BADAN METEOROLOGI,
KLIMATOLOGI DAN GEOFISIKA
Indonesian Weather Bulletin for Shipping
( Metarea XI)
BMKG Jakarta, Wednesday 20 May 2026 At 1800 UTC
Part I : Warning
Nil.
Part II : General Synopsis
Wednesday 20 May 2026 at 12 UTC NORTHWESTERLY TO NORTHEASTERLY LIGHT TO MODERATE FLOW IN NORTHERN PART OF INDONESIA NORTHEASTERLY TO SOUTHEASTERLY LIGHT TO FRESH FLOW IN SOUTHERN PART OF INDONESIA
Part III : Area Forecasts
Valid until Thursday 21 May 2026 at 18 UTC
MALACCA STRAIT
Northeasterly
4-7 kt
Slight Sea
INDIAN OCEAN WESTERN OF ACEH
Westerly
7-18 kt
Rough Sea
INDIAN OCEAN WESTERN OF LAMPUNG
Northwesterly
1-13 kt
Moderate Sea
INDIAN OCEAN SOUTHERN OF JAVA
Northerly
4-12 kt
Moderate Sea
INDIAN OCEAN SOUTHERN OF BALI
Easterly
4-13 kt
Rough Sea
NORTH NATUNA SEA
Northeasterly
2-13 kt
Slight Sea
KARIMATA STRAIT
Northerly
4-12 kt
Slight Sea
JAVA SEA
Easterly
7-13 kt
Slight Sea
MAKASSAR STRAIT
Easterly
2-17 kt
Slight Sea
BALI SEA
Easterly
5-13 kt
Slight Sea
SUMBAWA SEA
Easterly
11-15 kt
Slight Sea
FLORES SEA
Easterly
6-17 kt
Slight Sea
BANDA SEA
Easterly
2-19 kt
Moderate Sea
CERAM SEA
Easterly
1-17 kt
Moderate Sea
SULAWESI SEA
Easterly
1-8 kt
Slight Sea
MOLLUCA SEA
Westerly
1-13 kt
Moderate Sea
WESTERN PART OF PACIFIC OCEAN
Westerly
1-14 kt
Moderate Sea
ARAFURA SEA
Southeasterly
9-21 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
TAUTAN :
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