Africa hazards briefing august 9 2011
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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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Africa Hazards BriefingAugust 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.

  • The extension of rainfall into the Afar region of Ethiopia was associated with anomalous southerly winds.


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.


Last Week

This Week

7 Day

30 Day


Nganda, SN

Niamey, NG


Kano, NA

Lagos, NA


Seasonal Rainfall Performance

Anomaly

Percent Average

  • To date, poor rainfall performance has been observed in central Senegal, southwestern Niger, and local areas of Nigeria.


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.


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


Weekly Rainfall Totals: Eastern Africa


Last Week

This Week

7 Day

30 Day


Kassala, SD

Rumbek, SS


Asmara, ER

Nekemte, ET

alternating wet and dry spells


Seasonal rainfall Performance

Percent average

Anomaly


Vegetation Conditions

NDVI anomaly

Vegetation Health Index

Source: NESDIS/STAR

  • Poor conditions were observed throughout central Sudan.


1200 Z 17 May 2011

IR Satellite Imagery


GFS 7-day Verification

  • GFS overestimates seasonal rainfall in western Ethiopia.

  • Wet (dry) bias in the Gulf of Guinea (northern half of western Mali, …).


GFS 1-week Rainfall Forecast


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