Indonesian Weather Bulletin for Shipping
( Metarea XI)

BMKG Jakarta, Wednesday 13 May 2026 At 0000 UTC

Part I : Warning

TROPICAL LOW 96W NEAR 8.1°U 138.2°E 1006 HPA MAXIMUM WINDS 20 KT MOVING TO NORTHWEST

Part II : General Synopsis

Tuesday 12 May 2026 at 12 UTC SOUTHEASTERLY TO SOUTHWESTERLY LIGHT TO GENTLE 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 Thursday 14 May 2026 at 00 UTC

MALACCA STRAIT

Northwesterly
6-10 kt
Slight Sea

INDIAN OCEAN WESTERN OF ACEH

Northerly
7-17 kt
Moderate Sea

INDIAN OCEAN WESTERN OF LAMPUNG

Southeasterly
9-16 kt
Rough Sea

INDIAN OCEAN SOUTHERN OF JAVA

Easterly
10-17 kt
Rough Sea

INDIAN OCEAN SOUTHERN OF BALI

Easterly
14-18 kt
Moderate Sea

NORTH NATUNA SEA

Northeasterly
3-11 kt
Slight Sea

KARIMATA STRAIT

Northeasterly
1-12 kt
Slight Sea

JAVA SEA

Southeasterly
9-17 kt
Slight Sea

MAKASSAR STRAIT

Easterly
5-18 kt
Moderate Sea

BALI SEA

Easterly
3-19 kt
Slight Sea

SUMBAWA SEA

Southeasterly
2-16 kt
Slight Sea

FLORES SEA

Easterly
3-19 kt
Moderate Sea

BANDA SEA

Easterly
3-20 kt
Moderate Sea

CERAM SEA

Easterly
3-13 kt
Slight Sea

SULAWESI SEA

Northeasterly
1-10 kt
Slight Sea

MOLLUCA SEA

Northerly
0-14 kt
Moderate Sea

WESTERN PART OF PACIFIC OCEAN

Easterly
5-14 kt
Moderate Sea

ARAFURA SEA

Easterly
6-23 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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