Category Archives: Fortnightly Weather Outlook

Wetter conditions are predicted over parts of northeast Mainland Southeast Asia in Week 1 (12 – 18 June) and over northwest Mainland Southeast Asia in Week 2 (19 – 25 June).

Drier conditions are predicted over most of the Maritime Continent and parts of southern Mainland Southeast Asia in Week 2 (19 – 25 June).

Warmer than usual temperature is expected over much of the Maritime Continent in Week 1 (12 – 18 June). These warmer conditions are predicted to persist and extend northwards over southern Mainland Southeast Asia in Week 2 (19 – 25 June).

A Madden-Julian Oscillation (MJO) signal was present over the Western Hemisphere and Africa (Phases 8 and 1) in the first week of June based on the RMM Index. Most models predict this MJO signal to continue propagating eastward through the Indian Ocean (Phases 2 and 3) and decay over the Maritime Continent (Phases 4 and 5) during the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Wetter conditions are predicted over much of southern Mainland Southeast Asia in Week 1 (29 May – 4 June). These wetter conditions are predicted to extend northwards over parts of central Mainland Southeast Asia in Week 2 (5 – 11 June). Wetter conditions are also predicted over much of the Philippines in the next fortnight (29 May – 11 June).

Drier conditions are predicted over much of the southern ASEAN region in Week 1 (29 May – 4 June). These drier conditions are predicted to ease during Week 2 (5 – 11 June).

Warmer than usual temperature is predicted over much of the southern ASEAN region during the next fortnight (29 May – 11 June), in line with the predicted drier conditions. Warmer conditions are also predicted over the northern half of Mainland Southeast Asia in Week 1 (29 May – 4 June).

A Madden-Julian Oscillation (MJO) signal was present over the Western Pacific (Phases 6 and 7) in the second half of May. Most models predict this MJO signal to decay in Phases 7 or 8 during Week 1.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Drier conditions are predicted over most of the central Maritime Continent during the next fortnight (15 – 28 May). Drier conditions are also predicted over much of Mainland Southeast Asia in Week 1 (15 – 21 May). Wetter conditions are predicted over most parts of the Philippines in Week 2 (22 – 28 May).

Warmer than usual conditions are expected over much of Mainland Southeast Asia and parts of the western Maritime Continent in Week 1 (15 – 21 May). These warmer conditions are predicted to gradually ease during Week 2 (22 – 28 May). Over much of the eastern Maritime Continent, warmer than usual temperature is predicted during Week 2.

A Madden-Julian Oscillation (MJO) signal was present over the Maritime Continent (Phases 4 and 5) in the first week of May. Most models predict this MJO signal to continue propagating eastwards through the Western Pacific (Phases 6 and 7) during the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

In Week 1 (1 – 7 May), drier conditions are predicted over much of central and eastern Mainland Southeast Asia, as well as northern parts of the Philippines. Also in Week 1, wetter conditions are predicted over much of the Maritime Continent.

Warmer than usual temperature is predicted over much of the eastern half of the Maritime Continent during the next fortnight (1 – 14 May). Warmer than usual temperature is also predicted over much of Mainland Southeast Asia in Week 1 (1 – 7 May).

A Madden-Julian Oscillation (MJO) signal was present over the Indian Ocean (Phase 2) at the end of April. Most models predict an MJO signal to continue propagating eastwards reaching the Western Pacific (Phases 6 and 7) in Week 2 (8 – 14 May).

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

In Week 1 (17 – 23 April), drier conditions are predicted over much of Mainland Southeast Asia, the Malay Peninsula and parts of the central Maritime Continent.

Warmer than usual temperature is predicted over much of Mainland Southeast Asia and the Malay Peninsula in Week 1 (17 – 23 April), in line with the predicted drier conditions over these regions.

A Madden-Julian Oscillation (MJO) signal was present over the Western Pacific (Phases 6 and 7) in the second week of April. Most models predict this MJO signal to continue propagating eastwards before decaying over the Western Hemisphere and Africa (Phase 1) towards the end of the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Drier conditions are expected over much of Mainland Southeast Asia in Week 1 (3 – 9 April), in particular over central parts of Mainland Southeast Asia. Drier conditions are also predicted over parts of the western and central Maritime Continent in Week 2 (10 – 16 April).

Warmer than usual temperature is predicted over much of Mainland Southeast Asia in Week 1 (3 – 9 April), in line with the predicted drier conditions. These warmer conditions are predicted to persist over central Mainland Southeast Asia and gradually ease elsewhere in Week 2 (10 – 16 April).

No discernible Madden-Julian Oscillation (MJO) signal was present at the end of March. Most models predict an MJO signal to emerge in the Western Pacific (Phases 6 and 7) during Week 1 and then slowly propagate eastwards over the rest of the forecast period. However, some models predict no discernible MJO signal during this time.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Drier conditions are expected over much of the northern ASEAN region in Week 1 (20 – 26 March), in particular over central and eastern Mainland Southeast Asia and northern Philippines. These drier conditions are predicted to persist over these regions and extend further southwards to the Malay Peninsula in Week 2 (27 March – 2 April).

Warmer than usual temperature is expected over central and eastern Mainland Southeast Asia and northern Philippines in the next fortnight (20 March – 2 April), in line with the predicted drier conditions.

A Madden-Julian Oscillation (MJO) signal was present over the Western Hemisphere and Africa (Phases 8 and 1) in the middle of March. Models predict this signal to weaken and continue propagating eastwards to the Indian Ocean (Phase 2), and decay by the end of Week 1.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Drier conditions are expected over the southern Maritime Continent in the next fortnight (6 – 19 March). Drier conditions are also expected over southern Mainland Southeast Asia in Week 1 (6 – 12 March).

Wetter conditions are expected over much of the western Maritime Continent in Week 1 (6 – 12 March) and much of the northeastern Maritime Continent in Week 2 (13 – 19 March).

Cooler than usual temperature are predicted over much of the ASEAN region in the next fortnight (6 – 19 March), in particular over southern Mainland Southeast Asia, the western and central Maritime Continent and parts of the Philippines.

No clear Madden-Julian Oscillation (MJO) signal was present at the end of February. Models predict an MJO signal to emerge over the Western Pacific (Phases 6 and 7) by Week 1 and propagate eastwards over the Western Hemisphere and Africa (Phases 8 and 1) during the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Wetter conditions are expected over the western Maritime Continent in the next fortnight (20 February – 5 March). Wetter conditions are also expected over the northeast Maritime Continent in Week 1 (20 – 26 February).

Cooler than usual temperature is expected over most of central and eastern Mainland Southeast Asia and also over parts of the western Maritime Continent in the next fortnight (20 February – 5 March).

A Madden-Julian Oscillation (MJO) signal was present over the Western Pacific (Phases 6 and 7) in the middle of February. Models predict this MJO signal to continue propagating eastwards and then decay in Week 1 over the Western Hemisphere (Phases 8 and 1).

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Drier conditions are expected over parts of the western and central Maritime Continent in Week 1 (6 – 12 February). These drier conditions are predicted to persist over the central Maritime Continent in Week 2 (13 – 19 February) and likely easing over the western Maritime Continent.

Wetter conditions are predicted over the northeastern Maritime Continent and southeastern coast of Mainland Southeast Asia in Week 2 (13 – 19 February).

Warmer than usual temperature is expected over much of the eastern half of Mainland Southeast Asia and much of the Philippines in Week 1 (6 – 12 February). Warmer than usual temperature is also expected over parts of the western and central Maritime Continent in Week 1, in line with the predicted drier conditions.

A Madden-Julian Oscillation (MJO) signal was present over the Indian Ocean (Phase 3) at the start of February. Models predict the MJO signal to propagate eastwards and reach the Maritime Continent (Phases 4 and 5) during the first week of the forecast period. Some models then predict this signal to continue propagating through the Maritime Continent to the Western Pacific (Phases 6 and 7), while others predict the signal to decay over the Maritime Continent.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.