Invest 91L
Central Subtropical Atlantic (AL91): A surface trough of low pressure located several hundred miles east of Bermuda continues to produce an area of disorganized showers and thunderstorms.
What this means
Central Subtropical Atlantic (AL91): A surface trough of low pressure located several hundred miles east of Bermuda continues to produce an area of disorganized showers and thunderstorms. Recent satellite-derived wind data indicates the system is producing winds of 30-35 mph and has a sharp wind shift, though lacks a closed circulation due to its fast forward motion. Environmental conditions appear somewhat favorable for additional development of this system, especially as its forward motion slows down. A tropical depression could form by the early to mid portion of this week as the system initially moves northward before turning eastward tomorrow over the central Subtropical Atlantic.
Official resources
Last updated 9/27/2026, 8:00:15 PM · Latest advisory 9/27/2026, 5:25:38 PM
