MetService has issued a severe thunderstorm warning for South Waikato, Matamata Piako, Waipā and Otorohanga.
Meanwhile a Severe Thunderstorm Watch remains in force for Waikato, Waitomo, Taumarunui, Bay of Plenty, Rotorua, Taupō and Taihape.
MetService says the thunderstorm is moving south and is expected to bring heavy rain and frequent lightning.
The severe thunderstorm warning is in place until 6.45pm.