Summer has well and truly arrived, with the heat a big topic of conversation in the RNZ office. MetService has issued a heat alert for Hawke's Bay warning residents to take care as temperatures are expected to hit a high of 34 degrees in Hastings. Gisborne, Napier and Wairoa will also experience temperatures in the early 30s today. That seems hot - especially for early December - but is it? MetService meteorologist John Law joins Jesse