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Africa Hazards Briefing August 9, 2011

Africa Hazards Briefing August 9, 2011. Miliaritiana Robjhon miliaritiana.robjhon@noaa.gov. 850 hPa Wind Vector and Anomalies. Anomalous easterly winds have enhanced the westward propagation of waves across West Africa.

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Africa Hazards Briefing August 9, 2011

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  1. Africa Hazards BriefingAugust 9, 2011 Miliaritiana Robjhon miliaritiana.robjhon@noaa.gov

  2. 850 hPa Wind Vector and Anomalies • Anomalous easterly winds have enhanced the westward propagation of waves across West Africa. • The extension of rainfall into the Afar region of Ethiopia was associated with anomalous southerly winds.

  3. Weekly Rainfall Totals: West Africa Last Week This Week • Rainfall was more localized, with a MCS bringing downpours in western Mali. • An increase in rainfall was observed in the Gulf of Guinea region.

  4. Last Week This Week 7 Day 30 Day

  5. Nganda, SN Niamey, NG

  6. Kano, NA Lagos, NA

  7. Seasonal Rainfall Performance Anomaly Percent Average • To date, poor rainfall performance has been observed in central Senegal, southwestern Niger, and local areas of Nigeria.

  8. Vegetation Conditions NDVI anomaly Vegetation Health Index Source: NESDIS/STAR • Both the VHI and NDVI anomaly show relatively poor conditions in central/northern Senegal and southwestern Niger.

  9. July 2011 rainfall over Ethiopia Percent average Total Below-average rainfall observed across portions of the Gambella, Benishangul-Gumuz, and Tigray regions. Source: Ethiopian Meteorological Agency

  10. Weekly Rainfall Totals: Eastern Africa

  11. Last Week This Week 7 Day 30 Day

  12. Kassala, SD Rumbek, SS

  13. Asmara, ER Nekemte, ET alternating wet and dry spells

  14. Seasonal rainfall Performance Percent average Anomaly

  15. Vegetation Conditions NDVI anomaly Vegetation Health Index Source: NESDIS/STAR • Poor conditions were observed throughout central Sudan.

  16. 1200 Z 17 May 2011 IR Satellite Imagery

  17. GFS 7-day Verification • GFS overestimates seasonal rainfall in western Ethiopia. • Wet (dry) bias in the Gulf of Guinea (northern half of western Mali, …).

  18. GFS 1-week Rainfall Forecast

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