BADAN METEOROLOGI,
KLIMATOLOGI DAN GEOFISIKA
Indonesian Weather Bulletin for Shipping
( Metarea XI)
BMKG Jakarta, Tuesday 21 July 2026 At 0000 UTC
Part I : Warning
TROPICAL LOW AT 13.0N 134.6E 8.8°E 1007 HPA MAXIMUM WINDS 15 KT MOVING TO W
Part II : General Synopsis
Monday 20 July 2026 at 12 UTC SOUTHEASTERLY TO SOUTHWESTERLY LIGHT TO FRESH FLOW IN THE NORTHERN PART OF INDONESIA EASTERLY TO SOUTHEASTERLY LIGHT TO STRONG FLOW IN THE SOUTHERN PART OF INDONESIA
Part III : Area Forecasts
Valid until Wednesday 22 July 2026 at 00 UTC
MALACCA STRAIT
Northwesterly
2-10 kt
Smooth Sea
INDIAN OCEAN WESTERN OF ACEH
Northwesterly
1-11 kt
Moderate Sea
INDIAN OCEAN WESTERN OF LAMPUNG
Southeasterly
17-20 kt
Rough Sea
INDIAN OCEAN SOUTHERN OF JAVA
Southeasterly
17-20 kt
Rough Sea
INDIAN OCEAN SOUTHERN OF BALI
Southeasterly
13-19 kt
Moderate Sea
NORTH NATUNA SEA
Westerly
4-14 kt
Slight Sea
KARIMATA STRAIT
Easterly
7-14 kt
Slight Sea
JAVA SEA
Southeasterly
11-17 kt
Slight Sea
MAKASSAR STRAIT
Southeasterly
5-18 kt
Moderate Sea
BALI SEA
Easterly
4-19 kt
Slight Sea
SUMBAWA SEA
Southeasterly
2-16 kt
Slight Sea
FLORES SEA
Easterly
4-17 kt
Moderate Sea
BANDA SEA
Southeasterly
3-19 kt
Moderate Sea
CERAM SEA
Southeasterly
2-20 kt
Moderate Sea
SULAWESI SEA
Westerly
1-13 kt
Slight Sea
MOLLUCA SEA
Northwesterly
3-18 kt
Moderate Sea
WESTERN PART OF PACIFIC OCEAN
Northwesterly
1-15 kt
Moderate Sea
ARAFURA SEA
Southeasterly
9-19 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
| Force | Description | Speed (knots) |
|---|---|---|
| 0 | Calm | < 1 |
| 1 | Light air | 1-3 |
| 2 | Light breeze | 4-6 |
| 3 | Gentle breeze | 7-10 |
| 4 | Moderate breeze | 11-16 |
| 5 | Fresh breeze | 17-21 |
| 6 | Strong breeze | 22-27 |
| 7 | Near gale | 28-33 |
| 8 | Gale | 34-40 |
| 9 | Strong gale | 41-47 |
Douglas Sea Scale
| Grade | Description | Height (m) |
|---|---|---|
| 0 | Calm (Glassy) | 0 |
| 1 | Calm (Rippled) | 0-0.1 |
| 2 | Smooth | 0.1-0.5 |
| 3 | Slight | 0.5-1.25 |
| 4 | Moderate | 1.25-2.5 |
| 5 | Rough | 2.5-4 |
| 6 | Very rough | 4-6 |
| 7 | High | 6-9 |
| 8 | Very high | 9-14 |
| 9 | Phenomenal | >14 |
KONTAK KAMI :
Jl. Angkasa I No.2 Kemayoran, Jakarta Pusat 10610, PO Box 3540 Jkt.
Call Center (021) 196
Fax (021) 4246703
cc196@bmkg.go.id
TAUTAN :
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