BADAN METEOROLOGI,
KLIMATOLOGI DAN GEOFISIKA
Indonesian Weather Bulletin for Shipping
( Metarea XI)
BMKG Jakarta, Monday 20 April 2026 At 0600 UTC
Part I : Warning
NIL
Part II : General Synopsis
Sunday 19 April 2026 at 12 UTC NORTHEAST TO SOUTHEASTERLY LIGHT TO MODERATE FLOW IN THE NORTHERN PART OF INDONESIA EAST TO SOUTHEASTERLY GENTLE TO FRESH FLOW IN THE SOUTHERN PART OF INDONESIA
Part III : Area Forecasts
Valid until Tuesday 21 April 2026 at 06 UTC
MALACCA STRAIT
Northwesterly
3-8 kt
Slight Sea
INDIAN OCEAN WESTERN OF ACEH
Northwesterly
2-11 kt
Moderate Sea
INDIAN OCEAN WESTERN OF LAMPUNG
Easterly
8-17 kt
Moderate Sea
INDIAN OCEAN SOUTHERN OF JAVA
Easterly
11-17 kt
Moderate Sea
INDIAN OCEAN SOUTHERN OF BALI
Easterly
6-17 kt
Moderate Sea
NORTH NATUNA SEA
Easterly
5-12 kt
Slight Sea
KARIMATA STRAIT
Northerly
0-11 kt
Slight Sea
JAVA SEA
Easterly
4-11 kt
Slight Sea
MAKASSAR STRAIT
Northeasterly
2-9 kt
Slight Sea
BALI SEA
Northeasterly
2-12 kt
Slight Sea
SUMBAWA SEA
Easterly
1-11 kt
Slight Sea
FLORES SEA
Northeasterly
3-13 kt
Slight Sea
BANDA SEA
Northeasterly
1-11 kt
Smooth Sea
CERAM SEA
Northeasterly
3-10 kt
Smooth Sea
SULAWESI SEA
Easterly
8-16 kt
Moderate Sea
MOLLUCA SEA
Northeasterly
4-14 kt
Rough Sea
WESTERN PART OF PACIFIC OCEAN
Easterly
4-10 kt
Moderate Sea
ARAFURA SEA
Northeasterly
1-13 kt
Slight 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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