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Thunderstorm Outlook

Valid to Midnight Monday 25 Jun 2018
Issued at 8:02am Monday 25 Jun 2018

An unstable showery southwesterly flow with embedded troughs affects the country today.

From Taranaki to Northland, the far east of the Bay of Plenty, the far north of Gisborne, Buller and the far west of Nelson there is a moderate risk of thunderstorms this morning with bursts of heavy rain, hail and strong wind gusts of 90 to 100 km/h. The risk continues this afternoon on the far east of the Bay of Plenty and the north of Gisborne and also in Buller and the far west of Nelson. From Auckland to Taranaki the risk is likely to persist this afternoon and evening.

In the south, in coastal Southland, Fiordland and the south of Westland there is a moderate risk of thunderstorms this evening and at night. These storms may be accompanied by strong wind gusts, 90 to 100 km/h and hail.

There is a low risk of thunderstorms in a broader area as indicated on the chart.

No thunderstorms or significant convection expected elsewhere during the period.

Valid to Noon Tuesday 26 Jun 2018
Issued at 9:27am Monday 25 Jun 2018

The cold showery southwesterly flow continues to affect the country Tuesday morning. A sharp southerly change is expected to affect the Cook Strait area towards midday.

In Buller and the far west of Nelson there is a moderate risk of thunderstorms. The risk os also considered moderate in the morning in Taranaki and in the west of Waitomo. Waikato and Auckland. These storms may be accompanied by strong wind gusts, 90 to 110 km/h and hail.

In Wairarapa there is a moderate risk of thunderstorms with and and after the southerly change in the morning. These storms may be accompanied by strong wind gusts and hail. There is a low risk of thunderstorms over a broader area over the North Island, including Wellington with the southerly change as indicated on the chart.

There is a low risk of thunderstorms before dawn in coastal Otago, Southland, Fiordland and Westland.

No thunderstorms or significant convection expected elsewhere during the period.

Valid to Midnight Tuesday 26 Jun 2018
Issued at 9:32am Monday 25 Jun 2018

A trough is expected to affect the North Island in the afternoon, before moving away to the northeast in the evening.

In the afternoon there is a moderate risk of thunderstorms in Wairarapa. These storms may be accompanied by strong wind gusts. There is also a moderate risk of thunderstorms in Northland, Auckland and in the west of Waikato and Waitomo as indicated on the chart. These storms may be accompanied by strong wind gusts of 100 km/h and hail. There is a low risk of thunderstorms in a broader area as indicated on the chart.

No thunderstorms or significant convection expected elsewhere during the period.