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Sub-Saharan Africa Rainfall Briefing April 2011

Stay informed on rainfall patterns in Sub-Saharan Africa. Get insights on precipitation anomalies, crop conditions, and forecasts for various regions. Updated data on rainfall measurements and upcoming weather outlook included.

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Sub-Saharan Africa Rainfall Briefing April 2011

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  1. Africa BriefingApril 19, 2011Miliaritiana Robjhonmiliaritiana.robjhon@noaa.gov • Localized heavy rains over southwestern and northeastern Ethiopia • Heavy rains fell locally over southern parts of Sudan

  2. Atmospheric circulation for the last 7 days 850 hPa wind anomalies 200 hPa wind anomalies Dryness in eastern Africa is associated with weak low-level easterly wind anomalies and upper-level anomalous trough

  3. Rainfall Anomaly (mm) Last week This week In general, rainfall deficits are growing in magnitude and extent 7-Day 30-Day

  4. Seasonal (MAR 1 – Present) Precipitation Anomaly Last week This week Rainfall deficits > 100mm

  5. Start of the Season: As of 1st Dekad of April March-May season March-November season Local areas in southern Ethiopia, Sudan, and Kenya experience 3-4 dekads late start for the season

  6. Crop Conditions WRSI As of 1st Dekad of April Long-rains (Maize) March-May rainfall season

  7. Time series of rainfall at individual location YAMBIO ~ -50mm KIBREMENGIST Seen no rain since the last 30 days, with < -60mm

  8. Dryness extends to neighboring countries MOYO ~ -50mm BAIDOA ELDORET < -70mm Despite moderate rains that fell recently, deficits remain

  9. Precipitation Outlook for the GHA GFS 7-day forecast suggests light to moderate rains over dryness-stricken regions of GHA Increased chance for above-average rainfall over central and southwestern Ethiopia, southeastern Sudan, northern Uganda, and western Kenya

  10. Quick look over southern Africa Stark reduction of rainfall as southern African rainbelt is shifting to the north

  11. Rainfall Anomaly (mm) Last week This week • During the last 7 days, rainfall remained near average over much of southern Africa • During the last 30 days, wet (dry) conditions subsided (strengthened) over western (eastern) southern Africa 7-Day 30-Day

  12. DAILY WRSI 11 APRIL 2011 17 APRIL 2011 There was not much change in crop conditions as the southern Africa rainfall season is winding down

  13. Precipitation forecast for southern Africa Heavy rains are expected over central Angola and coastal Tanzania Elsewhere, light to moderate rains are expected during the next week

  14. West Africa Increase in rainfall over southern Guinea, eastern Liberia, southern Cote d’Ivoire, and southeastern Nigeria Reduction in rainfall observed over southern Togo, Burkina Faso, and southern Benin.

  15. Rainfall Anomaly (mm) This week Last week 7-Day Wet conditions observed over southern Cote d’Ivoire and southern Ghana, while dry conditions strengthened over Nigeria 30-Day

  16. Precipitation Outlook for the Gulf of Guinea regions Increased chance for above-average rainfall over the Gulf of Guinea and parts of western equatorial Africa regions GFS 7-day forecast suggests heavy rains locally over eastern Guinea, southern Sierra Leone, and southwestern Burkina Faso for during the next week

  17. Rainfall measurements during the last 24 hours

  18. Latest IR satellite imagery

  19. Proposed new dryness/drought polygon

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