Wellington Rainbow

Written by Chris Noble, Meteorologist

With a superb view over Wellington and the harbour from the MetService building in Kelburn, we're often (and quite appropriately) treated to some fantastic weather related vistas. Here's a little sample, snapped on Monday 26 October 2009 as a few light showers passed over the city in a northerly flow late afternoon.

The Structure of Lows - part II

Written by Chris Webster, Meteorologist

In my previous blog post I pointed out that tropical lows and cyclones don't have fronts like the lows we're used to around NZ, but rather, a core of warm air near the centre. I'd like to follow up by further contrasting tropical and mid-latitude lows, and looking a bit more closely at tropical cyclones and how they can affect our weather in New Zealand.

Early October Snow

Written by Bob McDavitt
October 2009

The snow that closed the Desert Road and Napier-Taupo Road from Sun 4th to Tue 6th  October 2009 was unseasonable.  It was caused by a low pressure system deepening over the area at the same time as a cold southerly flow arrived, resulting in moist air being cooled from below in a cauldron of lowering pressure.  This produced an unusually heavy amount of snow over a wide area. The weather map for noon on Sunday shows the low pressure system forming over the Central North Island

Types of weather

Written by Chris Webster, Meteorologist

The World Meteorological Organization (WMO) sets recommended practices for coding and reporting weather observations and forecasts. For aviation reports, these codes are set in consultation with the International Civil Aviation Organization (ICAO).