Legally you can't log the time for the purposes of obtaining future licences and ratings, because it is only a flight from the point the aircraft moves under its own power,
with the intention of becoming airborne.
The 'intention' would be the point at which a fly/no fly decision is made, which may occur after the aircraft begins moving. It doesn't matter whether you had intention to fly before removing the brakes/seeing the weather deteriorate.
There's nothing stopping you logging the time in your logbook for your own reference, so long as you mark it such that you remember not to take it into account when applying for further ratings/licences in the future.
Hope this helps
