5 months ago
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At slightest 3 cyclones successful the past person had an root akin to Cyclone Ditwah and moved parallel to the Tamil Nadu coastline. Among them, Cyclone Nisha, which struck successful November 2008, has been the astir caller and astir similar.
Cyclone Nisha, which formed implicit the Comorin area, was tracked on the seashore earlier making landfall successful the delta portion connected November 27.
“No 2 cyclones are alike. But we tin way depressions oregon cyclonic storms that either had akin origins oregon followed a somewhat akin way to Cyclone Ditwah,” said Y.E.A. Raj, erstwhile Deputy Director-General of Meteorology, Chennai.
Pointing retired that the upwind strategy formed adjacent the Comorin country astatine a debased latitude and had intensified rapidly, helium said it could beryllium called a marginal cyclone.
A fewer depressions and cyclonic storms, including 1 successful October 1982, person had tracks somewhat akin to Cyclone Ditwah. A heavy slump implicit the Bay of Bengal, which passed northeast of Sri Lanka, approached the Tamil Nadu seashore connected December 20, 1993. It caused dense rainfall successful the State and Puducherry.
In December 1983, a low-pressure country implicit the Bay of Bengal concentrated into a slump implicit Sri Lanka and travelled done the landmass. It crossed the southbound Tamil Nadu seashore adjacent Adiramapattinam connected December 23 earlier weakening implicit the interior parts of Tamil Nadu and Kerala.
It brought dense to precise dense rainfall successful places specified arsenic Nagapattinam, Karaikal, and Mannargudi, Mr. Raj said.
Weather blogger K. Srikanth, who runs the Chennaiyil Oru Mazhaikalam blog, said: “Cyclone Ogni [October 2006] was 1 of the systems that had a way that intimately resembles Ditwah’s. Though Ogni did not question implicit Sri Lanka, it originated implicit the Comorin country and continued moving parallel to the Chennai coast.”
Land interactions
Cyclone Ditwah stands retired for its prolonged enactment with land, having spent implicit 36 hours connected the Sri Lankan landmass earlier moving towards the Tamil Nadu coast.
Cyclone Nisha, which affected some Sri Lanka and Tamil Nadu, besides spent important clip travelling implicit Sri Lanka earlier its landfall northbound of Karaikal, causing dense flooding. Cyclone Roanu of May 2016 besides had a akin trajectory and formed eastbound of Sri Lanka and travelled on the Tamil Nadu coast. But it did not get adjacent to Chennai, Mr. Srikanth added.
Meanwhile, north-coastal districts are connected alert arsenic beardown aboveground winds of 60-70 kmph, gusting up to 80 kmph, are expected to prevail connected Sunday arsenic Cyclone Ditwah moves person to the Chennai coastline. While Tiruvallur and Ranipet districts are apt to acquisition highly dense rain, 9 districts, including Chennai and Krishnagiri, whitethorn person dense to precise dense rainfall. Officials of the Regional Meteorological Centre said Chennai would commencement receiving intermittent spells of dense to precise dense rainfall from Saturday night.
B. Amudha, Head, (Additional in-charge), Regional Meteorological Centre, said places specified arsenic Karaikal and Nagapattinam continued to person aggravated rainfall connected Saturday, logging 15 cm and 11 cm respectively till 6 p.m.
Wind recorders successful places specified arsenic Chennai, Ennore, and Pamban recorded beardown winds of 40 kmph and 60 kmph. With the State’s November rainfall remaining astatine a shortage — 13 cm against a mean of 18 cm — Cyclone Ditwah is expected to trim the shortfall. However, seasonal rainfall since October 1 remains 3% supra the mean of 35 cm, Ms. Amudha added.
