Entries tagged "northwest"

Classic Cold Front

2012-02-17

Over the next 48 there will be an opportunity to witness the passing of a classic cold front system in the UK. A cold front is the leading edge of a mass of cold air as it displaces a warmer mass of air at ground level. Cold air is denser than hot air (hot air balloons rise) and so as a cold front advances it slides under the warmer air forcing it up. As the warm air is forced up its moisture condenses. This movement of moist air upwards is often quite dramatic and this can lead…

Tin Bird Trails

2011-09-23

We may never know the exact method that the earliest explorers used to find their way, but there is a friendly finger of suspicion that gets pointed regularly at the birds. Some of the routes used by the pioneers of the Pacific match the migratory routes of the birds exactly. The route used by the Maori fleet that sailed from Tahiti to New Zealand sometime in the fourteenth century and settled there is the same as that taken by the Long-tailed Cuckoo each September. I like to think of these earliest navigators. I imagine them gazing…