The Hot Front

The fronts represent the separation surfaces of two air masses at different temperatures.

Their study and evolution (known as frontogenesis) is essential to determine current weather conditions and their evolution including winds, cloud systems and precipitation.

Let’s now see in detail what a warm front is and when it occurs.

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Hot Front: division of air masses and cloud system.

You have a warm front when a hot air mass meets a cold one.
Being the lightest warm one, it begins to slide on the cold giving rise to low clouds of the stratiform type that bring long but not intense rains.

The warm area, flowing on the front surface, rises coolly and condenses.

The expected cloud system goes from the Cirri present in the most extreme part of the front to altitudes between 6 to 8 km and highstrate from 4-5 to 6km: both these cloud systems do not bring precipitation to the geographical area below but are indicators front in the presence of decreasing pressure and temperature.

The area with the precipitation is distinguished by low cloud formations such as Nembostrati and Strati.

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It can be summarized by saying that:

Before the arrival of the front is found: cool temperature, decrease of regular pressure, southeast erly winds in the Northern Hemisphere, high clouds and stratiforms.

In the area of interest of the front is found: rising temperatures, leveling of pressure, variable wind, heavy rains, clouds: layers or cumulonmbi.

After the front is found: cloud dissolution, constant pressure sometimes decreasing, wind from Southwest to West, Rising temperature and decreasing rain.

Areas affected by the hot front, unlike the less extensive ones of a cold front,can reach up to 800km-1000km, while the precipitation area is limited to 300-400km.

On the weather maps are indicated by a line with red half-circles.

The weather hot front
Symbol in use on synopsis cards

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