Forecasters Monday evening said a nearly stationary area of low pressure about 700 miles west-southwest of the Cape Verde island chain could become a tropical depression later this week.
The system still is thousands of miles from the U.S. mainland, and would not be a threat until next week, if ever.
In its 8 p.m. tropical weather update, the National Hurricane Center said the chance of formation in the next five days still was 70 percent, but upped the chance of formation in the next two days from 30 percent to 40 percent, and from low chances to medium.
“Gradual development of this system is likely,” hurricane center forecaster John Cangialosi said in an advisory. “The disturbance is expected to begin moving west-northwestward in a day or so, and it should continue moving in that direction through the remainder of the week.”