The 5AM advisory from the National Hurricane Center:

At 500 AM EDT (0900 UTC), the center of Tropical Storm Ian was
located near latitude 14.7 North, longitude 73.5 West. Ian is moving
toward the west near 14 mph (22 km/h).  A westward to 
west-northwestward motion is expected through early Sunday.  A
turn toward the northwest is forecast late Sunday, followed by a
north-northwestward turn by late Monday.  On the forecast track,
the center of Ian is forecast to move across the central Caribbean
Sea today, pass southwest of Jamaica on Sunday, and pass near or
over the Cayman Islands Sunday night and early Monday.  Ian will
then approach western Cuba on Monday.

Maximum sustained winds have increased to near 45 mph (75 km/h) 
with higher gusts. Additional strengthening is forecast during the 
next few days, and Ian is expected to become a hurricane late 
Sunday or Sunday night.