92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Monday, 23 January 2012
Assessing the Value of Coastal Stations of West Africa Through Data Assimilation Using the WRF Model During NAMMA 2006
Hall E (New Orleans Convention Center )
Johnathan Clark, Howard University, Washington, DC; and G. Jenkins

This study highlights the importance of coastal stations in West Africa in the forecast of synoptic to mesoscale features. Using data from the African Monsoon Multidicplinary Analysis in 2006 as background, extra soundings will be assimilated to quantify the improvements in the WRF forecasts. The domain resolution used was 20km to study dust outbreaks, African Easterly Waves (AEWs), and Tropical Cyclones. A 5-10 km resolution is used for the Squall line cases. Events of interest include: 2 squall lines and a dust event during August 31 2006- September 2 2006, a large 2 day dust outbreak September 3 2006 - September 5 2006, AEW September 7 2006 - September 9 2006, and a dust outbreak and a Tropical depression September 9 2006 - September 12 2006. Experiments are run first with no extra sounding assimilation. Then with coastal or island stations assimilated, which include: Praia (Cape Verde), Abidjan (Ivory Coast), Conakry (Guinea), Dakar (Senegal), Nouakchott (Mauritania). Finally land stations are assimilated including which were not originally transmitted to the global telecommunication system (GTS.

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