WEEKLY AFRICAN WEATHER HAZARDS ASSESSMENT STATEMENT APRIL 24 - 30, 2003 DISCUSSION: 1) Long-term dryness from the last 2 years across southern Mauritania has resulted in poor pasture conditions and low water levels. Reports indicate that similar conditions exist in northern Senegal and extreme western Mali. Farmers are struggling and cattle are being moved southward earlier than normal. To further compound the water deficits, extreme heat index values are expected around mid-week. The hot temperatures combined with humidity effects will be well above 50 C for several days. The seasonal rains should start around the first of July and last through October. Current climate forecasts indicate that the region should receive near-normal rainfall during the upcoming wet season. 2) Dryness throughout recent years has resulted in poor pasture conditions and low water levels across north-central Ethiopia, and adjacent portions of Eritrea and Djibouti. Widespread showers have continued throughout much of the hazard area, however, previous seasonal deficits still exist in some locations. More rain is forecast for the upcoming week, which should continue to alleviate some of the long-term dryness and aid in fully replenishing water supplies. 3) Below normal rainfall totals in Guinea have resulted in low reservoir levels, which are used in the generation of hydro-electric power. Rain events are becoming increasingly common in much of the southern areas of the country. These events are typical as per the start of the rainy season in mid to late April. Continued showers could bring up to 50 mm of rain during the coming week in the south and rain is also expected to start in northern portions of the country as well. 4) Most of the area highlighted by yellow in Kenya, southern Somalia, northern Tanzania, Burundi, Rwanda, southern Uganda, and central Ethiopia received at least 25 mm over the past 10 days. Most of these regions were approaching critical rainfall shortages for the impending growing season, but this latest system brought immediate relief. However, several areas highlighted in brown in western Ethiopia, eastern Kenya, and northern Tanzania received minimal amounts totaling less than 10 mm over the same time period. These regions remain critical and should be monitored closely. This is especially true for Kenya and Tanzania as the wet season should be ending within the next few weeks. Forecasts indicate that more rain is expected throughout eastern Ethiopia, western and northern Kenya, southern Somalia, Uganda, Burundi, and Rwanda. In fact, if heavier amounts fall in northern Kenya and southern Somalia the potential for flooding exists, however, the forecast amounts reveal average amounts. The forecast for eastern Kenya and northern Tanzania is again pessimistic for rainfall over the next week, but an onshore flow regime and warmer sea surface temperatures create the potential for rain shower activity in these areas. 5) Locally heavy rains over previously dry soil in southeastern Ethiopia and southern Somalia, have caused saturated conditions. Reports from Jigjiga in southern Ethiopia indicate heavy rains that may cause flooding in the Shebele river that flows into southern Somalia. Recent rains may also affect regions near the Jubba river in southern Ethiopia and Samolia. Flood prone and valley regions should be monitored. 6) Below normal seasonal rains throughout portions of Botswana, South Africa, Mozambique, and Zimbabwe have resulted in lower than normal crop yields for much of the highlighted region. Rain-free days over the next few weeks should actually help farmers as they begin to harvest the surviving crops. The supplemental area highlighted in orange should be monitored for hydrological deficits that will affect drinking water and irrigation in the upcoming secondary growing season. Author: Kevin B Laws