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Thunderstorm Outlook

Valid to Midnight Friday 17 Aug 2018
Issued at 8:36am Friday 17 Aug 2018

Several fronts are forecast to cross the country during Friday, with upper level temperatures over New Zealand continuing to cool.

There is a moderate risk of thunderstorms about Waikato, Auckland, Northland, Coromandel and parts of Bay of Plenty this morning and early afternoon. These thunderstorms may be accompanied by localised heavy rain with intensities of 10 to 25mm per hour and hail of 5 to 15mm diameter.

There is also a low risk of thunderstorms extending south of this area down to Waitomo and northern Gisborne during this morning and afternoon.

About northern Westland, Buller, northwest Nelson, Horowhenua Kapiti Coast, coastal parts of Manawatu and Whanganui, and also about Taranaki, there is a low risk of thunderstorms throughout today.

As a trough and front move up the east of the South Island, there is also a low risk of thunderstorms for a time during this afternoon or evening through Canterbury, as indicated on the chart.

No other areas of severe convection or thunderstorms are expected.

Valid to Noon Saturday 18 Aug 2018
Issued at 10:33am Friday 17 Aug 2018

A series of weakening troughs and fronts move onto and over central and northern New Zealand during Saturday morning.

There is a low risk of thunderstorms in the west of the North Island from Waikato to coastal Manawatu, and also about parts of Bay of Plenty as indicated on the chart.

There is also a low risk of thunderstorms for southern Wellington and coastal Wairarapa with a front moving north.

No other areas of thunderstorms or significant convection are expected.

Valid to Midnight Saturday 18 Aug 2018
Issued at 10:37am Friday 17 Aug 2018

The weakening troughs and fronts continue to move over the North Island during the second half of Saturday.

There is a low risk of thunderstorms during Saturday afternoon for southern Taranaki and Whanganui, and also for Taupo and Bay of Plenty.

For Hawkes Bay and Gisborne, there is also a low risk of thunderstorms with the front moving north during Saturday afternoon and evening.

No other areas of thunderstorms or significant convection are expected.