Indonesian Weather Bulletin for Shipping
( Metarea XI)

BMKG Jakarta, Thursday 04 June 2026 At 0000 UTC

Part I : Warning

Nil

Part II : General Synopsis

Wednesday 03 June 2026 at 12 UTC SOUTHEASTERLY TO SOUTHWESTERLY GENTLE TO STRONG FLOW IN THE NORTHERN PART OF INDONESIA SOUTHEASTERLY TO SOUTHWESTERLY GENTLE TO FRESH FLOW IN THE SOUTHERN PART OF INDONESIA

Part III : Area Forecasts

Valid until Friday 05 June 2026 at 00 UTC

MALACCA STRAIT

Northerly
3-9 kt
Slight Sea

INDIAN OCEAN WESTERN OF ACEH

Southwesterly
2-19 kt
Moderate Sea

INDIAN OCEAN WESTERN OF LAMPUNG

Southeasterly
7-13 kt
Rough Sea

INDIAN OCEAN SOUTHERN OF JAVA

Southeasterly
11-16 kt
Rough Sea

INDIAN OCEAN SOUTHERN OF BALI

Easterly
10-15 kt
Rough Sea

NORTH NATUNA SEA

Westerly
4-16 kt
Slight Sea

KARIMATA STRAIT

Southeasterly
7-15 kt
Slight Sea

JAVA SEA

Southeasterly
9-16 kt
Slight Sea

MAKASSAR STRAIT

Easterly
3-16 kt
Slight Sea

BALI SEA

Easterly
2-16 kt
Slight Sea

SUMBAWA SEA

Southeasterly
3-14 kt
Slight Sea

FLORES SEA

Easterly
5-18 kt
Moderate Sea

BANDA SEA

Southeasterly
4-20 kt
Moderate Sea

CERAM SEA

Southeasterly
2-18 kt
Moderate Sea

SULAWESI SEA

Northwesterly
1-10 kt
Slight Sea

MOLLUCA SEA

Westerly
2-15 kt
Slight Sea

WESTERN PART OF PACIFIC OCEAN

Northwesterly
3-13 kt
Moderate Sea

ARAFURA SEA

Southeasterly
11-17 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

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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