US Gulf Coast braced for possible new hurricane

Tropical Storm Sally is expected to bring dangerous weather conditions including risk of flooding (Alyssa Newton/The Sun Herald/AP)

Storm-weary residents are preparing for a new weather onslaught as Tropical Storm Sally heads towards the US Gulf Coast.

Forecasters predicted it will become a hurricane by landfall and said the biggest threat is flooding, with as much as 2ft of rain falling in some areas.