US hur­ri­cane, Asian typhoon: 1 brings wa­ter, the other, wind

The Myanmar Times - - World -

NA­TURE ex­presses its fury in sundry ways. Two deadly storms — Hur­ri­cane Florence and Typhoon Mangkhut — roared ashore on the same day, half a world apart, but the way they spread dev­as­ta­tion was as dif­fer­ent as wa­ter and wind.

Storms in the western Pa­cific gen­er­ally hit with much higher winds and the peo­ple who live in their way are of­ten poorer and more vul­ner­a­ble, Prince­ton Univer­sity hur­ri­cane and cli­mate sci­en­tist Gabriel Vec­chi said Satur­day. That will likely de­ter­mine the type of de­struc­tion.

Mangkhut made land­fall Fri­day on the north­east­ern tip of Lu­zon is­land in the Philip­pines with topof-the-scale Cat­e­gory 5 winds of 165 mph. Florence had weak­ened to a Cat­e­gory 1 storm with 90 mph winds by the time it ar­rived at North Carolina’s coast.

Yet a day af­ter land­fall the faster­mov­ing Mangkhut was back out over open wa­ter — weak­ened, but headed across the South China Sea to­ward China. Florence, mean­while, was still plod­ding across South Carolina at a pace slower than a nor­mal per­son walks. By Satur­day morn­ing, it had al­ready dumped more than 30 inches (76 cen­time­ters) of rain, a record for North Carolina.

Ex­perts say Mangkhut may well end up be­ing the dead­lier storm. As of Satur­day af­ter­noon, the death count in the Philip­pines was a bit higher, although still far be­low that of other storms that have hit the dis­as­ter-prone is­land na­tion. And with Mangkhut now headed to­ward the densely pop­u­lated south­east coast of China, it is likely to cause more death and de­struc­tion. But Florence’s wa­tery in­sured dam­age to­tal will even­tu­ally be higher, Ernst Rauch, head of cli­mate re­search for the world’s largest rein­surer Mu­nich Re, told Ger­man me­dia.

That’s be­cause of a com­bi­na­tion of ge­og­ra­phy, cli­matic con­di­tions and hu­man fac­tors.

The western Pa­cific has two-anda-half times more storms that reach the min­i­mum hur­ri­cane strength of 74 mph. It has three-and-a-half times more storms that reach ma­jor hur­ri­cane strength of 111 mph, and three times more ac­cu­mu­lated en­ergy out of those hur­ri­canes, an in­dex that mea­sures not just strength and num­ber of storms but how long they last, ac­cord­ing to more than 65 years of storm data .

So far this year there have been 23 named storms in the western Pa­cific and 10 in the At­lantic, both re­gions more than 30 per­cent busier than av­er­age years. Hur­ri­canes and typhoons are the same type of storm; both are trop­i­cal cy­clones, but those that oc­cur in the Pa­cific west of the In­ter­na­tional Date Line are called typhoons.

The wa­ter in the western Pa­cific is warmer, and warm wa­ter fu­els storms. There are also only a few pieces of land to get in the way and weaken them, said Univer­sity of Mi­ami hur­ri­cane re­searcher Brian McNoldy.

“If we are ever go­ing to have a Cat­e­gory 6 (a spec­u­lated-on level that’s above cur­rent mea­sure­ment tools), the western Pa­cific is where it’s go­ing to be,” said me­te­o­rol­o­gist Ryan Maue of weath­er­mod­

The Philip­pines tends to get hit nearly ev­ery year, the Caroli­nas far less fre­quently though with lots of close calls, Maue said. That shows an­other big dif­fer­ence in the storms. Mangkhut formed fur­ther south and stayed south — over warmer wa­ter. Florence was out of the trop­ics when it hit land.

Be­cause of that, Florence was weak­ened by the dry air and up­per level winds of the higher lat­i­tudes. Not so the more southerly Mangkhut, which Maue said, “es­sen­tially had a per­fect en­vi­ron­ment to in­ten­sify to a Cat­e­gory 5 and stay there.”

“Mangkhut and Florence are cer­tainly dif­fer­ent an­i­mals,” said Colorado State Univer­sity hur­ri­cane re­searcher Phil Klotzbach. Be­cause Florence is mov­ing so slowly, he said, it will dump more rain than Mangkhut, which is named for the Thai word for the man­gos­teen fruit. .

Photo: AP

Res­i­dent Joseph Eudi looks at flood de­bris and storm dam­age from Hur­ri­cane Florence at a home on East Front Street in New Bern, North Carolina, on Satur­day.

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