Hurricane Nana was the sixteenth tropical system and fourteenth named storm of the hyperactive 2020 Atlantic Hurricane Season. The storm that would become Nana became a tropical depression after 15L, thus given the numerical identifier 16L. However, the depression strengthen to tropical storm status before 15L. Therefore, 15L received the later 'O' name and 16L received the 'N' name.
Hurricane Nana was a hurricane for all of 6 hours (likely less, but official storm reports are in 6-hour chunks) preceding its movement over Honduras, Belize, Guatemala, and Mexico.
The low level circulation dissipated over the rugged terrain of Central America. However, the mid-level low survived the crossing, entered the Pacific, and became Tropical Storm Julio.
Major Hurricane Laura was the thirteenth tropical system and twelfth named storm of the 2020 Atlantic hurricane season. Laura was the earliest forming twelfth storm in recorded history. When the storm became a tropical depression, it did so around the same time as another tropical depression formed (later Hurricane Marco). At one point, both storms were predicted to make simultaneous landfalls on the US Gulf states as category 1 hurricanes. Laura remained under hurricane strength until reaching the Gulf of Mexico. Upon entering those water, rapid intensification quickly created a category 4 monster of a storm.
Laura made landfall near Cameron, Louisiana, just 1 mbar / hPa above its peak lowest pressure and tied the 1856 Last Island Hurricane as the strongest (deepest low pressure) to hit the US state of Louisiana.
As of August 31st, Major Hurricane Laura is estimated to have caused US$8 billion in damages.
Peak: 150 MPH, 937 mbar / hPa.
Major Hurricane Iota was the thirty-first tropical system and thirtieth named storm of the hyperactive 2020 Atlantic hurricane season. With Iota, we are now two storms past the previous record set in 2005 with 43 days left in the year (as of my writing this on November 19th).
Iota began in the Caribbean when a low pressure system formed and quickly organized. Iota rapidly strengthened to the first category 5 storm of the season. Iota was also the latest forming cat 5 storm and makes it the first time there has been two major hurricanes in November. Major Hurricane Iota made landfall less than 15 miles south from where Major Hurricane Eta had made landfall just two weeks earlier.
Iota crossed Central America and entered the Pacific Ocean with barely any strength left. There was nearly a 0% chance it would redevelop in that basin.
Peak: 160 MPH, 917 mbar / hPa
Tropical Storm Theta was the thirtieth tropical system and the twenty-ninth named storm of the hyperactive 2020 Atlantic hurricane season. At 29 storms, this now bests the 2005 hurricane season as the most active. 2005 reached its last storm on December 30th.
Theta began as a area of low pressure that had detached from a front that had began dying out over the central Atlantic. Once the circulation had completely closed off, Subtropical Storm Theta was born. Never a threat to land and with very little chance of strengthening, Theta moved eastward over the Atlantic without much fanfare other than eventually transitioning to a fully tropical system.
Peak: 70 MPH, 989 mbar / hPa.
Subtropical Storm Alpha was the twenty-fourth tropical system and twenty-second named storm of the hyperactive 2020 Atlantic hurricane season. Alpha is the earliest forming twenty-second storm in recorded history, beating out 2005's Hurricane Wilma by 29 days. Alpha is also the eastern most developing tropical or subtropical storm in the Atlantic basin, beating out 1973's Tropical Storm Christine.
Alpha was also the third confirmed tropical or subtropical system to make landfall on mainland Europe, following an unnamed 1842 hurricane in Spain and 2005's Hurricane Vince. It was the first landfalling tropical or subtropical system in Portugal.
Subtropical Storm Alpha is also notable for heralding in the second time the Atlantic basin ran out of pre-defined names. Per the guidelines of the World Meteorological Organization, the Greek alphabet is used for names going forward.
Subtropical Storm Alpha formed at around 10ºW, an extreme and - as mentioned above - record breaking longitude. The storm gained organization just a short time before making landfall and so officially lasted for three NHC updates (18 hours).
Alpha spawned at least two tornadoes and caused extensive flooding.
Hurricane Sally was the nineteenth tropical system and the eighteenth named storm of the hyperactive 2020 Atlantic hurricane season. Sally is the earliest forming eighteenth storm on record beating the previous record set by Hurricane Stan in 2005 by 20 days.
Sally began in the Bahamas as an area of disturbance. As it crossed the extreme southern tip of Florida, Sally became a tropical storm. As Sally moved towards the northern Gulf, it quickly strengthened to a category 2 storm. However, slow movement began to limit the amount of warm water under the system as colder water was brought up from the deep (upwelling).
Peak: 105 MPH, 965 mbar / hPa.
Major Hurricane Eta was the twenty-ninth tropical system and the twenty-eighth named storm of the hyperactive 2020 Atlantic hurricane season. Eta was the earliest forming twenty-eighth storm on record beating Tropical Storm Zeta of 2005 by 59 days.
Eta was a long lived storm that began in the Caribbean. It strengthened rapidly to category 4 (and nearly 5) and made havoc over the Central American countries of Nicaragua, Honduras, Belize, Panama, Costa Rica, and El Savador. Eta's trip over the mountainous terrain of Central America nearly tore it apart. The storm curved northeastward briefly and impacted Jamaica and Cuba. Once back over water, Eta curved once again to the southwest briefly and stalled out just west of the western tip of Cuba. The storm then began its northeastward motion again and crossed Florida. Eta became extratropical just off the coast of the Carolinas.
Hurricane Isaias was the ninth storm of the 2020 Atlantic Hurricane season, and the earliest one on record. At this time, Isaias is responsible for 13 fatalities and an unknown amount of damages. Areas affected include West Africa, the Lesser Antilles, the Greater Antilles, the Bahamas, the entire East Coast of the United States, and Eastern Canada.
Peak: 85 MPH, 987 mbar /hPa.
Tropical Storm Dolly was the fourth named storm of the 2020 Atlantic hurricane season. Initially subtropical, Dolly briefly held tropical status for nearly 24-hours while the center of circulation was over the Gulf Stream. Upon leaving the stream, the storm weakened and its center was left exposed.
Peak: 45 MPH, 1002 mbar / hPa