Category Archives: Fortnightly Weather Outlook

Wetter conditions are predicted over the parts of the equatorial region, including the northwestern Maritime Continent, northern Borneo and the southern Philippines in Week 1 (18 – 24 September). Wetter conditions are also predicted over southern Mainland Southeast Asia in Week 2 (25 September – 1 October).

Drier conditions are predicted over most of the southern Maritime Continent in Week 1 (18 – 24 September). These drier conditions are predicted to extend northwards during Week 2 (25 September – 1 October) to cover much of the southern ASEAN region.

Warmer than usual temperature is predicted over much of Mainland Southeast Asia in the next fortnight (18 September – 1 October). In Week 1 (18 – 24 September), warmer than usual temperature is predicted to develop over parts of the equatorial region. By Week 2 (25 September – 1 October), warmer temperature is predicted over much of the southern ASEAN region, in line with the predicted drier conditions.

By the middle of September, there was no clear Madden-Julian Oscillation (MJO) signal. Most models predict no significant MJO activity 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 parts of Mainland Southeast Asia and the northern half of the Philippines in Week 1 (4 – 10 September).

Drier conditions are predicted over much of the southern ASEAN region in the next fortnight (4 – 17 September), with the highest likelihood over the southwestern part of the region.

Warmer than usual temperature is predicted over most of the southern ASEAN region in the next fortnight (4 – 17 September), in line with the predicted drier conditions. Elsewhere, in Week 1 (4 – 10 September), warmer than usual temperature is predicted over much of northern and central Mainland Southeast Asia.

No coherent Madden-Julian Oscillation (MJO) signal was present in the second half of August. Some models predict an MJO signal to develop over the Indian Ocean (Phase 3) or the Maritime Continent (Phases 4 and 5) during the first week of September. These models then predict the signal to propagate eastwards into the Western Pacific (Phases 6 and 7) by 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.

Wetter conditions are predicted over parts of Mainland Southeast Asia and the Philippines in the next fortnight (21 August – 3 September).

Drier conditions are predicted over much of the central Maritime Continent in Week 1 (21 – 27 August). These drier conditions are predicted to extend eastward covering much of the southern half of the Maritime Continent in Week 2 (28 August – 3 September).

Warmer than usual temperature is predicted over much of the Maritime Continent in the next fortnight (21 August – 3 September), in line with the predicted drier conditions. Warmer than usual temperature is also predicted over much of northern Mainland Southeast Asia in the next fortnight.

No coherent Madden-Julian Oscillation (MJO) signal was present during the first half of August. During the forecast period, models predict no strong MJO signal, although a few models predict a weak MJO signal to develop over the Western Hemisphere and Africa (Phases 8 and 1) and then propagate eastwards.

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 much of the southern ASEAN region in the next fortnight (7 – 20 August). Drier conditions are also predicted over much of Mainland Southeast Asia and northern parts of the Philippines in Week 1 (7 – 13 August).

Wetter conditions are predicted over the central and southern Philippines as well as the surrounding region in the next fortnight (7 – 20 August).

Warmer than usual temperature is predicted over the eastern equatorial region in Week 1 (7 – 13 August). These warmer temperatures are predicted to extend westwards to cover most of the central and eastern equatorial region in Week 2 (14 – 20 August). Warmer than usual temperature is also predicted over much of the northern ASEAN region in the next fortnight (7 – 20 August).

No Madden-Julian Oscillation (MJO) signal was present at the start of August. Most models predict no significant MJO signal 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.

Drier conditions are predicted over much of the southern ASEAN region in Week 1 (24 – 30 July). These drier conditions are predicted to persist over the central and eastern parts of the mentioned region in Week 2 (31 July – 6 Aug).

Wetter conditions are predicted over the northern half of the Philippines in Week 1 (24 – 30 July). Wetter conditions are also predicted over parts of the western Maritime Continent in Week 2 (31 July – 6 Aug).

Warmer than usual temperature is predicted over much of the Maritime Continent in the next fortnight (24 July – 6 Aug). Warmer than usual temperature is also predicted over northern Mainland Southeast Asia in Week 1 (24 – 30 July).

No clear Madden-Julian Oscillation (MJO) signal was present in the third week of July. Most models predict no significant MJO signal 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 parts of the southeastern Maritime Continent in Week 1 (10 – 16 July) and much of Mainland Southeast Asia in Week 2 (17 – 23 July). Wetter conditions are also predicted over much of the Philippines in the next fortnight (10 – 23 July).

Drier conditions are predicted over parts of the western and central equatorial region in Week 2 (17 – 23 July).

Warmer than usual temperature is expected over much of the northern ASEAN region in Week 1 (10 – 16 July). Warmer temperatures are then predicted over much of the southern ASEAN region in Week 2 (17 – 23 July).

No clear Madden-Julian Oscillation (MJO) signal was present in the first week of July based on the RMM Index. Most models predict no significant MJO signal during the next fortnight.

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 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.