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Plenty more high pressure on the horizon

There has certainly been no shortage of high pressure systems this summer but unlike a year ago there have been some big rain makers in the mix.

WeatherWatch.co.nz says that for the rest of March a series of large highs will move in from the west. 

“There will be the continued dominance of high air pressure meaning mostly dry weather for the rest of March, but a few weak lows and fronts will be in the mix too, bringing some rain” says head weather analyst Philip Duncan.

This time last year high pressure remained steady over New Zealand while this year the highs are moving through at a faster rate.  “We’re seeing the weather patterns moving much faster this year compared to last, however we expect April to see wetter weather – just like 2010”.

Typically the months get wetter as we head towards winter and away from summer as more lows move in from the Southern Ocean and Tasman Sea.

Highs don’t always mean settled, sunny, weather however.  “The fast movement of these highs means that we’re not getting just the calming section in the middle – we’re also frequently getting the outer fringes which are often cloudy, windy and, in the South Island, can produce cool southerlies as they move in” says Mr Duncan.

– WeatherWatch.co.nz

– Image — Weather map for next Wednesday March 30th showing a large high moving in from Australia / ECMWF

Comments

Guest Steve on 21/03/2011 7:38pm

Hi Phil
Your comments regarding high pressure systems are very interesting as regards this summer. I’ve just checked our rainfall to date this year (2011) and see that we have received 561 mils. This is way ahead of any of our previous yearly starts. This latest rain has netted 45 mils. As you have commented plenty of dry, but I think balanced nicely by rainfall. Water tables still to be replenished yet though.
One question regarding the autumn equinox, is there a predictable, noticeable effect on weather as with the spring event with its winds?
Keep up the good work.

Cheers Steve

WW Forecast Team on 21/03/2011 10:17pm

Hi Steve – thanks for the feedback,

We notice once the Autumn equinox hits that we get more cold fronts from the Southern Ocean – it tends to make for windier weather south of about the lower North Island.  It’s not as noticeable as the Spring equinox but certainly we start seeing more hot and cold mixes in our weather from now on.

– WeatherWatch

Guest Steve on 22/03/2011 3:01am

Cheers Steve

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