Indonesian Weather Bulletin for Shipping
( Metarea XI)

BMKG Jakarta, Tuesday 18 March 2025 At 1430 UTC

Part I : Warning

GALE WARNING AT 12.0°S 98.9°E 1003 HPA MAXIMUM WIND SPEED 20KT MOVE TO SW

Part II : General Synopsis

Tuesday 18 March 2025 at 00 UTC NOTHERLY TO NORTHEASTERLY LIGHT TO MODERATE FLOW IN NOTHERN PART OF INDONESIA SOUTHWESTERLY TO NORTHWESTERLY LIGHT TO MODERATE FLOW IN SOUTHERN PART OF INDONESIA

Part III : Area Forecasts

Valid until Wednesday 19 March 2025 at 15 UTC

MALACCA STRAIT

Easterly
1-18 kt
Moderate Sea

INDIAN OCEAN WESTERN OF ACEH

Northerly
1-18 kt
Moderate Sea

INDIAN OCEAN WESTERN OF LAMPUNG

Northwesterly
13-26 kt
Moderate Sea

INDIAN OCEAN SOUTHERN OF JAVA

Northwesterly
13-29 kt
Moderate Sea

INDIAN OCEAN SOUTHERN OF BALI

Southwesterly
8-34 kt
Rough Sea

NORTH NATUNA SEA

Northeasterly
12-30 kt
Rough Sea

KARIMATA STRAIT

Northerly
1-30 kt
Moderate Sea

JAVA SEA

Westerly
1-33 kt
Moderate Sea

MAKASSAR STRAIT

Westerly
0-30 kt
Moderate Sea

BALI SEA

Northwesterly
2-23 kt
Slight Sea

SUMBAWA SEA

Westerly
1-28 kt
Moderate Sea

FLORES SEA

Westerly
4-26 kt
Moderate Sea

BANDA SEA

Northwesterly
1-30 kt
Moderate Sea

CERAM SEA

Northwesterly
3-20 kt
Slight Sea

SULAWESI SEA

Northeasterly
0-22 kt
Moderate Sea

MOLLUCA SEA

Northerly
0-25 kt
Moderate Sea

WESTERN PART OF PACIFIC OCEAN

Northerly
1-19 kt
Moderate Sea

ARAFURA SEA

Northwesterly
3-32 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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