MetService Blog

The word ‘storm’ is frequently misused in the media and colloquially, almost as much as the misuse of the term ‘weather bomb’*.  In the strictest meteorological sense, a ‘storm’ is only a storm if accompanied by storm-force winds, which are defined by the Beaufort scale as having an average speed of over 47 knots (88 km/h). However, there are several other types of storm which don’t require storm-force winds.

Resolution counts

Weather forecasting is basically an ‘initial value problem.’ This means that if weather models could capture the current weather perfectly i.e. correctly initialise the current state of the atmosphere, then in theory, they could forecast the future weather accurately well beyond the present limit of a week or so. After all, the atmosphere is a fluid, and follows strict laws of physics.

An explanation of atmospheric optical phenomena

Here at MetService, people often send us photos of interesting clouds, unusual weather, and also atmospheric optical phenomena. Atmospheric optics is the branch of physics which describes how light interacts with the Earth’s atmosphere, to create a wide range of visual spectacles. Things such as rainbows, ice haloes, and crepuscular rays all come under atmospheric optics, along with many others. These can be observed all around New Zealand under the right conditions.

WEATHER BALLOON LAUNCH PROJECT - MetService, Space Place & Curious Minds NZ

By Lisa Murray, Communications Meteorologist.

Niko and Lucy launch the weather balloon at Paraparaumu workshop Friday 28th Oct 2016.

The photos in this blog were taken by MetService staff in August 2011.

Photo taken by Ian in Karori, a western suburb of Welington.

We’ve just come out of a cold, snowy spell – the most significant of this winter so far. Ski fields nationwide are well topped-up, the Tararua range has been textured with snow after a pretty bare winter, and parts of the central North Island continue to suffer the effects of substantial snowfalls and drifts.

Weather radars are used all around the world to detect rain, hail and snow, as it happens. However, there are times when the radar network can pick up other things as well. While you generally won't see aeroplanes on our radar images (the radar beam is usually beneath the flight path of most flights, and also our radars are calibrated to primarily pick up smaller objects, whereas radars at airports are calibrated differently to primarily pick up aeroplane-sized objects), there is a myriad of other things that can cause interference on our radar images, which I will explain in this blog.

To mark Māori Language Week, this blog post brings together some practical weather words you can use every day, along with the story of Tāwhirimātea – god of the weather. Ko Tāwhirimātea te atua o te hau me ngā āwhā – Tāwhirimātea is the god of winds and storms.

Sitting out in the middle of the ocean, New Zealand is vulnerable to weather extremes from all directions, from the remains of tropical systems barreling in from the north, to cold winter southerlies bringing a blanket of snow.

An explanation of wind speeds and the Beaufort Scale

Sometimes in MetService forecasts, you will see a forecast for “fresh northerlies”. But what exactly does the word ‘fresh’ mean? For many people, the word ‘fresh’ carries connotations of cool or clean air (eg the phrase ‘fresh air’). However, the word ‘fresh’ also has a more technical definition, that comes from the Beaufort Scale.

Mean Wind Speeds vs. Gust Speeds

By meteorologist Emma Blades

As a cold front swept up the North Island on Sunday 24 April 2016 it was like a blanket had lifted leaving blue skies behind. In the classic cold-front scenario, showers usually follow the main rain band. But because the flow was west to southwest behind the front, the South Island was sheltering the North Island from the showers, resulting in clear skies behing the front in this case.