BAA incompetent liars?

The Telegraph reports with some glee that:

Gatwick Airport was closed for several ours due to snow, as it was disclosed it has opted out of a £1,000 a month weather forecasting service from the Met Office.

There were also reports that BAA had used the wrong chemical to de-ice the runway, but this was denied by the airport operator.

...

However BAA attributed the closure of the runway to an "unforecast snow flurry and a sudden dip in the temperature".

The Met Office said last night that it had predicted snow, ice and a drop in temperature and its customers at Gatwick encountered no problems. BAA insisted it had the same information from its own supplier but was unable to keep the runway open.

So the snow was "unforecast" and predicted at the same time?