TownsRuralMarineMtnsMaps

Thunderstorm Outlook

Valid to Midnight Thursday 20 Jun 2019
Issued at 8:39am Thursday 20 Jun 2019

A warm front and associated rainband is forecast to move slowly southwards across the northern North Island later today, with a low risk of thunderstorms in Northland from around midday and about northern parts of Auckland including Great Barrier Island from this evening. Over the waters east of Northland the risk of thunderstorms is considered moderate from late afternoon, and some of these thunderstorms may affect the east coast of Northland for a time this evening. Any thunderstorms that occur are likely to be accompanied by localised heavy rain with intensities of 10 to 25mm per hour.

A second front is forecast to move onto the west coast of the South Island tonight and approach the west of the North Island. There is a low risk of thunderstorms associated with this second front over western parts of the South Island from northwest Nelson to northern Fiordland and also about North Taranaki, as indicated on the chart.

No thunderstorms or significant convection expected elsewhere.

Valid to Noon Friday 21 Jun 2019
Issued at 7:48pm Thursday 20 Jun 2019

Chart reviewed at 7:45pm Thursday and moderate risk area removed from eastern Northland and Great Barrier Island.

A series of fronts are forecast to cross New Zealand during Friday morning and become slow moving over Bay of Plenty by early afternoon.

There is a broad low risk of thunderstorms over northern and western parts of both Islands with the passage of the fronts. However, this risk of thunderstorms is considered closer to moderate about coastal parts of Coromandel Peninsula and Bay of Plenty during the morning, as indicated on the chart. Any thunderstorms that eventuate are expected to produce localised heavy rain of 10 to 25mm per hour.

No thunderstorms or significant convection expected elsewhere.

Valid to Midnight Friday 21 Jun 2019
Issued at 7:51pm Thursday 20 Jun 2019

Chart updated at 7:50pm Thursday and no changes made.

The front over Bay of Plenty mentioned above slowly moves eastwards during Friday afternoon and evening, bringing a period of heavy rain to the area, especially eastern Bay of Plenty where there is a moderate risk of thunderstorms. Any thunderstorms that eventuate are expected to produce localised heavy rain of 10 to 25mm per hour.

There is also a broader low risk of thunderstorms extending over eastern Northland, Great Barrier Island, Coromandel Peninsula, the remainder of Bay of Plenty and northern Gisborne, mainly during the afternoon.

A trough is forecast to move onto Fiordland and southern Westland during the second half of Friday, bringing a moderate risk of thunderstorms to these areas. Any thunderstorms that occur here are expected to produce localised heavy rain of 10 to 20mm per hour and small hail. There is also a broader low risk of thunderstorms extending slightly further east and north, as indicated on the chart.

No thunderstorms or significant convection expected elsewhere.