You are watching: A wet monsoon is associated with high rainfall totals and is caused by ________.
The Inter-Tropical Convergence Zone (ITCZ - pronounced "itch") appears as a band also of clouds consisting of showers, with occasional thunderstorms, that encircles the globe close to the equator. The solid band also of clouds may extfinish for many kind of hundreds of miles and is occasionally damaged right into smaller sized line segments.
It exists because of the convergence of the profession winds. In the northern hemisphere the northeast profession winds converge through southeastern winds from the Southern Hemispright here. The suggest at which the trade winds converge forces the air up into the environment, developing the ITCZ.
The place of the Inter-Tropical Convergence Zone is commonly easily seen as a line of cumulus clouds in the tropics. This is the area wbelow northeast winds in the Northern Hemispright here converge via the southeast winds from the Southern Hemisphere.
The tendency for convective storms in the tropics is to be short in their duration, typically on a little scale. But these brief lived storms have the right to develop intense rainloss. It is approximated that 40 percent of all tropical rainloss rates exceed one inch per hour.
The ITCZ adheres to the sun in that the place varies seasonally. It moves north in the Northern Hemisphere summer and south in the Northern Hemispbelow winter. As such, the ITCZ is responsible for the wet and also dry periods in the tropics.
The sun crosses the equator twice a year in March and September, and also in turn provides for 2 wet periods each year. In December and July, as soon as the sunlight is at its best degree north (or south) of the equator renders for 2 dry periods.
More ameans from the equator, the two wet seasons merge right into one, and the climate becomes more monsoonal, through one wet seaboy and also one dry seakid. In the Northern Hemispright here, the wet seachild occurs from May to July, in the Southern Hemisphere from November to February.
Tale of Two Cities: Kano and also Lagos
Location of the country Nigeria.
Due to the fact that of its area just north of the equator, Nigeria's climate is defined by the warm and wet problems associated with the activity of the Inter-Tropical Convergence Zone (ITCZ) north and south of the equator. This is quickly watched in the normal monthly rainloss for two cities, Kano and Lagos, separated by 500 miles (800 km).
Location of the country Nigeria.
When the ITCZ is to the south of the equator, the north-eastern winds prevail over Nigeria, creating the dry-season problems. When the ITCZ moves right into the Northern Hemisphere, the south westerly wind prevails as far inland also to lug rain loss throughout the wet seachild.
The implication is that there is a prolonged rainy season in the far southern of Nigeria, while the far north undergoes long dry durations yearly. Nigeria, therefore, has 2 significant periods, the dry seachild and the wet seaboy, the lengths of which vary from north to south.
In southerly Nigeria, Lagos averages 68.5" (1740 mm) of rain every year. The four observed seasons are:The lengthy rainy season which starts in March and also lasts to the end of July, through a height period in June over the majority of parts of southern Nigeria.The brief dry season is in August and also lasts for 3-4 weeks. This is due to the ITCZ relocating to the north of the region.The brief rainy season adheres to the brief dry duration in August and lasts from early on September to mid-October as the ITCZ moves south again, through a top duration at the finish of September. The rains are not typically as hefty as those in the lengthy rainy seachild.The lengthy dry season starts from late October and lasts to early on March via peak dry conditions in between early December and also late February. Vegetation growth is primarily hampered, grasses dry and also leaves loss from deciduous trees as a result of lessened moisture.
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Chart showing the monthly normal rainautumn for Kano and Lagos, Nigeria
In north Nigeria, Kano averperiods 32.5" (825 mm) of rain every year. Tright here are just two periods considering that the ITCZ only moves right into the area as soon as a year prior to returning southern. The two observed periods are:The lengthy dry season from October to mid-May. With the ITCZ in the Southern Hemispbelow, the north-east winds and their connected easterlies over the Sahara prevail over the country, bringing dry conditions. This is the duration of little or no cloud cover.The short rainy season covers a reasonably brief duration, from June to September. Both the number of rain days and also complete annual rainautumn decrease significantly from the south to the north. The rains are mainly hefty and short in duration, and often defined by constant storms. This results in flash floods.
Chart reflecting the monthly normal rainfall for Kano and Lagos, Nigeria
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