Warkworth region

Tuesday 31st January - Periods of rain, persistent and heavy at times north of Orewa, then everywhere this afternoon or evening. Thunderstorms and downpours possible in the north from evening. Northeasterlies, rising to gale in exposed places this afternoon, gusting 100 km/h from evening.

Heavy Rain Warning - Red

• Period: 15hrs from 5pm Tue, 31 Jan - 8am Wed, 1 Feb
• Area: Auckland north of Orewa
• Forecast: Expect 80 to 120 mm of rain. Peak rates of 10 to 20 mm/h, but localised areas may see downpours of 25 to 40 mm/h. Thunderstorms are also possible.
• Impact: This rain is expected to cause dangerous river conditions and significant flooding. Slips and floodwaters are likely to disrupt travel, making some roads impassable and possibly isolating communities.

Heavy Rain Warning - Orange

• Period: 14hrs from 8pm Tue, 31 Jan - 10am Wed, 1 Feb
• Area: Auckland from Orewa southwards, and Great Barrier Island
• Forecast: Expect 50 to 80 mm of rain, especially north of the Harbour Bridge. Peak rates of 10 to 20 mm/h, but localised areas may see downpours of 25 to 40 mm/h. Thunderstorms are also possible.
• Impact: Heavy rain may cause streams and rivers to rise rapidly. Surface flooding and slips are also possible and driving conditions may be hazardous.

Strong Wind Watch

• Period: 12hrs from 6pm Tue, 31 Jan - 6am Wed, 1 Feb
• Area: Auckland
• Forecast: Northeast winds may approach severe gale in exposed places.

Wednesday 1st February - Rain, heavy at times, and thunderstorms possible. Rain easing to a few showers around midday, chance heavy in the west. Strong northeasterlies, easing during the morning.

Warnings are the same as above.

Thursday 2nd February - Mostly cloudy. Isolated showers developing in the morning, then rain at night. Northeasterlies.

Friday 3rd February - Rain, easing in the morning. Fresh northeasterlies.

Mangawhai region

Tuesday 31st January - Rain, heavy at times. Thunderstorms and downpours possible from afternoon. Northeasterlies becoming strong by midday, gusting 90 km/h.

Heavy Rain Warning - Red

• Period: 19hrs from 9am Tue, 31 Jan - 4am Wed, 1 Feb
• Area: Northland
• Forecast: Expect 100 to 140 mm of rain in the north and east, with lesser amounts in the west. However, localised areas may receive 140 to 220 mm. Peak rates of 10 to 20 mm/h, mainly in the north and east, but localised areas may see 25 to 40 mm/h, or possibly more. Thunderstorms are also possible, and a Severe Thunderstorm Watch is also in force.
• Impact: This rain is expected to cause dangerous river conditions and significant flooding. Slips and floodwaters are likely to disrupt travel, making some roads impassable and possibly isolating communities.

Severe Thunderstorm Watch

• Period: 14hrs from 2pm Tue, 31 Jan - 4am Wed, 1 Feb
• Area: Northland
• Forecast: A front is expected to bring heavy rain to Northland during Tuesday and overnight into Wednesday, as detailed in the Heavy Rain Warning. There is a moderate risk of SEVERE THUNDERSTORMS with this front, bringing localised downpours of 25 to 40 mm/h or possibly more. 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. Driving conditions will also be hazardous with surface flooding and poor visibility in heavy rain. Expect thunderstorms to ease from the north Tuesday evening and overnight.

Strong Wind Watch

• Period: 18hrs from 9am Tue, 31 Jan - 3am Wed, 1 Feb
• Area: Northland
• Forecast: Northeast winds may approach severe gale in exposed places.

Wednesday 1st Feb - Early rain, heavy at times and possibly thundery with downpours, then partly cloudy with a few showers. Northerlies. See warnings above.

Thursday 2nd February - Mostly cloudy. A few showers then rain at night. Northeasterlies.

Friday 3rd Feb - Rain, clearing later in the day to partly cloudy weather. Northeasterlies.