Indonesian Weather Bulletin for Shipping
( Metarea XI)

BMKG Jakarta, Thursday 23 October 2025 At 0600 UTC

Part I : Warning

TC FENGSHEN AT 17.0°N 108.0°E 1006HPA MAXIMUM WIND 30 KNOT MOVE TO SW LOW PRESSURE AREA 97W AT 19.7°N 121.3°E 1006HPA MAXIMUM WIND 30 KNOT MOVE TO SW

Part II : General Synopsis

Wednesday 22 October 2025 at 12 UTC SOUTHWESTERLY TO NORTHWESTERLY GENTLE TO FRESH FLOW IN THE NORTHERN PART OF INDONESIA EASTERLY TO SOUTHEASTERLY GENTLE TO MODERATE LOW IN THE SOUTHERN PART OF INDONESIA

Part III : Area Forecasts

Valid until Friday 24 October 2025 at 06 UTC

MALACCA STRAIT

Northwesterly
15-19 kt
Moderate Sea

INDIAN OCEAN WESTERN OF ACEH

Northwesterly
5-13 kt
Moderate Sea

INDIAN OCEAN WESTERN OF LAMPUNG

Northeasterly
1-10 kt
Moderate Sea

INDIAN OCEAN SOUTHERN OF JAVA

Southeasterly
3-15 kt
Moderate Sea

INDIAN OCEAN SOUTHERN OF BALI

Easterly
6-11 kt
Moderate Sea

NORTH NATUNA SEA

Westerly
2-17 kt
Moderate Sea

KARIMATA STRAIT

Southwesterly
6-17 kt
Moderate Sea

JAVA SEA

Northerly
1-9 kt
Moderate Sea

MAKASSAR STRAIT

Northerly
1-9 kt
Slight Sea

BALI SEA

Easterly
2-10 kt
Slight Sea

SUMBAWA SEA

Northeasterly
0-8 kt
Slight Sea

FLORES SEA

Northeasterly
0-10 kt
Slight Sea

BANDA SEA

Easterly
1-14 kt
Slight Sea

CERAM SEA

Northerly
1-11 kt
Slight Sea

SULAWESI SEA

Westerly
1-12 kt
Moderate Sea

MOLLUCA SEA

Northwesterly
1-10 kt
Moderate Sea

WESTERN PART OF PACIFIC OCEAN

Northerly
1-10 kt
Moderate Sea

ARAFURA SEA

Easterly
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

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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