The waves move generally toward the west in the lower tropospheric
tradewind flow across the Atlantic Ocean. They are first seen usually
in April or May and continue until October or November. The waves have
a period of about 3 or 4 days and a wavelength of 2000 to 2500 km
[1200 to 1500 mi], typically (Burpee 1974). One should keep in mind
that the "waves" can be more correctly thought of as the convectively
active troughs along an extended wave train. On average, about 60
waves are generated over North Africa each year, but it appears that
the number that is formed has no relationship to how much tropical
cyclone activity there is over the Atlantic each year.

I wonder how many times I have never looked at this page until I was
ready to look at the cause.

Now let us perceive if we may; a 3 or 4 day interval with an uptake of
some 12 to 16 perhaps consequent to their being harmonics of a shared
algorithm.

We know that one part of the sum is the time of the phase and that it
must follow a suitable synergy. (That last part may have to fall by
the wayside in light of recent developments.) So what astronomical
phenomena are there that might give us a 3 or 4 day pattern?

Possibly something to do with Libration and mascons...

Mmmm... ...I wonder..