The Consortium had been following a weather system forming in the Atlantic Ocean over the last few days, but another system, which appears to be better organized than the one before it, is gaining strength and is heading west or west-northwest towards the Leeward islands, according to the National Hurricane Center (N.H.C.)
Both systems are expected to develop, the first into a tropical depression over the course of 48 hours, and the second, more organized system into a depression or even tropical storm today.
According to N.H.C., shower and thunderstorm activity associated with the first system, described as an area of low pressure centered about 500 miles west of the Cabo Verde Islands, has become a little more concentrated over the past couple of hours, but recent satellite data show that this system is still fairly broad and elongated. N.H.C. said environmental conditions appear conducive for development, and a tropical depression is expected to form within the next day or so while the system moves slowly westward across the tropical Atlantic Ocean.
Formation chance within the next 48 hours is high at 90 percent.
N.H.C. said showers and thunderstorms have increased in association with the second system — described as a tropical wave and accompanying low pressure system near the west coast of Africa.
Environmental conditions appear conducive for development, and a tropical depression or tropical storm is likely to form later today or over the weekend while the wave moves westward or west-northwestward over the far eastern tropical Atlantic Ocean.
Interests in the Cabo Verde Islands should monitor the progress of this system, and advisories on a potential tropical cyclone or tropical depression could be issued later today, N.H.C. said.