Storm-tide red-alert days 2017

Storm-tide red alerts are the highest high tide (also known as king tidesdates that Emergency Managers and Coastal Hazard Managers should write in their diaries and keep an eye on adverse weather (low barometric pressure, onshore winds), river levels and sea conditions (waves and swell).

The dates below are averaged across New Zealand. See tide forecasts for specific locations.

The following table shows the 2017 dates of the highest high tide "red alert" dates, and the lowest high tide "carefree" dates. It also includes dates when the moon's orbit brings it closest to [perigee] and furthest from [apogee] the earth.

Red-alert dates - highest high tides
[actual lunar perigee date]

Carefree dates - lowest high tides
[actual lunar apogee date]

10–15 January  [10 Jan]

20–22 February  [19 Feb]

10–13 February  [7 Feb]

21–23 March  [19 Mar]

28 February, 1–2 March [3 Mar]

 

29–31 March, 1–2 April [31 Mar]

20–21 April  [15 Apr]

26–30 April, 1 May [28 Apr]

 

25–30 May  [26 May]*

 

23–28 June  [23 Jun]

 

22–26 July  [22 Jul]

 

21–23 August  [19 Aug]

31 August, 1 September  [30 Aug]

 

28–30 September, 1 October [27 Sep]

7–9 October  [9 Oct]

27–30 October  [25 Oct]

4–10 November  [6 Nov]

 

4–10 December  [4 Dec]

 

Visual representation of this calendar:

red_alert2017_ALLNZ.png

2017 calendar of red alert high tide dates.

There is a printable version of the 2017 calendar available for download [PDF 250KB].

Regional red alert days

Red alert tide days are available for different regions throughout New Zealand. 

Download the 2017 red alert calendar for west Auckland [215 KB PDF]

Download the 2017 red alert calendar for east Auckland [215 KB PDF]

Download the 2017 red alert calendar for Bay of Plenty [215 KB PDF]

Download the 2017 red alert calendar for Nelson-Tasman [215 KB PDF]

Download the 2017 red alert calendar for West Coast (South Island) [215 KB PDF]

Download the 2017 red alert calendar for Christchurch [215 KB PDF]

Download the 2017 red alert calendar for Dunedin [215 KB PDF]

Further information

High perigean-spring tides, colloquially known as "king tides", peak 1–2 days after New or Full Moon when Moon is in its perigee (i.e. when it is closest to the Earth during its 27½ day elliptical circuit around the Earth), but dates of highest tides vary around New Zealand.

In 2017, the Moon's closest perigee occurs on 26 May and coincides exactly with a New Moon, with next closest on 4 December (Full Moon). The year's highest high tides will occur in March to July and November to December.

For the year 2017, "red-alert" dates cluster around very high tides (perigean-spring tides) that peak 1–2 days after New or Full Moon when Moon is in its perigee and "carefree" dates cluster around lower high tides after First or Third Quarter when Moon is close to its apogee. 

Times for perigee, apogee and New and Full Moon in UTC (add 12 hours for NZST). 

 

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