In Puerto Rico, public schools will be closed on Wednesday and public workers have been instructed to stay home, Vazquez said. While hurricanes can be unpredictable, meteorologists are estimating that New England will see minimal impact from Dorian.
Maximum sustained winds have increased to near 75 miles per hour (120 km/h) with higher gusts.
For Sebastian, watch the weather reports on Thursday. There is no obvious reason why it wouldn't strengthen steadily.
The governor is urging those who are traveling to Georgia's seacoast or to Florida to pay attention as Dorian approaches the Southeast.
It is expected to gather strength and could to grow into a risky Category 3 storm.
Then Dorian could get stronger - and set its sights on Florida.
Dorian'scone of probability suggests that the storm could move north of the Bahamas and make landfall in Florida.
The potential tracks for Tropical Storm Dorian. FLORIDA PUBLIC RADIO EMERGENCY NETWORK
Similarly, the various computer model forecasts for the intensity of the storm when it reaches the vicinity of the coast vary tremendously.
The forecast now says that because of conditions favorable for development, Dorian is expected to reach category 3 intensity before it makes landfall.
As always, forecasts are never precisely correct, so it won't be until Thursday, the earliest, before the potential impact on the US will be more certainly known.
A hurricane warning is now in effect in Vieques and Culebra in Puerto Rico as well as the USA and British Virgin Islands. But it still could dump four to 10 inches of rain in a matter of hours in parts of that island and the British and U.S. Virgin Islands.
Risky winds and heavy rain will continue in the Virgin Islands, Culbera, Vieques and portions of Puerto Rico.
Parts of the Bahamas, Florida and other parts of the southeastern US are expected to get hit with heavy rain later this week and into early next week.
"The threat of tropical storm or hurricane conditions, along with storm surge, in the northwestern Bahamas and along portions of the Florida east coast have increased", it added.
The uncertainty of the storm's strength remains "higher than usual" due to the large spread of the storm on computer models, it said.
For tropical storm Dorian there are advisories in place as it tracks ever closer to land. The path shift also means residents in Northern Florida, especially Jacksonville, will have to contend with the winds, heavy rain and risky tides.
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