Indonesian Weather Bulletin for Shipping
( Metarea XI)

BMKG Jakarta, Friday 16 May 2025 At 1200 UTC

Part I : Warning

NIL

Part II : General Synopsis

Friday 16 May 2025 at 00 UTC NORTHWESTERLY TO NORTHEASTERLY LIGHT TO GENTLE 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 Saturday 17 May 2025 at 12 UTC

MALACCA STRAIT

Westerly
5-40 kt
Moderate Sea

INDIAN OCEAN WESTERN OF ACEH

Westerly
10-32 kt
Moderate Sea

INDIAN OCEAN WESTERN OF LAMPUNG

Northwesterly
17-32 kt
Moderate Sea

INDIAN OCEAN SOUTHERN OF JAVA

Northwesterly
6-26 kt
Moderate Sea

INDIAN OCEAN SOUTHERN OF BALI

Easterly
26-39 kt
Moderate Sea

NORTH NATUNA SEA

Northeasterly
4-19 kt
Slight Sea

KARIMATA STRAIT

Easterly
5-15 kt
Smooth Sea

JAVA SEA

Southeasterly
10-26 kt
Slight Sea

MAKASSAR STRAIT

Easterly
5-34 kt
Slight Sea

BALI SEA

Easterly
6-26 kt
Slight Sea

SUMBAWA SEA

Southeasterly
6-34 kt
Slight Sea

FLORES SEA

Easterly
4-36 kt
Moderate Sea

BANDA SEA

Southeasterly
4-44 kt
Moderate Sea

CERAM SEA

Northeasterly
1-29 kt
Moderate Sea

SULAWESI SEA

Easterly
4-31 kt
Slight Sea

MOLLUCA SEA

Northwesterly
1-31 kt
Slight Sea

WESTERN PART OF PACIFIC OCEAN

Northeasterly
3-30 kt
Moderate Sea

ARAFURA SEA

Southeasterly
18-38 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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