BADAN METEOROLOGI,
KLIMATOLOGI DAN GEOFISIKA
Indonesian Weather Bulletin for Shipping
( Metarea XI)
BMKG Jakarta, Tuesday 23 September 2025 At 1800 UTC
Part I : Warning
TROPICAL CYCLONE RAGASA AT 20.4°N 117.1°E 931HPA MAXIMUM WIND 120 KNOT MOVE TO WNW TROPICAL LOW 92W AT 10.1°N 135.5°E 1003HPA MAXIMUM WIND 20 KNOT MOVE TO W
Part II : General Synopsis
Tuesday 23 September 2025 at 00 UTC SOUTHERLY TO SOUTHWESTERLY GENTLE TO FRESH FLOW IN THE NORTHERN PART OF INDONESIA EASTERLY TO SOUTHERLY GENTLE TO FRESH FLOW IN THE SOUTHERN PART OF INDONESIA
Part III : Area Forecasts
Valid until Wednesday 24 September 2025 at 18 UTC
MALACCA STRAIT
Northerly
4-5 kt
Slight Sea
INDIAN OCEAN WESTERN OF ACEH
Westerly
1-17 kt
Rough Sea
INDIAN OCEAN WESTERN OF LAMPUNG
Southeasterly
4-13 kt
Rough Sea
INDIAN OCEAN SOUTHERN OF JAVA
Southeasterly
11-15 kt
Rough Sea
INDIAN OCEAN SOUTHERN OF BALI
Easterly
7-17 kt
Rough Sea
NORTH NATUNA SEA
Southwesterly
10-18 kt
Moderate Sea
KARIMATA STRAIT
Northwesterly
4-12 kt
Slight Sea
JAVA SEA
Southeasterly
5-15 kt
Slight Sea
MAKASSAR STRAIT
Southeasterly
6-18 kt
Moderate Sea
BALI SEA
Easterly
3-16 kt
Slight Sea
SUMBAWA SEA
Southeasterly
3-15 kt
Slight Sea
FLORES SEA
Easterly
3-18 kt
Slight Sea
BANDA SEA
Southeasterly
3-19 kt
Moderate Sea
CERAM SEA
Easterly
2-14 kt
Slight Sea
SULAWESI SEA
Westerly
3-14 kt
Moderate Sea
MOLLUCA SEA
Southwesterly
2-16 kt
Moderate Sea
WESTERN PART OF PACIFIC OCEAN
Westerly
2-18 kt
Moderate Sea
ARAFURA SEA
Easterly
2-20 kt
Moderate Sea
⚠️ Important Notes
Please be aware, wind gusts can be a further 40 percent stronger than the averages given here, and maximum waves may be up to twice the significant height
Reference Scales
Beaufort Wind Scale
| Force | Description | Speed (knots) |
|---|---|---|
| 0 | Calm | < 1 |
| 1 | Light air | 1-3 |
| 2 | Light breeze | 4-6 |
| 3 | Gentle breeze | 7-10 |
| 4 | Moderate breeze | 11-16 |
| 5 | Fresh breeze | 17-21 |
| 6 | Strong breeze | 22-27 |
| 7 | Near gale | 28-33 |
| 8 | Gale | 34-40 |
| 9 | Strong gale | 41-47 |
Douglas Sea Scale
| Grade | Description | Height (m) |
|---|---|---|
| 0 | Calm (Glassy) | 0 |
| 1 | Calm (Rippled) | 0-0.1 |
| 2 | Smooth | 0.1-0.5 |
| 3 | Slight | 0.5-1.25 |
| 4 | Moderate | 1.25-2.5 |
| 5 | Rough | 2.5-4 |
| 6 | Very rough | 4-6 |
| 7 | High | 6-9 |
| 8 | Very high | 9-14 |
| 9 | Phenomenal | >14 |
KONTAK KAMI :
Jl. Angkasa I No.2 Kemayoran, Jakarta Pusat 10610, PO Box 3540 Jkt.
Call Center (021) 196
Fax (021) 4246703
cc196@bmkg.go.id
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