Weather

Leaving the Islands on a strong stationary High means there might be a squash on one of its flanks depending on the High’s location.
Leaving the Islands just as a front passes means that she may not make it to New Zealand before the next sequence takes place; thus she may encounter the next Low just as she’s near New Zealand unless she goes like blazes.

Leave Tonga as a High Center is at longitude of NZ. If averages prevail the next Low should arrive in NZ when we arrive at about 28S.
Arriving at about 28S as a Low crosses Northland we may have 4 days before the next one.
Leaving Tonga as a cold front crosses Northland may look good for winds at the start but may also allow us to unforgettably greet the next front as we’re closing with NZ.