 The low-pressure aria, low-depression, is a region on the topographic map where the atmospheric pressure is lower than that of surrounding locations. Low-pressure systems form under arias of wild divergence that occur in the upper levels of the troposphere. The formation process of the low-pressure aria is known as cyclogenesis. Within the field of meteorology, atmospheric divergence aloft occurs in two areas. The first area is on the east side of upper tropes, which form half of a rosby e-wave within the westerlies the through with large wavelength that extends through the troposphere. The second area of wind divergence aloft occurs ahead of embedded short-waint tropes, which are of smaller wavelength. Diverging winds aloft ahead of these tropes cause atmospheric lift within the troposphere below, which lowers surface pressures as upward motion partially counteracts the force of gravity. Thermal lows form due to localized heating caused by greater sunshine over deserts and other land masses. Since localized areas of warm air are less dense than their surroundings, this warmer air rises, which lowers atmospheric pressure near that portion of the Earth's surface. Large-scale thermal lows over continents help drive monsoon circulations. Low-pressure arias can also form due to organized thunderstorm activity over warm waters. When this occurs over the tropics in concert with the intertropical convergence zone, it is known as a monsoon through. Monsoon tropes reach their northerly extent in August and their southerly extent in February. When a convector low acquires a well-hot circulation in the tropics it is termed a tropical cyclone. Tropical cyclones can form during any month of the year globally, but can occur in either the northern or southern hemisphere during November. The atmospheric lift will also generally produce cloud cover through a diabetic cooling once the air becomes saturated as it rises. Although the low-pressure aria typically brings cloudy skies, which add to minimize diurnal temperature extremes. Since clouds reflect sunlight, incoming short-waint solar radiation decreases, which causes lower temperatures during the day. At night the absorptive effect of clouds on a going long-wave radiation, such as heat energy from the surface, allows for warmer diurnal low temperatures in all seasons. The stronger the area of low-pressure, the stronger the winds experienced in its vicinity. Globally, low-pressure systems are most frequently located over the Tibetan Plateau and in the Lee of the Rocky Mountains. In Europe, particularly in the British Isles and Netherlands recurring low-pressure weathered systems are typically known as depressions.