BMKG: Typhoon Hagibis Triggers 4 Meters Wave in Indonesian Waters, Communities Are Urged on Alert

TRIBUNBATAM.id - The Meteorology, Climatology and Geophysics Department revealed the Typhoon Hagibis 915 hPa in the Pacific Ocean of the Northeast of the Philippines which has the potential to trigger waves as high as 4 meters in Indonesian waters.

Head of BMKG's Climate and Weather Sub-Division, Agie Wandala said, Typhoon Hagibis is a tropical cyclone that currently occurring in the northern hemisphere.

"(The location) is quite far from Indonesia, so the impact is indirect," Agie said, when contacted by Kompas.com on Thursday (10/10/2019).

According to him, a tropical cyclone is a storm with an average radius of 150-200 km.

He explained, the tropical cyclones are formed over large oceans which generally have a warm sea surface temperatures with temperatures of 26.5 degrees celsius. 

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Meanwhile, sometimes at the center of a tropical cyclone, an area with relatively low wind speed and no clouds is formed that called the Cyclone's Eye.

The eye of this cyclone has a diameter that varies, which is 10-100 km. 

Not only that, the cyclone's eye is surrounded by a wall of the eye, which is a ring-shaped region that can reach a thickness of 16 km where this region has the highest wind speed and greatest rainfall.

The average life span of a tropical cyclone ranges from 3-18 days, because the energy of the cyclone is obtained from the warm ocean.

"Therefore, tropical cyclones will weaken or become extinct when they move into the cold waters or entering the land," Agie said. 

Wind velocity

In addition, when tropical cyclones are formed, the researchers observe the maximum wind speed, which is the surface wind that averages at the highest 10 minutes in the cyclone's circulation region.

"The wind with the highest speed is usually found in the ring region near the center of the cyclone, or if this cyclone has eyes, it is in the walls of its eyes," Agie said.

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The wind pattern in the northern part of Indonesia, generally from Southeast-Southwest and has a speed of 3-20 knots.

Meanwhile, in the southern region of Indonesia, from East-Southeast has a speed of 4-20 knots.

It is known, the highest wind speeds are observed in the southern Sunda Strait, southern waters of Banten, southern waters of Kalimantan, southern Makassar Strait, Arafuru Sea, and Raja Ampat-Sorong waters.

The high wind speed can cause an increase in wave height around the area. 

High waves, reaching 2.5 meters

Not only of that, based on BMKG monitoring results, there are a number of regions in Indonesia that will be hit by waves, as high as 1.25-2.5 meters, namely:

• North Sabang waters 
• Sabang-Banda Aceh waters
• Western waters of Aceh 
• Western waters of P. Simeulue to Mentawai Islands
• Bengkulu waters
• West Lampung waters
• Sumatra West Indian Ocean
• Southern Sunda Strait
• Southern waters of Java Island to Sumba Island
• Western Sumba Strait, and
• Sawu Sea 
• Southern Waters of Sawu – Rotte Island
• South Timor Sea NTT
• Indian Ocean South Java to NTT
• East Java Sea
• The waters of the Sangihe Islands - the Talaud Islands
• North Maluku Sea
• North-West Halmahera Waters
• Northern Morotai Waters
• Halmahera Sea, and
• North Pacific Ocean Halmahera 

For this information, BMKG urges to the public to be aware of the potential of high waves in a number of areas. (*) 

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