N.J. weather: Severe thunderstorm threat for parts of state today as excessive heat kicks in

New Jersey residents face a dangerous heat starting Sunday along with the threat of severe thunderstorms in the northern part of the state.

The isolated and scattered thunderstorms could hit counties north of I-78 Sunday morning and afternoon, according to the National Weather Service.

Wind gusts could hit 60 mph, but the weather service noted uncertainty in the thunderstorm forecast.

Temperatures today expected to soar into the mid to upper 90s on Sunday, with heat indices potentially reaching 100 to 110 degrees across the state.

The National Weather Service has issued extreme heat warnings or heat advisories for all of New Jersey.

Temperatures will climb rapidly Sunday, with highs in the mid-90s and potentially reaching 100 degrees in some inland areas.

The combination of high temperatures and humidity will create extremely dangerous heat conditions, with heat indices potentially reaching 105 to 110 degrees.

Air quality alerts have also been issued throughout the state.

Residents are advised to take extreme precautions during this heat event.

The weather service recommends staying hydrated, avoiding outdoor activities during the hottest parts of the day, and checking on vulnerable populations such as elderly neighbors and those without air conditioning.

Cool, air-conditioned spaces like libraries, shopping centers, and community centers can provide relief from the intense heat.

The heat is expected to persist through Monday and Tuesday, with similar dangerous conditions continuing.

Overnight low temperatures will offer little relief, with temperatures likely remaining in the mid to upper 70s.

By Wednesday, temperatures are forecast to begin moderating, with highs potentially dropping into the mid-90s.

Looking ahead, the extended forecast suggests a gradual cooling trend, with temperatures potentially returning to more typical mid-80s by late in the week.

There is some uncertainty about the exact timing of temperature changes, but forecasters expect a cold front to move through the region, bringing a chance of showers and thunderstorms by late Wednesday or Thursday.

Generative AI was used to produce an initial draft of this story, which was reviewed and edited by NJ Advance Media staff.