Posts Tagged tropical cyclone


  • Tropical cyclones: extra-tropical transition - February 13th, 2011 , Written By: Steve Ready | 1 Comment

    • On average, about nine tropical cyclones form in the South Pacific tropics between November and April. Three or four of these leave the tropics and nearly all of them undergo a marked transformation to a mid-latitude depression – a completely different weather system – before they reach New Zealand. For a while after this extra-tropical [...]

  • 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 [...]

   

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