Well, not just steam actually - there was a fair bit of ash as well in yesterday's eruption at Tongariro. GeoNet keeps a close eye on this sort of thing, and has a camera poised to record anything lively. The time-lapse video of the eruption is as boisterous as you might expect:
Ash samples from the eruption are being analysed and volcanologist Nico Fournier thinks that this eruption might be the start of a series of such outbursts, with further eruptions likely this week and more likely in the coming months.
Photo - Ruapehu eruption 1995
History - Tarawera eruption 1886
Music - Ash - Burn Baby Burn