During the week ending on 17 April 2018, the Juba and Shabelle basins in Somalia and in the Ethiopian highlands continued to receive moderate to heavy rains. Following the heavy rains, flash floods were reported in many places within the two basins leading to displacements, inundation of croplands and destruction of property. The table below shows the total rainfall amounts recorded in selected stations within the two basins over the last one week. Map 1 shows the total Satellite Rainfall Estimates (RFE) of last week which shows moderate to heavy rains within the basins. Middle and Lower Juba regions received the highest amounts of rainfall of more than 100mm in total over the week. Map 2 shows the rainfall forecast for coming week valid until 24 April 2018 and is calling for more rains in the basins. Following the good rains river levels along the Juba and Shabelle rivers continued to rise reaching the high flood risk levels in the upper and mid sections of the two rivers. Given the rainfall forecast and the high river levels, there is a high risk of flooding in the middle and lower reaches of the Juba and Shabelle rivers with some sections having experienced overbank river flow due to weak river embankments and open river breakages. Flash floods in built up and low lying areas within the basins cannot be ruled out during the period under review

Long and temporally consistent rainfall time series are essential in climate analyses and applications. Rainfall data from station observations are inadequate over many parts of the world due to sparse or non‐existent observation networks, or limited reporting of gauge observations. As a result, satellite rainfall estimates have been used as an alternative or as a supplement to station observations. However, many satellite‐based rainfall products with long time series suffer from coarse spatial and temporal resolutions and inhomogeneities caused by variations in satellite inputs. There are some satellite rainfall products with reasonably consistent time series, but they are often limited to specific geographic areas. The Climate Hazards Group Infrared Precipitation (CHIRP) and CHIRP combined with station observations (CHIRPS) are recently produced satellite‐based rainfall products with relatively high spatial and temporal resolutions and quasi‐global coverage. In this study, CHIRP and CHIRPS were evaluated over East Africa at daily, dekadal (10‐day) and monthly time‐scales. The evaluation was done by comparing the satellite products with rain‐gauge data from about 1,200 stations. The CHIRP and CHIRPS products were also compared with two similar operational satellite rainfall products: the African Rainfall Climatology version 2 (ARC2) and the Tropical Applications of Meteorology using Satellite data (TAMSAT). The results show that both CHIRP and CHIRPS products are significantly better than ARC2 with higher skill and low or no bias. These products were also found to be slightly better than the latest version of the TAMSAT product at dekadal and monthly time‐scales, while TAMSAT performed better at the daily time‐scale. The performance of the different satellite products exhibits high spatial variability with weak performances over coastal and mountainous regions.

Within the last few days, heavy downpour has been experienced in many parts of the Juba and Shabelle River basins both in Somalia and in the Ethiopian Highlands. Flash floods have been reported in some areas within the basins including Gedo, Bakool and Bay regions. Following the heavy rains, the river  levels have increased drastically in the entire reaches of the two rivers and are a few centimeters to reach the bank full levels at Luuq and Belet Weyne. The rainfall forecast for the next seven days (23 to 29 April, 2018) is pointing towards moderate to heavy rains  within the Ethiopian highlands  and inside Somalia.  Observed river levels along the  Juba and Shabelle Rivers are expected to continue rising further in the coming week following the foreseen heavy rains. There is therefore an immediate high risk of flooding along the two rivers given the current situation. Areas to watch include; Belet Weyne and Jowhar towns (Shabelle) and their environs; where the river levels are currently at full crest, Dollow , Bardheere and Bualle town (Juba) and their environs, Other riverine towns in the Middle and Lower Shabelle regions such as Balcaad and Kurtunwaarey as well as those in Lower Juba. Flash floods in Bay and Bakool regions also cannot be ruled out given the rainfall forecast.

During the week ending on 24 April 2018, the Juba and Shabelle basins in Somalia and in the Ethiopian highlands continued to receive moderate to heavy rains. The high rainfall amounts received over the last week were spread across many parts of the country, as indicated in the total Satellite Rainfall Estimates (RFE) in Map1, with the exception of Puntland where light rains were experienced. Following the moderate to heavy rains flash floods and riverine flooding have been reported in many places within the Juba and Shabelle river basins. The prediction for the coming week (Map 2, valid until 01 May 2018) is a forecast of heavy rains in the Juba and Shabelle basins, both inside Somalia and within the Ethiopian highlands. Other central and northern parts of the country will also receive moderate to high rains in the coming week, according to the forecast. Given the forecast and the current high river levels riverine flooding is likely to continue in the coming week. Flash floods are also likely to occur in low lying build up areas especially in Mudug, Bay and Bakool regions during the forecast period.

The last few days saw light rains in some parts of northern and southern regions in the country. The three days rainfall forecast is pointing towards minimal rains with light showers expected in a few pockets of Sool, Gedo, Middle Juba and the southern coastal areas. The seven days rainfall forecast indicates increased rains both in the Ethiopian highland and southern regions of the country as the week progresses. Given the rainfall forecast, the river levels are expected to continue rising gradually in the coming week with no risk of flooding along the Juba and Shabelle Rivers in Somalia.

Most areas across Somalia remained dry over the last three days, apart from light rains reported in few pockets in Somaliland, and light to moderate rains in parts of Bay region. On 14 March areas surrounding Baidoa town reported some rainfall, while in Buur Hakaba 21mm of rain was recorded same day. The upper parts of the Ethiopian highlands continued to receive light to moderate rains over the last week. Minimal rainfall events are foreseen across Somalia in the coming three days (Map 1); while moderate to high rains are expected in parts of Bay, Bakool and Gedo Regions towards the end of the coming week (Map 2). Given the rainfall forecast, the river levels are expected to remain stable over the coming week with no risk of flooding.

The last few days saw increased rainfall activities in some parts of northern and southern regions of Somalia. The three days rainfall forecast points towards moderate rainfall in parts of Togdheer, W. Galbeed, Middle Juba and Gedo regions with light showers in a few pockets across the country. The seven days rainfall forecast indicates increased rains both in the Ethiopian highland and across Somalia as the week progresses. Given the rainfall forecast, the river levels are expected to continue rising gradually in the coming week with no risk of flooding along the Juba and Shabelle Rivers in Somalia. Users are advised that this is a forecast and at times there may be discrepancies between forecast and actual amounts of rainfall received.

The Gu rainy season occurs in the period between March and June and is marked as the primary cropping season in Somalia. The season starts and ends at different times throughout the country. In the areas bordering Kenya, Middle Juba, northern parts of Middle Shabelle and the northwest corner of the country, the Gu rains starts as early as the second half of March. The rains then intensify in April all over the country. The length of the season also varies across the country from year to year. Minimal rainfall events are foreseen across Somalia in the coming three days with Gedo and Bakool regions expected to record moderate rains. The rains will then spread further in the other southern regions in the course of the week with light to moderate intensity. Given the rainfall forecast, the river levels are expected to remain stable over the coming week with no risk of flooding along the Juba and Shabelle Rivers in Somalia.

The last 24 hours saw light to moderate rains in a few pockets of the southern and central regions of Somalia. The three days rainfall forecast is pointing towards moderate rains in the southern regions and parts of Galduud and Muddug regions. The Ethiopian highlands may also receive moderate rains within the three days. The seven days rainfall forecast indicates increased rains both in the Ethiopian highlands and southern regions of the country as the week progresses. Given the rainfall forecast, the river levels are expected to continue rising gradually in the coming week with no risk of flooding along the Juba and Shabelle Rivers in Somalia.

The Gu 2018 (April to June) rainfall forecast points towards near-normal to below-normal rains within the Juba and Shabelle River basin. However, flooding along the two rivers is likely to occur, especially in areas with open river banks/weak river embankments. FAO SWALIM (Somalia Water and Land Information Management) has updated the status of the river breakages along the Shabelle River and is in the process of updating the Juba by mapping them using available Very High Resolution (VHR) satellite imagery and a Digital Elevation Model (DEM); supported by “ground truthing” field observations where feasible. All the observations reported refers to the latest suitable VHR satellite image available, which is indicated in the online database. Four types of breakages have been identified, namely; open, potential, closed with sandbags and closed. The open breakages are those that are still open as observed on the latest VHR image available, therefore field verification is needed before planning any repair. The potential breakages represent points that have weak river embankments. The closed with sandbags points are defined here as those that been temporarily closed with sandbags making them still vulnerable for further breakages. The closed points are those that were previously open but have since been closed using heavy machinery or other methods, which prevents further flooding in the short term. The attached map show the open, potential and closed with sandbags points along the Shabelle River. In summary, 27 open points were identified long the river. Several other points, which are either potential or temporarily closed with sandbags, have been identified. The methodology is biased towards Remote Sensing (RS) interpretation with only limited “ground truthing” due to access constraints. Open breakages might have been omitted in some cases where satellite images may not have been very clear (e.g. heavy cloud cover) or were not available. Maps of the status of river breakages, with detailed information, have been produced at large scale and can be obtained from SWALIM offices. This information is also available on the SWALIM Flood Risk and Response Management Information System portal.