The National Hurricane Center upgraded Kirk's chances this morning as the cluster of thunderstorms moves quickly west at about 25 miles per hour.
The tropical wave associated with the remnants of Tropical Depression Kirk has regenerated into Tropical Storm Kirk.
A tropical storm warning, meaning that tropical storm conditions were likely over the next 36 hours, was in effect for islands along the eastern wall of the Caribbean including Barbados, St. Lucia, Dominica, Martinique and Guadaloupe.
There are hurricane-force winds extending outward from Rosa up to 25 miles from the centre, with tropical-storm-force winds extending up to 80 miles.
The most serious threat from Kirk is expected to be from rainfall.
At 3 a.m. today, the center of Tropical Storm Rosa was moving west-northwest near 10 miles per hour, and this general motion is forecast to continue for the next two to three days.
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Why? Wind shear. Shear, which refers to varying wind speeds in the atmosphere, is bad for tropical systems because it can weaken or kill them.
The government of France has issued a Tropical Storm Warning for Guadeloupe and Martinique. Tropical storm conditions are expected to first reach the warning area by Thursday afternoon, making outside preparations hard or unsafe.
On its current track, Kirk "is expected to approach Barbados and the northern Windward Islands Thursday afternoon and move into the eastern Caribbean Sea by Friday morning", NHC's latest advisory said. It is expected to strengthen rapidly and convert into a major hurricane by tomorrow.
Tropical storm conditions are possible within the watch area by Thursday afternoon.
Finally, Post-Tropical Cyclone Leslie, in the central Atlantic a few hundred miles southwest of Portugal's Azores Islands, has a 90 percent chance of becoming organized again over the next five days. These rains may produce life-threatening flash floods and mudslides.