[PvK]

Note that units, even if they can see the enemy, won't initiate combat if they themselves are all cloaked.

Also, combat does not block strategic movement - the results of combat may slow/stop/destroy units, of course.

Finally, damaging storms do seem to be able to stop ships, either by destroying means of propulsion, or by simply clearing orders, although I'm not entirely sure what the criteria are for this to happen. Storm damage is like mine damage, though - it only occurs when entering, so units already present in the storm or minefield won't be hurt if they just remain there.

PvK