Lake breeze at night?
 

Here is a met question
I am currently living at a latitude of S1'50 ish, next to lake Kivu hope your geography is up to scratch.

Now this is my question: round about 9pm local time you can almost set you watch by it every single night we get an onshore breeze not sw,se,ne but from directly south of about 10kts.
this will continue for a few hours whipping up the water.

lake breezes genrally would happen by day and land breezes by night so why do we get quite strong breeze at night at this particualr time, on time, everytime at night? There are no thunderstorms, sky is clear prior to the breeze there is not a jot of wind dead calm. Is it something to so with the pressure gradiant slacking allowing the coriolis force to change a direction of airflow or what? But then at S1'oo there aint much coriolis here ...I am intrigued

:confused:

Not sure of the exact topography of your region but I would suggest it might be a katabatic wind. This is most likely to occur in the early hours of the night when solar radiation has ceased and cooling air starts descending down a hillside due to its higher density.

Talking of late night breezes - there was one towards the back of the cabin on a Virgin 747 I was on a month or so ago. Didn't last very long - twenty seconds or so - but it was a pronounced movement of air tailwards.

I had just thought through possible causes enough to start to get seriously worried - we were in the cruise somewhere over the North Atlantic - when it stopped. Nothing else happened.

R