Rainfall Patterns in Wollo: Changes and Challenges

Ethiopia's Wollo area is heavily reliant on rain for agriculture, but the amount and distribution of rainfall can vary greatly over time and space. A recent study looked into how much and how often it rained in Wollo from 1981 to 2022. The study used data from the Climate Hazards Group Infrared Precipitation with Stations version two (CHIRPS-v2) to figure out how rainfall changed over time. They used tools like the Standard Rainfall Anomaly Index (SRA) and the Coefficient of Variation (CV) to see how much rainfall varied. They also used tests like the Modified Mann Kendall (MMK) and Sen's slope estimator to see if there were any long-term trends.

The study found that Wollo had seen a lot of changes in rainfall, leading to both droughts and floods. The SRA and CV showed that rainfall varied a lot from year to year and season to season. About 56% of the years had less rain than usual, while 44% had more. The MMK test showed that the main rainy season, called Kiremt, had more rain over the years. But the other two seasons, Belg and Bega, had less rain. The innovative trend analysis (ITA) showed that different stations had different trends in rainfall. In the eastern and northeastern parts of Wollo, the Kiremt season had more rain. These changes in rainfall can be a big problem for farmers and planners. They need to come up with ways to handle the risks of changing rainfall patterns and help communities adapt.

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