Posts Tagged depression


  • Tropical Cyclone YASI - February 3rd, 2011 , Written By: Bob McDavitt | No Comments

    • Tropical Cyclone Yasi

  • A Lot of Rain - June 3rd, 2010 , Written By: Chris Webster | No Comments

    • There has been a lot of rain in many parts of New Zealand over the past two weeks. One of the few places to escape this was the sunny West Coast of South Island – the days are clear and stunning there when the flow is southeasterly. If you’ve been following the surface weather maps during May you would have [...]

  • On the Cusp - May 3rd, 2010 , Written By: Chris Webster | No Comments

    • MetService issues severe weather warnings to New Zealanders whenever widespread heavy rain, heavy snow or damaging winds are expected. There are formal criteria that events have to meet or exceed for the forecast to be called a success; the wind criteria are in a previous post, while the rain and snow criteria relate to the total falls required [...]

  • The Structure of Lows – part II - October 14th, 2009 , Written By: Chris Webster | 2 Comments

    • 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 [...]

  • The Structure of Lows - October 9th, 2009 , Written By: Chris Webster | No Comments

    • You are probably familiar with seeing lows and highs on our weather maps around New Zealand. See, for example, previous blog posts on a mid-July northern low, How Lows and Highs move and the satellite loop in Winds Aloft. The lows or depressions that affect us in the mid-latitudes are accompanied by warm and cold fronts with [...]

  • How Lows and Highs move - August 24th, 2009 , Written By: Chris Webster | 1 Comment

    • In my blog post about winds aloft there is a loop of satellite images for a week in winter 2008.  It shows that the big cloud features in the mid-latitudes typically travel from west to east. In other words, the features you see on weather maps affecting New Zealand have usually started out roughly in the area of southern Australia. There are exceptions to [...]

   

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