In focus: Storms that stall or move at a snail's pace near the coastline pile up water and prolong the coastal flooding potential. In addition, large battering waves over a longer period can worsen damage to the coastline, including severe beach erosion. This is because the winds blow onshore for a longer period.

Barbara has weakened down to a tropical storm. At the same time, the National Hurricane Center continues to track Tropical Storm Cosme and another area of low pressure that could develop into a system.