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The Atlantic Ocean has seen a historic record number of 30 tropical storms till November 30 this yr, the World Meteorological Organisation (WMO) has mentioned. The earlier highest number was 28 storms in 2005.
The excessive number of storms has meant that, amongst different issues, the WMO’s annual listing of storm names for a calendar yr was exhausted by September and it had to make use of Greek alphabets to call the storms thereafter.
Interestingly, this listing — comprising female and male names — is used alternatively to determine the storms shaped in the Atlantic Ocean. It accommodates names beginning with 21 alphabets, excluding these with Q, U, X, Y and Z. Normally, the Atlantic Ocean experiences 12 storms yearly and this listing typically stays totally used.
But given the frequency of hurricanes shaped in 2020, the WMO has needed to, to date, make use of 9 Greek alphabets — Alpha, Beta, Gamma, Delta, Epsilon, Zeta, Eta, Theta and Iota. It is just the second time ever, after 2005, when Greek alphabets had been used to call Atlantic storms.
Meteorologists world over observe that 2020 continues to stay a really energetic yr, favouring formation of cyclonic storms and hurricanes internationally.
Here, in the north Indian Ocean area — the Bay of Bengal and the Arabian Sea collectively, Super cyclone Amhpan (May), cyclones Nisarga (June) and Gati (November), extreme cyclone Nivar (November) and the current cyclone Burevi developed this yr. Normally, India information 5 cyclones in a yr, of which 4 originate in the Bay of Bengal.
Six of the 13 hurricanes developed in the Atlantic Ocean till November 30 had been main hurricanes. Of the entire 30 hurricanes, 12 made landfall in the continental US.
“This is the second highest number of storms on record and the second-highest number of hurricanes on record in the Atlantic Ocean,” acknowledged a WMO report.
Along with frequent hurricanes, the WMO noticed that almost all of these programs confirmed speedy intensification and comparatively slower motion. Only 10 hurricanes — Hanna, Laura, Sally, Teddy, Gamma, Delta, Epsilon, Zeta, Eta and Iota — displayed exceptional strengthening inside a really quick length.
The prevailing La Nina situations, coupled with inter-related ocean atmospheric situations linked to heat Atlantic Multi-Decadal Oscillation, led to such a record number of storms, mentioned the WMO.
La Nina is a phenomenon when cooler-than-average sea floor temperatures are recorded alongside the equatorial and central Pacific Ocean.
“Stronger west Africa monsoon and weak wind vertical shear coming off Africa were all favourable for the storm formation,” learn the WMO assertion.
Meteorologists, together with consultants on the India Meteorological Department (IMD), have famous the warmer-than-normal ocean temperatures and linked the phenomenon to local weather change. “We have noted warmer sea surface temperatures in the north Indian Ocean,” mentioned Dr D Sivananda Pai, head of Climate Research and Services at IMD, Pune.
This is the primary purpose for the longer-than-average cyclone season and quite a few occasions of speedy intensification, mentioned Jim Kossin of National Centres for Environmental Information, working below NOAA.
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