Radiosondes (weather balloons) measuring upper air temperatures and winds are routinely launched from five stations around New Zealand. At Whenuapai, Paraparaumu and Invercargill they are launched at 1100 and 2300 NZT. At the Chatham Islands and Raoul Island they are launched daily at 1100 NZT.

The upper air data are displayed on tephigrams. They are updated at approximately 0200-0240 and 1400-1440 NZT.

GIF images for viewing on the screen and high resolution postscript (PS) images for printing are provided. To download the postscript images, you will need to use the "Save Link As..." option on your web browser. Otherwise meaningless data will appear on the screen. If any of the images appear out of date, try hitting the reload button on your browser.

An archive of tephigram data is available, normally a charge will be made for recovering data from the archive, for details, contact James McGregor.

The tephigrams are prepared using the Generic Mapping Tools (GMT) package. Comments are welcome.