You are watching: A wet monsoon is associated with high rainfall totals and is caused by ________.
The Inter-Tropical Convergence region (ITCZ - pronounce "itch") shows up as a band of clouds consists of showers, through occasional thunderstorms, the encircles the globe near the equator. The solid band of clouds may prolong for countless hundreds that miles and is sometimes damaged into smaller line segments.
It exists due to the fact that of the convergence the the trade winds. In the northern hemisphere the northeast profession winds converge with southeast winds from the southerly Hemisphere. The allude at i m sorry the profession winds converge forces the air up into the atmosphere, forming the ITCZ.
The location of the Inter-Tropical Convergence ar is usually easily seen together a line of cumulus clouds in the tropics. This is the location where northeast winds in the northern Hemisphere converge v the south-east winds indigenous the southern Hemisphere.
The propensity for convective storms in the tropics is come be quick in their duration, commonly on a small scale. But these short lived storms can produce intense rainfall. It is approximated that 40 percent of all tropical rainfall prices exceed one customs per hour.
The ITCZ adheres to the sunlight in that the place varies seasonally. It move north in the north Hemisphere summer and south in the north Hemisphere winter. Therefore, the ITCZ is responsible for the wet and also dry seasons in the tropics.
The sun crosses the equator twice a year in March and September, and also consequently provides for two wet seasons each year. In December and July, when the sunlight is in ~ its greatest extent north (or south) that the equator provides for 2 dry seasons.
Further away from the equator, the 2 wet seasons merge into one, and also the climate becomes more monsoonal, with one wet season and one dried season. In the northern Hemisphere, the wet season occurs from might to July, in the southern Hemisphere from November come February.
Tale of two Cities: Kano and also Lagos
Location the the nation Nigeria.
Because the its location just north of the equator, Nigeria's climate is characterized by the hot and also wet conditions linked with the motion of the Inter-Tropical Convergence ar (ITCZ) north and south the the equator. This is conveniently seen in the regular monthly rainfall for 2 cities, Kano and also Lagos, be separated by 500 mile (800 km).
Location of the nation Nigeria.
When the ITCZ is to the south of the equator, the north-east winds prevail over Nigeria, developing the dry-season conditions. When the ITCZ moves right into the northern Hemisphere, the southern westerly wind prevails as far inland to lug rain fall throughout the wet season.
The implicitly is the there is a an extensive rainy season in the much south that Nigeria, while the far north undergoes long dry periods annually. Nigeria, therefore, has actually two major seasons, the dry season and also the wet season, the lengths the which vary from north to south.
In southern Nigeria, Lagos averages 68.5" (1740 mm) the rain annually. The four observed periods are:The long rainy season i m sorry starts in March and also lasts come the finish of July, through a peak duration in June over most parts of southerly Nigeria.The short dry season is in August and also lasts for 3-4 weeks. This is due to the ITCZ relocating to the phibìc of the region.The short merganser season adheres to the short dry period in August and lasts from at an early stage September come mid-October together the ITCZ moves southern again, through a peak period at the end of September. The rains space not commonly as hefty as those in the lengthy rainy season.The long dried season start from so late October and lasts to beforehand March with top dry conditions between early December and also late February. Vegetation development is generally hampered, grasses dry and leaves fall from deciduous tree due to diminished moisture.
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Chart reflecting the monthly common rainfall for Kano and Lagos, Nigeria
In north Nigeria, Kano averages 32.5" (825 mm) the rain annually. There are only two seasons because the ITCZ just moves into the an ar once a year prior to returning south. The 2 observed periods are:The long dry season from October to mid-May. Through the ITCZ in the southern Hemisphere, the north-east winds and their connected easterlies end the Sahara prevail over the country, bringing dry conditions. This is the period of tiny or no cloud cover.The short merganser season consist of a relatively short period, from June to September. Both the number of rain days and total yearly rainfall decrease progressively from the southern to the north. The rain are usually heavy and short in duration, and also often identified by frequent storms. This results in flash floods.
Chart reflecting the monthly regular rainfall because that Kano and Lagos, Nigeria
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