The National Hurricane Center began issuing storm surge maps for Isaias in the Atlantic basin on October 7, 2026, as the system carried a flooding threat along coastal areas. The center produced two distinct products throughout the event: a Potential Storm Surge Flooding Map and a Storm Surge Watch/Warning Map.
The first flooding map appeared at 04:14 UTC on October 7, when Isaias held tropical storm status. The center refreshed that map at 13:06 UTC, then added a Storm Surge Watch/Warning Map at 15:00 UTC. Two more updates followed later that day, at 16:07 UTC and 21:53 UTC, for the flooding map, and at 20:50 UTC for the watch/warning map.
By 21:53 UTC on October 7, the National Hurricane Center's map headlines reflected a change in classification: Isaias had become a hurricane. The center issued its first storm surge products under the hurricane designation at that time, with a watch/warning map following on October 8, 2026, at 02:54 UTC. A final flooding map update for Hurricane Isaias was published at 04:01 UTC on October 8.