During a nor'easter, what often causes coastal flooding?

Coastal flooding during a nor'easter is primarily caused by storm surges. A nor'easter is a type of powerful storm that typically occurs along the East Coast of the United States, and it can bring strong winds, heavy precipitation, and significant coastal impacts.

Storm surges refer to the rise in sea level that occurs due to strong winds pushing water toward the coast, combined with the low atmospheric pressure associated with the storm. When a nor'easter develops, the combination of sustained strong winds and the storm's structure can lead to a pronounced surge of water that inundates coastal areas. This inundation can lead to severe flooding, particularly in low-lying regions and areas that are already vulnerable to flooding during high tides.

Understanding the role of storm surges emphasizes the need for preparedness and awareness during such weather events, as they can devastate coastal infrastructure and impact local communities.