’Once in a Hundred Year’ Storm Pounds Christchurch, New Zealand

By: Christopher C. Burt , 8:24 PM GMT on March 07, 2014

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’Once in a Hundred Year’ Storm Pounds Christchurch, New Zealand

A powerful extra-tropical storm sideswiped the coast of New Zealand’s South Island bringing gales and flooding to the city of Christchurch and the heaviest rainfall seen in almost 40 years.



A satellite image of the powerful storm swirling off the coast of New Zealand’s South Island on March 4th. NASA image.

The powerful storm pounded the Christchurch area between March 3-5 with wind gusts up to 119 km/h (74 mph) and rainfall of 151.6 mm (5.97”) as officially measured at Christchurch’s weather station. Of this amount 100 mm (3.94”) fell in just a single 24-hour period on March 4-5. The suburb of Lytelton received 160 mm (6.30”) in 24 hours and other suburbs reported storm totals of 170 mm (6.70”). The normal monthly rainfall for Christchurch in March is just 45 mm (1.77”).



New Zealand rainfall totals for the week ending March 7th. Christchurch is located next to the small peninsula jutting off the east coast of the South Island. As one can see, the heavy rainfall from the storm of March 3-5 was pretty well confined to that area. Map from NIWA, New Zealand’s climate agency.

Hundreds of homes and business’s were flooded and 5000 customers lost power in the city and suburbs (Christchurch’s population is around 360,000). The worst affected suburbs were St. Albans, Avondale, New Brighton, and Woolston.



Alternative transport is used to navigate the flooded streets of Heathcote Valley, a suburb just southeast of Christchurch and near Lytelton where the heaviest rainfall occurred. Photo by Deon Swiggs.

An earthquake devastated Christchurch just three years ago on February 22, 2011 that resulted in the deaths of 185. Apparently some of the city’s streets dropped 50 cm (20”) during the quake and this, some residents claim, has exacerbated some of the recent flooding in some neighborhoods.

Christopher C. Burt
Weather Historian

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8. mark058
9:51 AM GMT on March 15, 2014
Also the most Lytelton received in 24 hours was 96mm not 160.
The 160mm fell over 48 hours.

http://www.metservice.com/towns-cities/christchur ch/port-hills
Member Since: June 11, 2008 Posts: 0 Comments: 1
7. mark058
9:46 AM GMT on March 15, 2014
This was not an extra-tropical storm as it come from the southern ocean You can see this from the press weather maps dated 4th of march.
Christchurch NIWA weather station only recorded 80.8mm of rain over 3 days and the most in 24 hours 42.2mm.

Which Christchurch station are you talking about here as in the city their are two.
Member Since: June 11, 2008 Posts: 0 Comments: 1
6. WunderAlertBot (Admin)
9:10 PM GMT on March 10, 2014
weatherhistorian has created a new entry.
5. terstorm
11:59 AM GMT on March 10, 2014
it's true, quite a bit of Christchurch subsided during the recent quakes, particulary on the east side of the city and its suburbs near the ocean.

http://www.stuff.co.nz/the-press/news/the-east/95 90411/Subsidence-a-worry-for-citys-residents
Member Since: October 11, 2005 Posts: 0 Comments: 27
4. ColoradoBob1
2:34 PM GMT on March 08, 2014
Aqua/MODIS
2014/065
03/06/2014
02:35 UTC


Sediment near Christchurch, New Zealand


Link
Member Since: August 13, 2010 Posts: 0 Comments: 2280
3. BaltimoreBrian
2:52 AM GMT on March 08, 2014
How extraordinary! Christchurch, NZ averages less than 25" of precipitation a year. They're on the lee side of the Southern Alps.
Member Since: August 9, 2011 Posts: 26 Comments: 8558
2. Christopher C. Burt , Weather Historian
10:34 PM GMT on March 07, 2014
Thanks for the cx! Fixed.

Quoting 1. DataPilot:
It surprises me that New Zealand is getting hit by such a massive extratropical storm in March. Now that my curiosity is piqued, I need to go read about the climate of New Zealand....

(psst - I think you meant "exacerbated", not "exasperated")
Member Since: February 15, 2006 Posts: 291 Comments: 276
1. DataPilot
8:45 PM GMT on March 07, 2014
It surprises me that New Zealand is getting hit by such a massive extratropical storm in March. Now that my curiosity is piqued, I need to go read about the climate of New Zealand....

(psst - I think you meant "exacerbated", not "exasperated")
Member Since: January 5, 2009 Posts: 11 Comments: 1266

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About weatherhistorian

Christopher C. Burt is the author of 'Extreme Weather; A Guide and Record Book'. He studied meteorology at the Univ. of Wisconsin-Madison.