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New Thunderstorm Watch Issues

Last updated: September 17, 2017, 3:16:03 AM

 

SEVERE THUNDERSTORM WATCH

Issued by MetService at 01:10 pm Sunday 17 September 2017
Valid until Midnight Sunday 17 September 2017
This watch affects people in the following weather forecast districts:
Northland
Auckland
Great Barrier Island
Coromandel Peninsula
Waikato
Waitomo
Taumarunui
Bay of Plenty
Rotorua
Taranaki

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An active front is expected to reach Taranaki late this afternoon and then cross the North Island during the evening. Thunderstorms are likely with and following the front, these thunderstorms will bring heavy rain or showers, strong winds gusting 100 km/h, hail and the risk of a small tornado. There is also a moderate risk that a few of these thunderstorms could become SEVERE, producing damaging winds of 110 km/h or stronger or a damaging tornado.

 

Wind gusts of this strength can cause some structural damage, including trees and power lines, and may make driving hazardous. If any tornados occur, they will only affect very localised areas.

 

 

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 Get Thru website

Issued by: Gerard Barrow

This watch will be updated by: 09:00 pm Sunday 17 September 2017

 

Severe Thunderstorm Criteria

In New Zealand, MetService classifies a thunderstorm as severe if one or more of the following criteria are met:

Heavy rain (from thunderstorms):
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.

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Issued by MetService at 08:12 am Wednesday 08 March 2017
Valid until Midday Wednesday 08 March 2017
This watch affects people in the following weather forecast districts:
Northland
Auckland
Great Barrier Island
Coromandel Peninsula
Waikato
Bay of Plenty

An active frontal band is moving across the upper North Island this morning, bringing heavy

rain as detailed in the SEVERE WEATHER WARNING and WATCH. There is a moderate risk of

LOCALISED DOWNPOURS and SEVERE THUNDERSTORMS this morning over the east of

Northland, Auckland, northern Waikato, Coromandel Peninsula and western Bay of Plenty.

This risk eases from the west during this morning. These downpours and/or thunderstorms

may produce localised rainfall rates of 25 to 40mm/hr and possibly more. Rainfall of this

intensity can cause 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.

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 Get Thru website

Issued by: Heath Gullery

This watch will be updated by: Midday Wednesday 08 March 2017


 

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SEVERE THUNDERSTORM WATCH

Issued by MetService at 10:21 am Tuesday 07 March 2017
Valid until 08:00 am Wednesday 08 March 2017
This watch affects people in the following weather forecast districts:
Auckland
Coromandel Peninsula
Waikato
Bay of Plenty

An active frontal band is forecast to move across the upper and central North Island overnight

Tuesday and early Wednesday morning, bringing heavy rain as detailed in the SEVERE

WEATHER WARNING and WATCH. There is a moderate risk of SEVERE THUNDERSTORMS

with this front over southern Auckland, northern Waikato, Coromandel Peninsula and western

Bay of Plenty from tonight through to early Wednesday morning. These thunderstorms may

produce localised rainfall rates of 25 to 40mm/hr. Rainfall of this intensity can cause 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. MetService will continue to monitor the situation closely for severe

thunderstorm development and will issue further updates.

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 Get Thru website

Issued by: Heath Gullery

This watch will be updated by: 10:00 pm Tuesday 07 March 2017

 

SEVERE THUNDERSTORM WATCH

 

Issued by MetService at 03:58 pm Tuesday 28 February 2017
Valid until 09:00 pm Tuesday 28 February 2017
This watch affects people in the following weather forecast districts:
Auckland
Waikato
Waitomo
Taumarunui
Bay of Plenty
Rotorua
Taupo
Taranaki
Taihape

 

Scattered heavy showers with thunderstorms are expected over the central North Island from southern Auckland (south of the Manukau Harbour) through Waikato and inland Bay of Plenty/Rotorua to inland North Taranaki and Tongariro National Park this afternoon and evening.

 

These thunderstorms will be accompanied by localised heavy rain and small hail.

 

A few of the thunderstorms may be severe producing localised downpours of 20-40mm/hr.

 

Rainfall of this intensity can cause surface 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.

 

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 Get Thru website

 

Issued by: John Crouch

 

This watch will be updated by: 09:00 pm Tuesday 28 February 2017

 

 


SEVERE THUNDERSTORM WATCH

Issued by MetService at 08:55 am Tuesday 28 February 2017
Valid until 09:00 pm Tuesday 28 February 2017
This watch affects people in the following weather forecast districts:
Auckland
Waikato
Waitomo
Taumarunui
Bay of Plenty
Rotorua
Taupo
Taranaki
Taihape

Scattered heavy showers with thunderstorms are expected to develop over the central North Island this afternoon. From southern

Auckland (south of the Manukau harbour) through Waikato and Bay of Plenty and Rotorua to inland North Taranaki and northern

Taihape including Tongariro National Park, there is a moderate risk that some of these thunderstorms could become SEVERE,

producing localised downpours of 25 to 40mm/hr. Rainfall of this intensity can cause 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.

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 Get Thru website

Issued by: Gerard Barrow

This watch will be updated by: 08:00 pm Tuesday 28 February 2017

 


 

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