page_title: Timeline of the 1990 Atlantic hurricane season
section_title: September
hierarchical_section_title: Timeline of the 1990 Atlantic hurricane season / Timeline of storms / September
caption_attribution_description: English: Track map of Tropical Depression Eleven of the 1990 Atlantic hurricane season. The points show the location of the storm at 6-hour intervals. The colour represents the storm's maximum sustained wind speeds as classified in the Saffir–Simpson scale (see below), and the shape of the data points represent the nature of the storm, according to the legend below. Saffir–Simpson scale Tropical depression≤38 mph≤62 km/h Category 3111–129 mph178–208 km/h Tropical storm39–73 mph63–118 km/h Category 4130–156 mph209–251 km/h Category 174–95 mph119–153 km/h Category 5≥157 mph≥252 km/h Category 296–110 mph154–177 km/h Unknown Storm type Tropical cyclone Subtropical cyclone Extratropical cyclone / Remnant low / Tropical disturbance / Monsoon depression
context_page_description: The 1990 Atlantic hurricane season featured the most named storms of any hurricane season at the time. During the season, 14 tropical cyclones in the Atlantic Ocean became named storms. Although Tropical Depression One formed on May 24, the season officially began on June 1; it ended on November 30, dates that conventionally delimit the period of each year when most tropical cyclones develop in the Atlantic basin. The season's final storm, Hurricane Nana, dissipated on October 21.
  The season produced 16 tropical depressions, of which 14 intensified into tropical storms, 8 became hurricanes, and 1 became a major hurricane. Although the season had the highest number of named storms at the time, it featured only two notable storms, primarily because many of the tropical cyclones remained either weak or at sea. The two most significant storms of the season, in terms of damage and loss of life, were Hurricane Diana and Tropical Storm Marco. However, the strongest tropical cyclone of the season was Hurricane Gustav.
context_section_description: September 1
  0000 UTC (8:00 p.m. EDT August 31) – Hurricane Gustav weakens to a Category 2 hurricane.
  1800 UTC (2:00 p.m. EDT) – Hurricane Gustav weakens to a Category 1 hurricane.
  September 2
  1800 UTC (2:00 p.m. EDT) – Hurricane Gustav weakens to a tropical storm.
  September 3
  0600 UTC (2:00 a.m. EDT) – Tropical Storm Gustav transitions into an extratropical storm while located east of Newfoundland.
  September 4
  0000 UTC (8:00 p.m. EDT September 3) – Tropical Depression Ten develops southwest of Cape Verde.
  September 5
  1200 UTC (8:00 a.m. EDT) – Tropical Depression Ten intensifies into Tropical Storm Isidore.
  September 7
  0000 UTC (8:00 p.m. EDT September 6) – Tropical Storm Isidore intensifies into a Category 1 hurricane.
  1200 UTC (8:00 a.m. EDT) – Hurricane Isidore intensifies into a Category 2 hurricane. Simultaneously, the storm attains its peak intensity with winds of 100 mph (165 km/h) and a minimum barometric pressure of 978 mbar (hPa; 28.88 inHg).
  1800 UTC (2:00 p.m. EDT) – Hurricane Isidore weakens to a Category 1 hurricane.
  September 8
  1800 UTC (2:00 p.m. EDT) – Hurricane Isidore weakens to a tropical storm.
  September 9
  1800 UTC (2:00 p.m. EDT) – Tropical Storm Isidore re-intensifies into a Category 1 hurricane.
  September 16
  0600 UTC (2:00 a.m. EDT) – Hurricane Isidore weakens to a tropical storm.
  September 17
  1200 UTC (8:00 a.m. EDT) – Tropical Storm Isidore transitions into an extratropical cyclone while located a few hundred miles east of Cape Race.
  September 18
  0600 UTC (2:00 a.m. EDT) – Tropical Depression Eleven develops about midway between the Lesser Antilles and Africa.
  September 20
  1800 UTC (2:00 p.m. EDT) – Tropical Depression Eleven attains its peak intensity with winds of 35 mph (55 km/h) and a minimum barometric pressure of 1003 mbar (hPa; 29.62 inHg).
  September 21
  0600 UTC (2:00 a.m. EDT) – Tropical Depression Twelve develops west of Cape Verde.
  September 24
  1200 UTC (8:00 a.m. EDT) – Tropical Depression Twelve intensifies into Tropical Storm Josephine.
  September 26
  0600 UTC (2:00 a.m. EDT) – Tropical Storm Josephine weakens to a tropical depression.
  September 27
  1200 UTC (8:00 a.m. EDT) – Tropical Depression Eleven dissipates well north-northeast of the Lesser Antilles.
caption: The path of the slow-moving Tropical Depression Eleven; Note: movement was slow enough that one dot represents 24 hours, rather than 6 hours
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