|2017 Atlantic hurricane season (Jarrell)|
Season summary map
|First system formed||June 19, 2017|
|Last system dissipated||Season ongoing|
|• Maximum winds||
180 mph (290 km/h)|
|• Lowest pressure||917 mbar (hPa; 27.08 inHg)|
|Total damage||$1.35 billion (2017 USD)|
The 2017 Atlantic hurricane season is an ongoing event in the annual formation of tropical cyclones in the Atlantic basin. The season officially began on June 1, and will end on November 30, 2017. These dates historically describe the period of year when most tropical cyclones form in the Atlantic basin and are adopted by convention. However, the formation of tropical cyclones is possible at any time of the year.
Breaking the trend that had been seen in the previous two seasons, there was no formation of a tropical cyclone before the official start of the season. However, in mid-June, Hurricane Audrey became the second-place holder for the earliest major hurricane to develop in a season; only behind Hurricane Alma of 1966, which reached category 3 intensity on June 8. Audrey struck the state of Louisiana shortly after reaching its peak strength, becoming the first tropical cyclone to strike the state since Hurricane Isaac in 2012.
|Category 3 tropical cyclone (NHC)|
|Duration||June 19 – June 24|
|Intensity|| 185 km/h (115 mph) (1-min) |
954 hPa (mbar)
In mid-June, a tropical disturbance within the Intertropical Convergence Zone (ITCZ) was first observed near Trinidad and Tobago. The disturbance later reached the Caribbean Sea and developed into a tropical depression on June 19. While heading north-northwestward, the depression intensified and was upgraded to Tropical Storm Audrey the next day. Thereafter, Audrey gradually strengthened and became a hurricane on June 21. Further strengthening continued into June 23 as Audrey neared the Gulf Coast, where it ultimately became a category 3 hurricane with peak winds of 115 mph (185 km/h) just before landfall at Grand Chenier, Louisiana shortly after midnight. The storm modestly weakened upon moving inland, falling to category 1 intensity just hours following its landfall; and later to tropical storm intensity a few hours after that. By noon on June 24, Audrey had weakened to a tropical depression and was later absorbed by a frontal system over Missouri that same evening.
The worst of the damage was confined to relatively rural sections of Louisiana and Texas coastline, with over 8 inches (203.2 mm) of rainfall and a storm surge of 12 feet (3.7 m), caused over $1.15 billion (2017 USD) in damage. A total of 237,000 people lost power, and oil rigs offshore were shut down for up to a week. 7 people were killed by the storm during its existence; all within Louisiana.
Tropical Depression Two
|Tropical depression (NHC)|
|Duration||July 6 – July 9|
|Intensity|| 65 km/h (40 mph) (1-min) |
1,007 hPa (mbar)
A tropical wave emerged off the coast of Africa on June 23, and no significant development occurred until it became Tropical Depression Two in the western Gulf of Mexico on July 6. On its first advisory, a tropical storm watch was issued for from Baffin Bay, Texas southward to Tampico, Tamaulipas. Nearing the coast of Mexico, the depression attained its peak intensity with winds of 35 mph (55 km/h) and a minimum pressure of 1,007 mbar (29.7 inHg). Failing to intensify further, Tropical Depression Two made landfall near La Pesca, Tamaulipas, Mexico on July 7. The National Hurricane Center issued the final advisory on July 8, although the circulation persisted until July 9 southwest of Texas. The depression had only minor impacts in Mexico and Texas, other than rainfall. Precipitation was heaviest in San Luis Potosí, where the rainfall peaked at 12 in (304.8 mm) in Ciudad del Maíz, Mexico.
Tropical Storm Bill
|Tropical storm (NHC)|
|Duration||July 19 – July 24|
|Intensity|| 75 km/h (45 mph) (1-min) |
1,000 hPa (mbar)
The third tropical depression of the season developed on July 19 from a tropical wave east of the Lesser Antilles. The depression slowly intensified, and was eventually upgraded to Tropical Storm Bill after it crossed Barbados late on July 21. Tropical Storm Bill crossed the Windward Islands chain, and it was noted that the storm made landfall on Saint Vincent. Emerging into the Caribbean Sea, Bill maintained tropical storm intensity through July 22 as it moved west. Wind shear began increasing over Bill, and a weakening trend began. As Bill headed further into the Caribbean Sea, it significantly weakened and was downgraded to a tropical depression on July 23. By noon on the next day, Air Force reconnaissance and satellite imagery did not show a low-level circulation, indicating that Bill had degenerated into open tropical wave 170.00 mi (273.58 km) south of Jacmel, Haiti.
Shortly before Bill was upgraded to a tropical storm, a tropical storm warning was issued for Martinique, Saint Lucia, and the Grenadines on July 21. About 24 hours later, all of the warnings were discontinued. As Bill headed further into the Caribbean Sea, tropical storm watches were issued for Hispaniola and Puerto Rico on July 22. All of the tropical storm watches and later warnings were discontinued after Bill weakened to a tropical depression. After Bill made landfall on Saint Vincent, several landslides occurred, and electrical and water services were significantly disrupted. Bill caused damage to two factories, a church, and hundreds of houses. Damage was also reported on Saint Lucia, where hundreds of buildings were damaged, electricity and telephone service was disrupted, and crops were affected as well. Wind gusts on the island of Saint Lucia reportedly reached 35 mph (56 km/h).
|Category 5 tropical cyclone (NHC)|
|Duration||August 15 – August 27|
|Intensity|| 335 km/h (205 mph) (1-min) |
917 hPa (mbar)
A tropical wave moved off the coast of Africa on August 13, and organized into Tropical Depression Four on August 15 while located about 200 miles west of Cape Verde. It moved to the west-northwest, and strengthened into Tropical Storm Cleo on August 16. A trough of low pressure positioned to the southwest of Cleo created an environment with little vertical shear and well-defined outflow. The storm quickly intensified, and became a hurricane on August 19. It bypassed the Lesser Antilles completely, and turned west in response to a building high pressure system to the north. Cleo rapidly intensified under ideal conditions for development, and on August 21 the hurricane peaked with winds of 180 mph (290 km/h). It crossed the Bahamas at that intensity, weakened slightly, and re-intensified to a 165 mph (270 km/h) Category 5 hurricane before making landfall near Homestead, Florida. It weakened slightly over the state to a 130 mph (209 km/h) hurricane, but restrengthened to a 150 mph (241 km/h) hurricane over the Gulf of Mexico. Cleo crossed the Gulf throughout August 22 and 23, and curved to the north before making landfall as a 145 mph (233 km/h) category 4 hurricane after midnight on August 24. It turned northeastward, weakening as it continued further inland; degenerating to a tropical depression by the late afternoon on August 25. The storm continued to move track through land, and eventually dissipated over Quebec, Canada on August 27.
In the Bahamas, Cleo brought high tides, hurricane-force winds, and tornadoes, which caused significant damage in the archipelago, especially on Staniel Cay. At least 500 houses were destroyed and left damage to the transport, communications, water, sanitation, agriculture, and fishing sectors. Overall, Cleo caused seven fatalities and $265 million in damage in the Bahamas. Throughout the southern portions of Florida, Cleo brought very high winds; a wind gust of 177 mph (282 km/h) was reported at a house in Perrine, Florida. High winds caused catastrophic damage in Florida, especially in Miami-Dade County, where approximately 200,000 houses were either severely damaged or destroyed. In the Everglades, 70,000 acres (280 km2) of trees were knocked down and about 182 million fish were killed. Rainfall was moderate, due to the storm's fast motion, peaking at 10.28 in (261 mm) in eastern Miami-Dade County. Significant damage to oil platforms was reported, with one company losing 13 platforms, had 104 structures damaged, and five drilling wells blown off course. In Texas, Cleo produced hurricane-force winds along its path, with numerous structures being heavily damaged or destroyed, boats were tossed or capsized, power poles were bent or snapped, and trees were downed. As debris covered roadways and cellphone service was compromised, communication to the hardest-hit locales was severed. Eleven fatalities were reported in Texas. The storm spawned at least 28 tornadoes, primarily in Texas and Oklahoma. Overall, Cleo caused 64 fatalities and $68 billion (2017 USD) in damage, making it the third costliest hurricane in U.S. history, behind only Hurricane Sandy in 2012, and Hurricane Katrina in 2005.
|Category 4 tropical cyclone (NHC)|
|Duration||August 31 – September 6|
|Intensity|| 240 km/h (150 mph) (1-min) |
941 hPa (mbar)
|Category 4 tropical cyclone (NHC)|
|Duration||September 10 – September 19|
|Intensity||285 km/h (180 mph) (1-min) 920 hPa (mbar)|
Tropical Storm Flora
|Tropical storm (NHC)|
|Duration||September 16 – September 22|
|Intensity|| 130 km/h (80 mph) (1-min) |
984 hPa (mbar)
This is a table of all the storms that have formed in the 2017 Atlantic hurricane season. It includes their duration, names, landfall(s), denoted in parentheses, damages, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but were still related to that storm. Damage and deaths include totals while the storm was extratropical, a wave, or a low, and all the damage figures are in 2017 USD.
|Saffir-Simpson hurricane category scale|
|Dates active||Storm category
at peak intensity
|Audrey||June 19 - June 24||Category 3 hurricane||115 (185)||954||Yucatán Peninsula, Southeastern United States, Texas||1,150||7|
|Two||July 6 - July 9||Tropical depression||35 (55)||1013||Mexico (Veracruz)||Minimal||None|
|Bill||July 18 - July 21||Tropical storm||50 (85)||994||Lesser Antilles||0.2||None|
|Cleo||August 15 - August 26||Category 5 hurricane||180 (290)||917|| Bahamas, Southeastern United States (Florida),
Gulf Coast of the United States (Texas), Midwestern United States, Mid-Atlantic states, Quebec
|4 cyclones|| |