Why do local winds along coasts and mountains sometimes reverse daily?

Answer 1

Yes on both cases especially when the sun is out during at least part of the day. The main exception of when this is likely not to occur is when a storm is approaching or when we are dealing with strong winds blowing from at the surface and at the above levels (all blowing nearly in the same direction). Also cloudy skies can reduce the chances of this from happening by reducing the difference in temperature.

Why this occurs?

Along the coast, the difference in surface temperatures and pressure between the land and water will produce an onshore flow (sea to land) or sea breeze with the heating of the day. During the night, when the land starts to cool off, a land breeze develops where the surface wind starts to blow from land to sea.

In the mountain, the heating of the day will produce an uphill wind as the valley heats up and warm air rises up the hill. This is known as upslope of up valley winds. At night, wind flows back towards the lower elevation as the air cools and sinks. This is known as down valley winds or mountain drainage winds. Knowing this fact is very important for fire weather forecasters that produce spot forecasts for wild fire protection and prevention.

Answer 2

because the ground gets warm during the day and cools off at night, while the ocean stays the same temperature. This causes the wind to reverse directions.

Answer 3

Oceans do not heat up with the day or cool down much at night, but the land does. These unequal temperatures cause unequal pressures that tend to push the air from the land to the sea in the morning (land breeze) and from the sea to the land in the afternoon (sea breeze)

Answer 4

1-during the day the land is warmer than the sea so the wind blows from sea to the land and vice versa during the night.

the same phenomena is for the montains

Answer 5

This phenomena is called the Diurnal Cycle and is caused by differential heating during night an day.