Southeast Asia Weather & Natural Hazards Today: Wednesday, November 11, 2026

Nov 11, 2026 · @Paul

By Paul Harrison, Orbis Weather

Heavy monsoon rain is the main hazard across Southeast Asia on Wednesday, November 11. Central Vietnam, southern Thailand, Malaysia’s east coast and five provinces on Indonesia’s Sumatra island are all under official rain warnings, and flood relief centres were open in Malaysia as of Monday. In Indonesia, Mount Semeru erupted twice on Tuesday morning, while the Philippines’ Mayon Volcano stays at Alert Level 3.

No tropical cyclone threatens the region: Typhoon Cempaka is moving away to the northeast, south of Japan. This report is current to 7:00 a.m. Wednesday in Bangkok, Hanoi and Jakarta (UTC+7), 8:00 a.m. in Manila, Singapore and Kuala Lumpur (UTC+8), and 7:00 p.m. Tuesday, November 10, US Eastern time.

Key facts

Tropical cyclones

No tropical cyclone threatens Southeast Asia. The only active storm in the western Pacific, Typhoon Cempaka, is far to the northeast, east of Chichijima in Japan, and moving away.

The Joint Typhoon Warning Center (JTWC) listed no other tropical disturbances in the western Pacific or South China Sea in its advisory issued at 13:00 Tuesday Bangkok time. Its north Indian Ocean advisory, issued at 01:00 Tuesday Bangkok time, showed no cyclones or disturbances in the Bay of Bengal or Andaman Sea. JMA and JTWC measure wind over different averaging periods (10 minutes and one minute), so their figures differ.

Floods and heavy rain

Vietnam

Vietnam’s National Centre for Hydro-Meteorological Forecasting (NCHMF) said rain from Hue to Da Nang and in eastern Quang Ngai and Dak Lak totalled 150–250 mm from Monday morning to Tuesday night, locally over 400 mm, and would gradually decrease from Wednesday, Vietnam News via The Star reported on Tuesday. Disaster risk is at level 2 in Hue, Da Nang and eastern Quang Ngai. Quang Tri’s civil defence command recorded 402 mm at Huong Son and 364 mm at Vinh O by 5:00 a.m. Tuesday (UTC+7). The Thach Han River was 0.34 m below alarm level 2 and rising; the Huong River in Hue was 0.37 m above alarm level 1. In Thanh Hoa’s Nong Cong commune, 1,577 houses were flooded, and a landslide hit Road 9C in Quang Tri. No deaths were reported. A government dispatch signed on November 7 by Deputy Prime Minister Ho Quoc Dung ordered eight provinces to prepare evacuations and rescue equipment, NetNewsLedger reported.

Thailand

The Thai Meteorological Department’s Advisory No. 5, issued at 5:00 p.m. Tuesday (UTC+7), warns of heavy rain on Wednesday in Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung and Songkhla, and very heavy rain on Thursday in Chumphon, Surat Thani and Nakhon Si Thammarat, with risks of flash floods and landslides (The Nation). Waves in the lower Gulf of Thailand are 2–3 m, over 3 m in thunderstorms, and small boats are told to stay ashore. The Department of Disaster Prevention and Mitigation (DDPM) has 16 provinces on flood watch through Friday and sent a mobile-phone flood alert to Phatthalung on Tuesday (The Nation). Separately, flooding in the central plains that began in September had affected 162,800 people in seven provinces as of 6:00 p.m. on November 8, with 88 deaths reported by DDPM in total, according to the ASEAN AHA Centre.

Malaysia

The Malaysian Meteorological Department (MetMalaysia) said a monsoon surge would bring continuous heavy rain to the east coast of Peninsular Malaysia and eastern Sabah until Wednesday. Its warning was at the “severe” level for five Kelantan districts and most of Terengganu as of 8:30 a.m. Monday (Malay Mail). On the west coast, 1,002 people were in six relief centres in Selangor and Perak on Monday afternoon, and the Kinta and Bidor rivers in Perak were above danger level (Malay Mail). “We have a total of 45 boats, of which 35 are operational,” Kelantan fire and rescue director Farhan Sufyan Borhan told Bernama (Malay Mail).

Indonesia

BMKG put Aceh, North Sumatra, West Sumatra, Bengkulu and Jambi on “Siaga” (alert) for heavy to very heavy rain on Wednesday, with 26 other provinces on “Waspada” (watch), Arina.id reported. Waves of 2.5–4 m are possible in the North Natuna Sea and in the Indian Ocean south of East Java. Earlier, floods on November 5 and 7 in Deli Serdang and Serdang Bedagai, North Sumatra, affected about 9,600 people, according to the AHA Centre, which also cited a BMKG “Awas” (highest) rain warning for North Sumatra for November 9–12.

Country-by-country weather today

Earthquakes

All eight earthquakes of magnitude 4.4 or more that the US Geological Survey recorded in the region over the past 48 hours were in Indonesia. The five largest are listed below (USGS).

Tsunami status: USGS flagged no tsunami potential for any of these events.

Volcanoes

Alert levels run from 0 or 1 (normal) to 4 or 5 depending on the country; Indonesia’s Level III is “Siaga” (alert), one step below the highest.

Haze, fires and air quality

There is no major haze episode. The ASEAN Specialised Meteorological Centre has downgraded the southern ASEAN region to haze Alert Level 1 and reports few to isolated hotspots (fire sites seen by satellite) in Kalimantan, Sumatra and Cambodia, with moderate smoke haze over central Sulawesi and southern Papua (ASMC). In Singapore, the onset of inter-monsoon showers ended this year’s haze season, AsiaOne reported.

What to watch over the next few days

• Southern Thailand: very heavy rain is forecast for Surat Thani and Nakhon Si Thammarat through Friday, November 13, with heavy rain spreading to the Andaman coast provinces.
• Central Vietnam: whether rivers in Quang Tri and Hue fall as the rain eases; NCHMF has forecast the highest daily levels on the Tien and Hau rivers in the south by Friday.
• Malaysia: MetMalaysia’s continuous-rain warnings expire on Wednesday; watch for renewals in Kelantan and Terengganu.
• Philippines: PAGASA expects the amihan to retreat to northern Luzon by Thursday, with easterly rain shifting to eastern Mindanao by Friday and Saturday.
• Indonesian volcanoes: further eruptions at Semeru, where BNPB says ash has been spreading west and southwest toward Malang.

About this article

This article summarises official bulletins and news reports from national weather, disaster and volcano agencies and is not an official warning; readers should follow their national agencies for warnings and evacuation orders. Figures are those published at the times stated and may since have changed. Wind speeds were converted from knots and metres per second to km/h and rounded. Earthquake magnitudes are from the US Geological Survey and may differ from national agencies’ figures. Some national agencies publish little in English, so coverage of Myanmar, Laos, Cambodia, Brunei and Timor-Leste is limited.

Frequently asked questions

Is a typhoon heading for the Philippines or Vietnam? No. Typhoon Cempaka briefly entered the Philippine Area of Responsibility on Monday and left it the same afternoon, PAGASA said. It is now moving east-northeast, away from land in Southeast Asia, and JMA expects it to lose its tropical character east of Japan by Thursday.

Why is it raining so heavily in southern Thailand and Malaysia’s east coast? The northeast monsoon is setting in, and MetMalaysia described a “monsoon surge” of stronger winds pushing moist air onto the east coasts. Thailand’s weather department linked the rain and cooler mornings in the north to a strong high-pressure system from China strengthening easterly winds.

Is it safe to travel to Bangkok? Official bulletins show no major weather hazard for central Bangkok, where mornings are cooler and windier. DDPM has warned that high tides on the Chao Phraya could flood low-lying riverside areas, mainly between about 6:00 a.m. and 1:30 p.m., until November 17.

What does Alert Level 3 mean at Mayon and Semeru? Both countries use Level 3 to signal heightened unrest with a risk of hazardous eruptions, one or two steps below their highest level. At Mayon, PHIVOLCS recommended evacuating the 6 km Permanent Danger Zone; at Semeru, people must keep out of a 5 km radius of the crater and away from the Besuk Kobokan river valley.

Sources

• Japan Meteorological Agency: active tropical cyclones and Typhoon Cempaka specifications
• JTWC western Pacific advisory and Indian Ocean advisory
• DZRH: Amihan, easterlies to bring cloudy skies, rains
• Philippine News Agency: Easterlies, amihan to bring rains
• Daily Tribune: PAGASA warns of mixed weather conditions
• The Star / Vietnam News: Prolonged heavy rain poses flooding in central Vietnam
• NetNewsLedger: Vietnam orders flood preparations
• The Nation: TMD advisory No. 5
• The Nation: DDPM Phatthalung flood alert
• The Nation: DDPM puts 16 provinces on flood alert
• The Nation: TMD forecasts temperature drop
• The Thaiger: Chao Phraya high tide
• Malay Mail: MetMalaysia continuous rain warning
• Malay Mail: Selangor and Perak evacuees
• Malay Mail: Kelantan fire department readies boats
• Meteorological Service Singapore: fortnightly outlook
• AsiaOne: Thundery showers on Nov 9; PUB flash flood alert
• Arina.id: BMKG rain warnings for 11 November 2026
• Tribunnews: BMKG early warning, 11 November 2026
• AHA Centre: Weekly Disaster Update, 2–8 November 2026
• USGS earthquake catalogue query
• Jawa Pos: Semeru erupts again
• Okezone: Three volcanoes at Siaga level
• GMA News: Mayon Volcano emits ash anew
• ASEAN Specialised Meteorological Centre