US forecasters have issued hurricane warnings for parts of the Texan and Mexican coasts as Tropical Storm Dolly moves across the Gulf of Mexico.
A warning is in effect from Brownsville to Port O'Connor in Texas and along Mexico's north-east coast from Rio San Fernando north to the US border.
Hurricane conditions could be expected within the next 24 hours, the National Hurricane Center in Miami said.
Dolly is expected to reach land later on Tuesday or early Wednesday.
At 0900 GMT on Tuesday the centre of Dolly was located about 295 miles (475km) south-east of Brownsville, the National Hurricane Center said.
Maximum sustained winds were close to 60mph (95km/h).
"Dolly is expected to become a hurricane prior to landfall," the NHC said.
Dolly drenched popular tourist resorts on Mexico's Yucatan Peninsula at the weekend but caused no damage.
The governor of Texas, Rick Perry, has put 1,200 National Guard troops and other emergency crews on alert. The NHC has forecast that this year's hurricane season, which runs until November, could be especially active with up to nine hurricanes and 12 tropical storms.
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BBC NEWS | World | Americas | Storm heads to Texas and Mexico