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Tropical Cyclones ReportSeptember 2018
North Atlantic
Storm Type | September 2018 | September 1981-2010 Average | Record Most for September Period of Record: 1851-2018 |
---|---|---|---|
Tropical Storm (Winds > 39 mph) |
7 | 4.0 | 8 (2002, 2007, 2010) |
Hurricane (Winds > 74 mph) |
4 | 2.6 |
5 (1955, 1969, 1981, 1998, 2000, 2005, 2017) |
Major Hurricane (Winds > 111 mph) |
1 | 1.3 | 4 (1953, 1961, 2017) |
Name | Dates of winds >39 mph |
Maximum Sustained Winds |
Minimum Central Pressure |
Landfall |
---|---|---|---|---|
Hurricane Florence (Cat. 4) | August 31stโSeptember 17th | 140 mph | 939 mb | Wrightsville Beach, NC |
Tropical Storm Gordon | September 3rdโ8th | 70 mph | 997 mb | Near Alabama/Mississippi border |
Hurricane Helene (Cat. 2) | September 7thโ16th | 110 mph | 966 mb | N/A โ impacted parts of the British Isles |
Hurricane Isaac (Cat. 1) | September 7thโ15th | 75 mph | 993 mb | N/A โ impacted Windward Islands |
Tropical Storm Joyce | September 12thโ19th | 50 mph | 997 mb | N/A |
Tropical Storm Kirk | September 22ndโ29th | 60 mph | 998 mb | N/A |
Hurricane Leslie (Cat. 1) | September 25thโ on-going at time of publication | 90 mph | 969 mb | N/A |
Significant Events
Hurricane Florence was a long-lived tropical cyclone that brought devastating flooding to the Carolinas in September 2018. The storm became a tropical depression on August 31st off the African Coast. The storm moved slowly to the West and strengthened along its route, reaching Cat. 4 hurricane strength on September 4th. Florence encountered high wind shear and weakened back to tropical storm status. The storm eventually entered a favorable environment with warm sea surface temperatures and low wind shear and re-strengthened into a Cat. 4 hurricane, reaching its peak intensity with winds of 138 mph. As the storm slowly drifted to towards the Carolina Coast it underwent and Eye Wall Replacement Cycle and entrained dry air into the circulation, causing it to weaken to a Cat. 1 hurricane before making landfall on September 14th with maximum sustained winds of 90 mph near Wrightsville Beach, North Carolina.
Florence moved extremely slowly after making landfall, with a forward motion between 3 and 5 mph, and at points moving nearly parallel to the coast. This caused a prolonged surge event along the Carolina coast and extremely high rainfall totals. Numerous locations observed over 30 inches of precipitation from the storm with rivers across the eastern Carolinas cresting at new record high levels. The highest rainfall total was reported near Elizabethtown, NC with a total of 35.93 inches. Many locations in the region were already on track to have their wettest year on record before Florence, so the precipitation fell on saturated soils. Some locations observed flooding that was classified as a 1-in 1,000 year flood event. Wind gusts over 105 mph were also observed along the coast adding to the devastation. The flood event was prolonged and lasted several weeks as the copious amounts of water that fell across inland areas made their way through the rivers to the ocean. One of the hardest hit communities was New Bern, North Carolina where the heavy rains and prolonged storm surge caused water to rise and inundate large parts of the city. Over 800,000 customers lost power during the event. At least 34 tornadoes were also spawned by the storm as it moved inland and eventually into the Mid-Atlantic with several tornadoes across the Richmond, Virginia metro area. There were at least 51 fatalities blamed on the storm and damages are expected to easily exceed $1 billion.
East Pacific
Storm Type | September 2018 | September 1981-2010 Average | Record Most for September Period of Record: 1949-2018 |
---|---|---|---|
Tropical Storm (Winds >39 mph) |
4 | 3.6 | 7 (2016) |
Hurricane (Winds >74 mph) |
3 | 2.2 |
6 (1992 and 2016) |
Major Hurricane (Winds >111 mph) |
3 | 1.1 | 4 (1972, 1993) |
Name | Dates of winds >39 mph |
Maximum Sustained Winds |
Minimum Central Pressure |
Landfall |
---|---|---|---|---|
Hurricane Norman (Cat. 4) | August 28thโ September 9th | 150 mph | 937 mb | N/A |
Hurricane Olivia (Cat. 4) | September 1stโ14th | 130 mph | 948 mb | Maui and Lanai, Hawaii |
Tropical Storm Paul | September 8thโ 12th | 45 mph | 1002 mb | N/A |
Hurricane Rosa (Cat. 4) | September 25th โ October 2nd | 145 mph | 940 mb | Along Baja California, Mexico |