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Characterization of Onset, Cessation and Moisture Conditions in Rainy Seasons of Westrn Oromia

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Author Affiliations

  • 1National Meteorological Agency, SNNPR Meteorological Service Center, Hawassa, Ethiopia
  • 2Department of Physics, Adama Science and Technology University, Adama, Ethiopia
  • 3Institute of Geophysics, Space Science and Astronomy (IGSSA), Addis Ababa University, Ethiopia
  • 4National Meteorological Agency (NMA) of Ethiopia, Addis Abeba, Ethiopia

Int. Res. J. Environment Sci., Volume 11, Issue (2), Pages 25-30, April,22 (2022)

Abstract

In Ethiopia, Rainfall variability has a major impact on Agricultural productivity and economies. The study aims to analyses variability of onset, cessation, NRDs and Moisture conditions (SPI) in 3, 6, 9 and 12 time scales by using statistical method over western Oromia for the period of 1981-2016. The northern parts of the region (East & West Wollega) experiences high rainfall during Kiremt. Belg rainfall has a considerable amount contribution to the annual rainfall over the southern parts of region (Jimma and Illubabor). The early onset of rainfall occurred over Jimma zones in the 3rd dekade of March, in the 1st dekade of April over the most parts of Ilubabor, and lately in the 3rd dekade of April to 1st dekade of May over the east and west wellega following the northward propagation of ITCZ. Cessation was earlier over the most parts of East and West wollega before the first decade of November and before 3rd decade of November over the east and west of jimma and south of Illubabor zones. The study revealed the climate of rainfall and the region as whole experience more near normal moisture conditions (from 26 to 32 times) than other condition categories for all SPI time scales in 36 years events which are necessary information for agriculture operations, hydrological management and mitigation of impacts

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