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Opération Harmattan happened on 2011-03-19.
The harmattan is a dry Saharan wind from the direction of the Sahara desert.
Harmattan is the correct spelling for the dry and dusty seasonal trade wind in Western Africa.
See the related link below.
The Harmattan is a cold-dry and dusty trade wind, blowing over the West African subregion of the Sahara Desert.
The Harmattan is a hot, dry and dusty wind (continental trade wind) blowing over West Africa. I know not why it might be delayed.