The National Weather Service issued an updated coastal flood warning at 4:34 p.m. Saturday, effective from 6 p.m. Sunday through midnight Monday for Middlesex and Monmouth counties.

The weather service says: “Flooding of up to one foot above ground level is expected in low-lying areas near coasts and tidal waterways.”

“At this level, flooding will begin on the most vulnerable roads in coastal and bay communities, as well as along inland tidal waterways. Some roads may require partial or full closures,” the weather service adds. “If you must travel, allow extra time as some roads may be closed. Do not drive around barricades or through waters of unknown depth. Take necessary steps to protect property at risk of flooding.”

Understanding the differences between advisories, observations and warnings

• Flash flood warning: take action!

A flash flood warning is issued when a flash flood is imminent or is already occurring. In areas at risk of flooding, it is important to get to higher ground immediately. A flash flood is a sudden and severe flood that can develop within minutes to hours and can occur even in areas where there is currently no rainfall.

• Flood warning: take action!

A flood warning is issued when flooding is imminent or occurring.

• Flood warning: Please note:

A Flood Warning is issued when flooding is not expected to reach a level of severity that would warrant a warning. However, such a warning may cause significant inconvenience and, if ignored, may result in situations threatening life and/or property.

• Flood warning: Be prepared:

A flood warning is issued when conditions are favourable for flooding. This does not mean that flooding will occur, but it is possible.

In case of flooding: Advice from the weather service for your protection

Flooding can pose a significant threat, especially if you live in a flood-prone area or are camping in a low-lying region. To ensure your safety, the Weather Service offers important flood safety guidelines:

Move to higher ground:

If you are in a flood-prone area or camping in a low-lying area, the first step is to move to higher ground.

Follow evacuation instructions:

If local authorities issue an evacuation order, obey it immediately. Secure your home by locking it before leaving.

Disconnect utilities and equipment:

If time permits, unplug your utilities and appliances. This precaution will minimize electrical hazards during flooding.

Avoid basements and flooded areas:

Avoid basements or rooms where sockets or cables are under water. This way you can avoid electrical accidents.

For safety reasons, evacuate immediately:

If you notice sparks or hear buzzing, crackling, popping or banging noises, evacuate immediately. Do not enter water that may be live.

Avoid going into flood water:

Never attempt to walk through flood water. Even 15 cm of fast-flowing water can sweep you off your feet with full force.

Seek higher ground if you are trapped:

If you become trapped in running water, go to the highest possible point and call 911.

Flooding can occur during heavy rain, especially in low-lying and flood-prone areas. Never drive through water on the road, even if it does not appear deep. According to the weather service, as little as 30 cm of water is enough to sweep away most cars. Stay safe by being prepared and informed.

Advance Local Weather Alerts is a service from United Robots that uses machine learning to compile the latest data from the National Weather Service.