最大の類似点は、名前付きの嵐の数が多かったことです。. ザ・ 2021 season became only the third in history to use all of the names on the rotating seasonal list (the previous years were 2020 そして 2005).
We ended the season with
21 名前付きの嵐, 7 ハリケーン, そして 4 major hurricanes
(カテゴリー 3 以上). During an average year there would be
14 名前付きの嵐, 7 ハリケーン, そして 3 major hurricanes
. This year met or exceeded each of those categories
, そしてそれ was forecast to be that way
. The Atlantic hurricane season runs from June
1 11月まで 30.
その後、, 突然, the world’s oceans became eerily quiet. After September 25 the Atlantic and the rest of the world would struggle to produce a named storm.
That was not what meteorologists expected.
“The globe has had no major
(カテゴリー 3+, max winds
) hurricane/typhoon/cyclone formations since September
25. All other hurricane seasons in the satellite era
(以来 1966) have had at least two global major hurricane formations between September
26 – November 19,
” Phil Klotzbach
, a research scientist at Colorado State University
, 前記 ツイートで
. Both last year and this year La Niña conditions were observed during the last several weeks of the season
, which typically favors late season tropical activity
. 2020 saw three named storms in November
, and Iota
) そして 2021 saw just one
) during the first few days
How this hurricane season ended marks one of the biggest differences between this year and last.
Klotzbach explained that usually La Niña weakens or limits vertical wind shear, but surprisingly there was quite elevated wind shear in the Caribbean in October and November — the focal region for storms late in the season — and that led to a quiet latter part of the 2021 大西洋のハリケーンの季節.
While an active season was predicted, it’s impossible to know in advance exactly where each storm will go and what kind of damage it may cause.
A “悪い” season is all about perspective
. Central American countries may consider this to have been a
“良い” year since not a single named storm hit any part of the region
. に 2020
, Central America was hit by three named storms
, two of which were major hurricanes
In the US
, the state of Louisiana can’t seem to catch a break
. に 2020, the Pelican State was impacted by five named storms
, ローラ, Marco
, Delta and Zeta
. This year the state was impacted by three named storms
: クラウデット, Ida and Nicholas
に 2020 more hurricanes made landfall in the US, but this year the storms cost over $ 20 billion more.
Billions in damage
While only one major hurricane made landfall across the US
(井田), a total of four named storms left behind 以上 $ 1 十億 in damage each
: Tropical Storm Elsa
, Tropical Storm Fred
, and Hurricane Nicholas
Ida alone exceeded the cost in damage of all seven billion-dollar tropical cyclones that made landfall across the US in
2020, including hurricanes like Laura
, デルタ, and Zeta
“現在まで, Hurricane Ida is the costliest disaster this year
$ 60 十億,” 米国海洋大気庁によると
. “Ida already ranks among the top-five most costly hurricanes on record for the US since 1980.
Ida was the strongest Atlantic hurricane of the year to make landfall with maximum sustained winds of
150 mph when it struck near Port Fourchon
, ルイジアナ, 8月に 29. It was one of only three hurricanes to ever make landfall in the state of Louisiana with winds of
150 mph, the most recent being Laura from
, Louisiana took a direct hit with
100% of its homes damaged and nearly
40% were nearly-to-completely destroyed
,” according to NOAA
. “There was heavy damage to the energy infrastructure across southern Louisiana causing widespread
, long duration power outages to millions of people.
In the following days the remnants of Ida moved to the Northeast and combined with a frontal system, delivering extreme rainfall rates and flash flooding, inundating streets, homes and neighborhoods.
Flash flood emergencies were declared in New Jersey and ニューヨーク
. 少なくとも 55 people died across New York
, ニュージャージー, コネチカット, メリーランド, Pennsylvania and Virginia
This season’s quirks
The strongest storm of the season didn’t hit land but video was captured from inside it.
Hurricane Sam, like Ida, also reached Category 4 strength with maximum sustained winds of 150 mph. Sam remained a Category 4 hurricane for 4.5 days and generated the fifth-highest accumulated cyclone energy (ACE) recorded in the satellite era.
“ACE is integrated metric accounting for storm intensity and duration
,” Klotzbach tweeted
. “Sam was a long-lived
, intense hurricane.
幸運なことに, unlike Ida, Sam remained out over the open waters of the Atlantic and never made landfall.
Sam’s long life
, of over
11 days as a hurricane
, allowed a research drone to be sailed into it
, そして, 初めて, に transmit video from inside a major hurricane at ocean level
A couple of other storms made some meteorological records.
Tropical Storm Ana formed in a unique area of the Atlantic Ocean
. 最後に 100 年, no named storm had ever developed east of Bermuda in the month of May
. Tropical Storm Ana broke that record
. 典型的に, storms during this month form over the eastern Gulf of Mexico
, western Caribbean Sea and near the southeastern US coast
Another unique storm was Subtropical Storm Teresa. Reports of subtropical storms are not uncommon, especially in the 21st century, thanks to advanced technology. What is uncommon is for a storm to remain subtropical for its entire life, never transitioning to “トロピカル” 状態.
Teresa was also extremely short-lived
, at only
24 時間. Subtropical Storm Teresa formed on Friday
, 9月 24, で 5 午後. Atlantic Standard Time
. 丁度 24 時間後, the NHC issued its final advisory as Teresa became a remnant
, low-pressure system
Ida will likely be the only name on the retired list this year
, despite there being three other major hurricanes
, simply because of the amount of damage and fatalities caused
. 手紙 “私” already has more retired names than any other letter in the alphabet
There are already 12 retired storm names that start with the letter “私”, and Ida will likely become the 13th.