Severe Thunderstorm Watch Get File

Severe Thunderstorm Watch

Issued : 8:31am Monday 1 Mar 2021
Severe Thunderstorm Watch

Issued at 8:31am Monday 1 Mar 2021Threat period: 9 hours from 2:00pm to 11:00pm Monday

This watch affects people in the following weather forecast districts:Northland, Auckland

Thunderstorms may become severe in western parts of Northland and northwestern parts of Auckland from afternoon through to tonight, delivering localised downpours with rainfall rates of 25 to 40 mm/h.

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.

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

This watch will be updated by 11:00pm Monday 1 Mar 2021

Probability/Confidance Map
Valid Till 11:00pm Monday 1 Mar 2021

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.

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