Insured losses from devastating floods in northern England are estimated at £250-£325 million ($520-$676 million), and are likely to rise if predictions of more bad weather prove correct, according to PricewaterhouseCoopers (PWC) UK.

Preliminary estimates of the overall damage from Storm Desmond are £400-£500 million ($832 million to $1.04 billion).

Desmond has already caused more damage than 2009 floods that cost the economy £275 million ($572 million) and insurers £175 million ($364 million).

“Clearly these are initial estimates because there is still uncertainty as to the number of properties and businesses affected,” PWC UK General Insurance Leader Mohammad Khan said. “If the storm continues, the damage – and therefore the costs – could be significantly worse.”

Chancellor George Osborne has announced extra relief funding of £51 million ($107 million) for flood victims in Cumbria and Lancashire, boosting the Government’s total aid to more than £60 million ($125 million).

The funds include £10 million ($20.8 million) to repair damaged flood defences and to help property owners install new flood barriers and businesses reopen.

About 5000 homes in Lancashire and Cumbria were damaged by Desmond, which struck the region on December 4.

The Environment Agency has urged communities in the regions to remain vigilant amid predictions of more rain.

Desmond is the fourth named storm of the 2015/16 UK and Ireland windstorm season.