Weather for New England and the Northeast

**Area Forecast Discussion, National Weather Service Boston/Norton MA**

**317 AM EDT Fri Jul 17 2026**

**What Has Changed**

The risk for excessive rainfall and potential street flooding has increased for Saturday and Saturday night, especially along the South Coast. The severe weather risk has also been increased for Saturday and Saturday night.

**Key Messages**

* Drier and seasonable with better air quality today, but smoke could return again tonight and overnight.

* Very muggy Saturday with showers and thunderstorms. Torrential rainfall is possible Saturday late afternoon through overnight, mainly along the Rhode Island and Massachusetts South Coast, with a risk for severe weather as well.

* Drying out with much less humidity Sunday into early next week, but the weather pattern becomes active again by the middle of next week.

**Discussion**

**Key Message 1, Drier and seasonable with better air quality today, but smoke could return again tonight and overnight**

A large area of low pressure in the upper atmosphere, known as cyclonic flow aloft, will keep Southern New England seasonably cool while bringing in a fresher and more comfortable air mass today.

Early Friday morning, some areas of Connecticut were still reporting smoke or haze, although air quality was gradually improving as winds shifted in from the north. Forecast guidance indicates the thickest smoke should continue moving south into New York and Pennsylvania.

Today should be the nicest day of the workweek, with mostly sunny skies, comfortable humidity, better visibility, and generally good air quality. During the afternoon, a few localized sea breezes may develop along the coast as northwest winds weaken. High temperatures will reach the lower to middle 80s.

Tonight, winds near the surface turn southerly, allowing moisture and some smoke to return from the southwest. Forecast soundings also indicate an atmospheric inversion will develop. An inversion is a layer of warmer air above cooler air near the ground that limits vertical mixing. If smoke returns beneath this inversion, some areas could notice the smell of smoke or a decline in air quality overnight. At this time, the smoke is not expected to be as widespread as it has been during the past couple of days.

**Key Message 2, Very muggy Saturday with showers and thunderstorms. Torrential rainfall is possible Saturday late afternoon through overnight mainly along the Rhode Island and Massachusetts South Coast, with a risk for severe weather too**

An active weather pattern returns Saturday, especially late in the day and into Saturday night.

After the comfortable conditions on Friday, tropical humidity quickly moves into Southern New England. Deep moisture from the Gulf Coast and the Carolinas will surge northward ahead of a strong cold front approaching from the Great Lakes. At the same time, increasing winds at several levels of the atmosphere will create favorable conditions for organized thunderstorms.

The greatest concern is very heavy rainfall capable of producing localized street flooding and flash flooding, especially where multiple storms pass over the same locations. There is also a secondary risk for severe thunderstorms.

Atmospheric moisture will be unusually high for mid July, allowing thunderstorms to produce extremely efficient rainfall. Forecast precipitation amounts remain somewhat uncertain, but the greatest potential for excessive rainfall appears to be across Connecticut, Rhode Island, and southeastern Massachusetts Saturday evening into overnight.

Although thunderstorms should continue moving rather than remaining stationary, rainfall could still become intense enough to overwhelm drainage systems in urban areas. Cities including Providence, Cranston, Warwick, New Bedford, and Fall River remain particularly vulnerable to rapid flooding during periods of very heavy rain.

Because forecast confidence in the exact placement of the heaviest rain is still limited, a Flood Watch has not yet been issued. Future forecast updates may consider one if confidence increases.

The Weather Prediction Center has raised the excessive rainfall threat to a Slight Risk, Level 2 of 5, for the southern third of Southern New England.

The severe weather outlook has also been increased to Marginal and Slight Risk levels. While atmospheric instability remains fairly limited, tropical environments often do not require extreme instability to produce severe weather. Strong wind shear, meaning changing wind speed and direction with height, could support a few storms capable of producing damaging wet downbursts or even a brief tornado if the strongest winds and instability overlap.

**Key Message 3, Drying out with much less humidity Sunday into early next week, but our weather turns active again by mid next week**

Much drier and more comfortable weather returns Sunday and continues into early next week, with temperatures remaining close to normal for mid July.

By the middle of next week, another strong cold front is expected to approach from the northern Plains while interacting with moisture from the Gulf. This pattern may bring another round of unsettled weather to Southern New England.