Severe Thunderstorm Watch Get File

Severe Thunderstorm Watch


Issued : 3:30pm Sat, 28 Jan
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Severe Thunderstorm Watch

Area: Northland, Auckland, Waikato, Waitomo, Taumarunui, Taranaki

Period: 5hrs 30min from 3:30pm - 9pm Sat, 28 Jan

Forecast: Thunderstorms are expected this afternoon and evening, with some of them becoming SEVERE about western areas of Northland south of Dargaville, through western areas of Auckland and about

Waikato west of Hamilton, in Waitomo, Taumarunui and northern Taranaki until 9pm. Severe Thunderstorms may produce downpours with intensities of 25 to 40 mm per hour.

Rainfall of this intensity can cause surface and/or flash flooding, especially about low-lying areas such as streams, rivers or narrow valleys, and may also lead to slips.

Driving conditions will also be hazardous with surface flooding and poor visibility in heavy rain.

Issued: 3:30pm Sat, 28 JanNext update: 9pm Sat, 28 Jan

Area: Bay of Plenty, Rotorua, Taupo

Period: 15hrs 30min from 3:30pm Sat, 28 Jan - 7am Sun, 29 Jan

Forecast: There is a possibility of thunderstorms about Bay of Plenty and Taupo today and tomorrow. Between early afternoon today and 7am Sunday morning, one or two these thunderstorms may become SEVERE, producing localised downpours with intensities of 25 to 40 mm per hour.

Rainfall of this intensity can cause surface and/or flash flooding, especially about low-lying areas such as streams, rivers or narrow valleys, and may also lead to slips.

Driving conditions will also be hazardous with surface flooding and poor visibility in heavy rain.

Issued: 3:30pm Sat, 28 JanNext update: 9pm Sat, 28 Jan

Note: A Severe Thunderstorm Watch means conditions are favourable for severe thunderstorms in and close to the watch area. People in these areas should be on the lookout for threatening weather conditions and monitor for possible Severe Thunderstorm Warnings.

For information on preparing for and keeping safe during a storm, see the Civil Defence Get Ready website

Probability/Confidance Map
Valid Till 7am Sun, 29 Jan


Severe Thunderstorm Criteria

MetService uses the following criteria for severe thunderstoms in New Zealand:

Heavy rain (from thunderstoms): Rainfall of 25 millimetres per hour, or more.
Large hail: Hailstones 20 millimetres in diameter, or larger.
Strong wind gusts (from thunderstorms): Gusts of 110 kilometres per hour (60 knots) or stronger.
Damaging tornadoes: Fujita F1 (wind speeds greater than 116 kilometres per hour (63 knots)) or stronger.

Note: some tornadic systems such as funnel clouds, waterspouts and small land-based tornadoes are possible with thunderstorms that may not be classified as severe.

Be Advised:
Before making decisions based on this data
please see the information at metservice.com who are the providers of this data