could last into the middle of the week.

But by Thursday, a new system moving from the west will bring increasing chances of showers, with rain likely Thursday night across most of the state, and showers persisting into Friday, with thunderstorms possible.

Similarly, according to two reports, late-week rain chances return, with showers likely in the Northeast. Another forecast for the Staten Island area details that Thursday into Friday will bring a greater coverage of showers and thunderstorms as a low-pressure system approaches, with highs in the low to mid-80s and high humidity that could result in heat index values into the mid-80s.

This report mostly covers the period from early Thursday through the weekend, including the marine weather watch and the broad pattern of the rain and thunderstorms from the changing weather patterns.