The Dominican Republic was also on alert for heavy rain and winds Haiti is still struggling to recover from the devastating earthquake in January 2010.
President Michel Martelly took office in May but has so far been unable to form a government, complicating aid and reconstruction efforts.
Tropical Storm Emily has been bringing rain and strong winds to the Dominican Republic and Haiti, which share the island of Hispaniola.
At 0900 GMT on Thursday, Emily was 100 miles (160km) south-south-east of the Haitian capital, Port-au-Prince, the National Hurricane Center reported.
While maximum winds were put at 85km/h (50mph), the main threat is from torrential downpours.
"This storm has a lot of heavy rainfall with it," meteorologist Diana Goeller told the Associated Press.
Forecasters said six to 12 inches (15-30cm) of rain could fall, but with up to 20 inches possible in some regions.
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Tropical storm Emily hits Caribbean
"People living in unsafe housing will be the worst affected if flooding hits," Harry Donsbach from charity World Vision told AFP.
"Landslides are of courses a threat, but even simply heavy rain has the potential to worsen the volatile sanitation conditions in camps, which, with cholera still prevalent in Haiti, is a serious concern."
According to the International Office of Migration, some 634,000 Haitians still live in camps, although other estimates of what is a necessarily fluctuating population put the figure at 375,000.
On Tuesday, Haitian lawmakers voted against Mr Martelly's new choice of prime minister, Bernard Gousse, following their rejection in June of his first pick, Daniel-Gerard Rouzier.
President Martelly needs a prime minister in order to assemble a government that can work with international agencies involved in the task of rebuilding after the 2010 quake.
The lack of an administration is also hampering planning for potential disasters.
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