BADAN METEOROLOGI,
KLIMATOLOGI DAN GEOFISIKA
Indonesian Weather Bulletin for Shipping
( Metarea XI)
BMKG Jakarta, Tuesday 21 April 2026 At 0600 UTC
Part I : Warning
NIL
Part II : General Synopsis
Monday 20 April 2026 at 12 UTC NORTHWEST TO NORTHEASTERLY GENTLE TO FRESH FLOW IN THE NORTHERN PART OF INDONESIA NORTHEAST TO SOUTHEASTERLY MODERATE TO STRONG FLOW IN THE SOUTHERN PART OF INDONESIA
Part III : Area Forecasts
Valid until Wednesday 22 April 2026 at 06 UTC
MALACCA STRAIT
Northerly
0-5 kt
Smooth Sea
INDIAN OCEAN WESTERN OF ACEH
Northwesterly
1-8 kt
Moderate Sea
INDIAN OCEAN WESTERN OF LAMPUNG
Easterly
8-12 kt
Moderate Sea
INDIAN OCEAN SOUTHERN OF JAVA
Easterly
9-15 kt
Moderate Sea
INDIAN OCEAN SOUTHERN OF BALI
Easterly
6-15 kt
Moderate Sea
NORTH NATUNA SEA
Easterly
1-10 kt
Slight Sea
KARIMATA STRAIT
Northerly
0-9 kt
Slight Sea
JAVA SEA
Northeasterly
1-11 kt
Slight Sea
MAKASSAR STRAIT
Easterly
2-13 kt
Slight Sea
BALI SEA
Easterly
4-9 kt
Slight Sea
SUMBAWA SEA
Easterly
7-13 kt
Slight Sea
FLORES SEA
Easterly
7-14 kt
Slight Sea
BANDA SEA
Easterly
3-12 kt
Slight Sea
CERAM SEA
Northeasterly
2-11 kt
Slight Sea
SULAWESI SEA
Easterly
12-18 kt
Moderate Sea
MOLLUCA SEA
Northeasterly
3-15 kt
Rough Sea
WESTERN PART OF PACIFIC OCEAN
Easterly
4-11 kt
Moderate Sea
ARAFURA SEA
Easterly
2-17 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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