WEATHER-SYSTEMS

WEATHER SYSTEMS







   Patterns of weather depend on the nature of the local air mass and pressure system, which can change over the course of a year. For example, in the summer, continental land surfaces heat up,making warm, dry air rise. Theis produces alow pressure weather system, which draws in more warm air from the surroundings and can cause storms. In winter, continental land surfaces cool, and colder ,dense air siks down from the atmosphere above .

Pressure front

     A pressure divided two different air masses. Air masses with different moisture content, density, temperature , and pressure do not mix easily, and the the front between them is offen marked by rising banks of clouds. For example, a low pressure air mass with cold air. Will condense as the air cool, forming clouds and possibly rain.

Monsoons

     Monsoon winds are massive seasonal winds that bring heavy summer rain to subtropical region, such as southeast asia and lndia. In winter, they bring dry, cooler weather. Monsoon winds are strongest in asia, but they also occur in west Africa , northern Australia , and part of north and south America. Monsoon winds change direction between summer and winter.

Hurricanes

      A hurricanes is a huge , rotating tropical storm with high wind and and very heavy rain. These storms it devepled over warm tropical seawater in late. Pressure drawn in warm, moist wind, which spiral upwards as the spin faster. Whern they reach lands hurricanes cause flooding and highly destructive.