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Severe Frost Forecast


Severe Frost Forecast

MetService meteorologists are forecasting that severe frosts will be affecting parts of New Zealand and particularly the South Island this coming weekend and into next week.

"A large anticyclone is stalling over the South Island and light winds are forecast for an extended period", commented MetService Weather Ambassador, Bob McDavitt. "Many inland places are likely to have clear skies during some of the longest nights of the year, and this is the formula for severe frosts."

Frosts are considered severe when the grass-minimum temperature drops below minus six Celsius. This occurs when the overnight low air temperature is around minus two or cooler. Water in pipes exposed to such temperatures is liable to freeze and stress the pipe until it bursts. This damage can be averted by covering the exposed pipe with lagging or by allowing the water to keep moving.

McDavitt added that, in addition to the frosts, these chilly mornings with light winds may produce some fog problems. "These problems are here to stay until the anticyclone goes away, and that isn't likely over the South Island until late next week."


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