When the equatorial easterlies undercut the tropical maritime air mass, they cause

When the equatorial easterlies undercut the tropical maritime air mass, they cause a line squall. The equatorial easterlies are a type of wind that blow from east to west along the equator. They are warm and humid and often carry large amounts of moisture. The tropical maritime air mass is a type of air mass that is warm and moist, and is often found over the oceans in the tropics. When the equatorial easterlies undercut the tropical maritime air mass, the warm, moist air is forced upward, causing a line squall. A line squall is a narrow band of strong winds and heavy rain that can form along a cold front. It can be accompanied by thunderstorms and lightning, and can be dangerous for ships and other sea-going vessels.