kelvin
you are wrong!
BECMG 0600/0602 14007KT
represents a forecast permanent change. They expect after 0602 the wind to be 140/7 until the next modifier. Expect runway 16 but it is not a guarantee, as they may be wrong, and notoriously NRT winds are quite fickle, so the change may not happen, but a meteorologist somewhere has thrown his weather prediction sticks in the air and they have come down this way.