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Last Updated: Wednesday, 27 June 2007, 14:30 GMT 15:30 UK
Q&A: June floods
Flooding in Catcliffe, South Yorkshire
A further two inches of rain are expected to fall in some places

Flooding has been so extreme in some parts of the UK that the Army has been called in to lend assistance.

Meteorologist Nina Ridge from the BBC weather centre explains how and why heavy rainfall has created so much chaos.

WHAT HAS CAUSED THE EXTREME WEATHER?

The polar jet which steers our weather system is stuck further south than is usual for this time of year, so we are more open to low pressures.

Last week we saw intense thunderstorms, and on Monday a low-pressure weather front sat above the same parts of the country.

As a result, a month's worth of rain fell in 24 hours in some parts of the country.

HOW LONG WILL IT LAST?

The weather will stay unsettled, and there will be more rain over the next few days.

Our biggest concern is for Saturday and Sunday, when we predict some two inches of rain could fall over some places which have already seen heavy rainfall.

There is not a lot of time for the ground to dry out between now and then.

IS CLIMATE CHANGE TO BLAME?

A consequence of climate change is that we will see extreme weather patterns across the world.

Clearly, it is impossible to link climate change to any one event.

But there is no doubt that the globe is warming up and that at the same time we are witnessing severe weather across the planet.

WAS THE FLOODING UNEXPECTED?

We have seen extreme flooding over the past few years - but this has been exceptional.

The heavy rainfall had been forecast here in the weather centre.

As far as the flooding goes, there is an issue about why we are building on flood plains.

WHAT ROLE HAS 'RUN-OFF RAIN' PLAYED?

We saw a great deal of rainfall in a short space of time.

As a result, much of the ground in many parts of the country became saturated.

The rain has got to go somewhere and this has contributed to flooding.

IS THIS WEATHER NORMAL FOR THIS TIME OF YEAR?

June can be an unsettled month because we are in the changeover from Spring to Summer.

But this year it has been unusually wet.

For instance, Sheffield has seen its wettest month ever.






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