Update 6pm Friday: Despite the lessening of a storm threat to Grand Cayman, Cayman’s National Hazard Management Executive council has decided to place all three islands under a tropical storm watch – starting at 10pm Friday.
According to local forecasts, Little Cayman and Cayman Brac can expect to receive up to three or four inches of rain between 7am Saturday and 7am Sunday as parts of Issac pass over eastern Cuba.
Grand Cayman can expect about half an inch of rain during the same period.
Small craft advisories will be in effect and seas will have wave heights of up to four to six feet during the period.
Earlier story: The tropical weather system known as Issac powered up to near hurricane strength Friday, but it also moved further away from the Cayman Islands threatening southern Haiti and eastern Cuba instead.
Over the course of Friday afternoon, Tropical Storm Issac made its expected turn to the northwest moving forward at a fairly brisk 16 miles per hour. It was packing 65-mile per hour maximum sustained winds and looked set to strike Haiti overnight Friday moving into Cuba sometime Saturday.
At 4pm local time, Issac was located about 100 miles south-southeast of Port Au Prince, Haiti.
The National Hurricane Centre put out a rare warning about storm forecast models on Friday morning.
“It is important not to focus on the exact track due to uncertainties in the initial location of the track forecast,” the NHC’s 8am advisory read. “Issac has a large area of tropical storm force winds associated with it.”
The 5pm eastern time advisory issued much the same warning about the storm, even though forecast models all seemed to be in agreement on where the storm would go for the next 48 hours.
According to the Cayman Islands Weather Service: “Tropical Storm Isaac does not pose an imminent threat to the Cayman Islands.Showers and cloudiness are expected over the Cayman area from late Friday evening as the outer bands of Tropical Storm Isaac move into the Northwest Caribbean.”