In the image above you can see the 'Azores High Pressure System', (in greens yellows and oranges) which is steering a Hurricane and a tropical storm system in the United States Gulf Region (these low pressure storm systems are blue). Located above the Azores high pressure system you can see the 'Icelandic Low', another permanent feature, and part of the North Atlantic Oscillation (the Azores high and the Icelandic low tend to move further north in the summer months and then further south in the winter).
It is not possible to have a rainy Sahara desert while the Azores High Pressure system remains parked over the Atlantic Ocean, for it is this Azores High which is responsible for creating the drought conditions on the Sahara desert, by generating 'subsidence' (the air falls, rather than rises, and for this reason there is no rain generated).
Now I have been monitoring the weather for the last couple of weeks and I have noticed what happens when the Azores High disappears and is replaced by a counter clockwise low. This weather pattern generates a type of 'conveyer belt' effect, which pulls large amounts of moisture from the tropics over Africa, across the Atlantic to the Amazon, and then up and back around again to the Sahara, while at the same time pulling Pacific moisture across Central America and once again over the Atlantic to the Sahara. At the same time the same low pressure cell that pumps moisture onto the Sahara also pulls moisture from the Pacific up through the Gulf of Mexico and generates flooding in the Deep South of the United States.
In this image from May 5th, 2011, you can see low pressure cells expelled from the Storm systems along the American East Coast pushing out into the Atlantic and pushing aside the Azores high.
In this image from May 9th, 2011 you can see the current state of the Low Pressure cells in the mid Atlantic.
The image above shows the circulation pattern that develops when the Azores High is replaced by a low pressure system spinning counter clockwise in the Atlantic.
Therefore we can see that creating a Garden on the Sahara involves only replacing the Azores High with a low pressure system.
You can watch a small video of this weather pattern by folloowing the link...http://www.youtube.com/watch?v =HS6yBsb7PSA...
According to the forecast of the meteorologists, this Atlantic Low Pressure system is supposed to disappear and be replaced by the typical Azores High Pressure system in the next few days.
What this analysis of the weather reveals is that as part of the trade off for the transformation of the Sahara into a lush meadow would be the perpetual flooding and total devastation of a swath of land along the Mississippi and Ohio rivers in the central United States. If the Sahara is reborn this flooded section of the United States will be permanently transformed into an inland sea, a gigantic uninhabitable swamp. No one will ever be able to live there again.