Indonesian Weather Bulletin for Shipping
( Metarea XI)

BMKG Jakarta, Thursday 30 April 2026 At 1800 UTC

Part I : Warning

NIL

Part II : General Synopsis

Thursday 30 April 2026 at 12 UTC NORTHEAST TO SOUTHEASTERLY LIGHT TO FRESH FLOW IN THE NORTHERN PART OF INDONESIA NORTHEAST TO SOUTHEASTERLY LIGHT TO FRESH FLOW IN THE SOUTHERN PART OF INDONESIA

Part III : Area Forecasts

Valid until Friday 01 May 2026 at 18 UTC

MALACCA STRAIT

Easterly
5-8 kt
Smooth Sea

INDIAN OCEAN WESTERN OF ACEH

Northwesterly
1-12 kt
Moderate Sea

INDIAN OCEAN WESTERN OF LAMPUNG

Southeasterly
6-14 kt
Rough Sea

INDIAN OCEAN SOUTHERN OF JAVA

Southeasterly
12-17 kt
Rough Sea

INDIAN OCEAN SOUTHERN OF BALI

Southeasterly
9-17 kt
Rough Sea

NORTH NATUNA SEA

Easterly
5-13 kt
Slight Sea

KARIMATA STRAIT

Northeasterly
1-8 kt
Slight Sea

JAVA SEA

Northeasterly
6-12 kt
Slight Sea

MAKASSAR STRAIT

Northeasterly
4-12 kt
Slight Sea

BALI SEA

Easterly
2-14 kt
Slight Sea

SUMBAWA SEA

Easterly
3-12 kt
Slight Sea

FLORES SEA

Easterly
1-14 kt
Slight Sea

BANDA SEA

Southeasterly
1-17 kt
Moderate Sea

CERAM SEA

Easterly
1-13 kt
Slight Sea

SULAWESI SEA

Northeasterly
1-12 kt
Slight Sea

MOLLUCA SEA

Westerly
1-11 kt
Moderate Sea

WESTERN PART OF PACIFIC OCEAN

Northerly
0-9 kt
Moderate Sea

ARAFURA SEA

Southeasterly
5-17 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

ForceDescriptionSpeed (knots)
0Calm< 1
1Light air1-3
2Light breeze4-6
3Gentle breeze7-10
4Moderate breeze11-16
5Fresh breeze17-21
6Strong breeze22-27
7Near gale28-33
8Gale34-40
9Strong gale41-47

Douglas Sea Scale

GradeDescriptionHeight (m)
0Calm (Glassy)0
1Calm (Rippled)0-0.1
2Smooth0.1-0.5
3Slight0.5-1.25
4Moderate1.25-2.5
5Rough2.5-4
6Very rough4-6
7High6-9
8Very high9-14
9Phenomenal>14
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