Indonesian Weather Bulletin for Shipping
( Metarea XI)

BMKG Jakarta, Tuesday 14 October 2025 At 0600 UTC

Part I : Warning

NIL.

Part II : General Synopsis

Monday 13 October 2025 at 12 UTC SOUTHEASTERLY TO SOUTHWESTERLY GENTLE TO MODERATE FLOW IN THE NORTHERN PART OF INDONESIA EASTERLY TO SOUTHEASTERLY GENTLE TO FRESH FLOW IN THE SOUTHERN PART OF INDONESIA

Part III : Area Forecasts

Valid until Wednesday 15 October 2025 at 06 UTC

MALACCA STRAIT

Southeasterly
9-11 kt
Slight Sea

INDIAN OCEAN WESTERN OF ACEH

Northwesterly
1-10 kt
Moderate Sea

INDIAN OCEAN WESTERN OF LAMPUNG

Easterly
11-19 kt
Rough Sea

INDIAN OCEAN SOUTHERN OF JAVA

Southeasterly
14-18 kt
Rough Sea

INDIAN OCEAN SOUTHERN OF BALI

Southeasterly
6-13 kt
Rough Sea

NORTH NATUNA SEA

Northeasterly
7-12 kt
Slight Sea

KARIMATA STRAIT

Northeasterly
3-13 kt
Slight Sea

JAVA SEA

Easterly
8-14 kt
Slight Sea

MAKASSAR STRAIT

Easterly
3-13 kt
Slight Sea

BALI SEA

Easterly
3-16 kt
Moderate Sea

SUMBAWA SEA

Easterly
2-12 kt
Slight Sea

FLORES SEA

Easterly
2-13 kt
Slight Sea

BANDA SEA

Southeasterly
2-16 kt
Slight Sea

CERAM SEA

Northeasterly
1-11 kt
Slight Sea

SULAWESI SEA

Northwesterly
1-8 kt
Slight Sea

MOLLUCA SEA

Westerly
2-12 kt
Moderate Sea

WESTERN PART OF PACIFIC OCEAN

Westerly
2-10 kt
Moderate Sea

ARAFURA SEA

Easterly
5-18 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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