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Understanding The Causes Of Heavy Floods In Kenya

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2 years ago

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Flooding affected not only Kenya, but also the whole of East Africa. On Wednesday, the UN Secretary General Antonio Guterres said he is worried over the high number of deaths as a result of heavy flooding in the region.

“The Secretary-General is deeply distressed to hear of the hundreds of lives lost and many others affected by heavy flooding in Burundi, Kenya, Somalia and Tanzania and other parts of East Africa,” the statement said.

But what are the reasons why we hear more and more often about terrible floods in different parts of Africa?

The seasonal patterns are one of the factors. Africa is characterized by rainy seasons alternating with periods of no rain. In Kenya and several other eastern parts of the continent, the “long rains” season runs from March to May, while the “short rains” season runs from October to December.

Most of the average yearly rainfall in the nation is attributed to the “long rains” season. Often, it is marked by intense downpours that might last into June.
But in its “long rains” season forecast for this year, the Kenya Meteorological Department said that above-average rainfall will hit several areas of the nation, with some seeing periodic storms. Along with other implications, he cautioned of mudflows, landslides, and flash floods.

Severe storms also marked the brief monsoon season of last year, particularly in November, in numerous regions of the country. The meteorological agency reported that several regions had over three times the long-term average rainfall.

These natural cycles are in turn influenced by other, larger patterns. In Kenya’s case, it’s the Indian Ocean Dipole, which is a shifting of sea surface temperatures that causes the western Indian Ocean to be warmer than normal and then colder than average than the eastern Indian Ocean. There are also stages to it — positive, neutral, and negative.

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During the positive phase, there is a significant increase in rains in regions located to the west of the Indian Ocean, including Kenya. So, it is quite likely that the positive Indian Ocean Dipole combined with climate change are to blame for Kenya’s continuous flood-causing rainfall, the media reported, citing Joyce Kimutai, research associate at Imperial College London.

She further explained that increased evaporation of warmer waters brought on by the hotter atmosphere can result in more intense rains.

Moreover, in December of last year, Kimutai and colleagues from World Weather Attribution — a group of scientists that examines whether climate change contributes to extreme weather —found that the “short rains” season in Kenya and other eastern African countries was up to twice as intense last year due to human-caused climate change.
But that’s not all: according to the UN, the situation is aggravated by El Nino, a naturally occurring phenomenon that significantly influences the world climate. This time it began in mid- to late 2023 and was one of the strongest in the record history, according to the World Meteorological Organization (WMO).

“El Nino has been a source of extreme weather patterns globally. These have the effect of undoing decades of developmental progress […],” said UN General Assembly President Dennis Francis.

Add the phenomenon to rainy seasons, Indian Ocean Dipole and climate change, and you have a recipe for disaster.

“In parallel, human-induced climate change is intensifying impacts of El Nino/La Ninaepisodes and increasing climate risks,” WMO Secretary-General Celeste Saulo noted.

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However, these phenomena can be predicted “well in advance”, which can help reduce their consequences, Saulo added.

In the meantime, the country has to cope with the current crisis, which Kenya Meteorological Department predicts will last until June.

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