The National Centre for Hydro-Meteorological Forecasting said that at 4 am on November 5, the storm’s centre was located about 560km east of Song Tu Tay Island.
Over the next 24 hours, Kalmaegi is forecast to track west-northwest at about 25km per hour.
By 4 am on November 6, the storm, the 13th to form this year in the area, is expected to be about 550km east-southeast of the coast of Gia Lai Province, strengthening to level 14 with gusts at level 17.
Kalmaegi is projected to make landfall between Danang and Khanh Hoa from late November 6 to early November 7.
At 4 am on November 7, the storm will be over inland areas from Quang Ngai to Dak Lak with wind levels of 9-10, gusting to level 12, and gradually weakening.
From early November 6, offshore areas from Danang to Khanh Hoa will see winds strengthening to level 6-7, later increasing to level 8-11. Areas near the storm’s centre may experience level 12-14, with gusts up to level 17.
From the evening of November 6, coastal areas from southern Quang Tri to Danang and eastern parts of Quang Ngai to Dak Lak will see winds increasing to level 6-7, later rising to level 8-9. Areas near the storm’s centre may experience level 10-12 with gusts at level 14-15.
Forecasters warned that from the evening of November 6, coastal areas from Hue to Dak Lak could face waves 4-6m high, rising to 6-8m near the storm’s centre. Storm surge and strong waves may lead to flooding in low-lying areas.
From November 6 to 7, Danang to Dak Lak is expected to receive very heavy rainfall of 200-400mm, with some areas exceeding 600mm.
Southern Quang Tri to Hue, Khanh Hoa and Lam Dong are likely to see heavy rain of 150-300mm, with some areas exceeding 450mm.
Rainfall is forecast to ease from November 8.