What does BMD Great Danger Signal No. 10 signify?

BMD Signal No. 10 indicates a severe or extremely severe cyclone will cross directly over or near the coastal port.

Which months see peak cyclone activity in the Bay of Bengal?

Peak cyclonogenesis in the Bay of Bengal occurs during pre-monsoon (April-May) and post-monsoon (October-November) transition windows.

Bay of Bengal Cyclonogenesis ObservationBMD & IMD Marine Standards

Cyclone Tracker & Bay of Bengal Radar

Real-time satellite observation evaluating atmospheric pressure, oceanic thermal energy, wave heights, and official BMD warning signals.

BMD Marine Alert Status

Normal (No Active Signals)

Cyclone & Marine Official ReportNormal

Bay of Bengal Cyclone & Marine Alert Status

BMD Warning Signal

No Signal (Normal)

Meteorological Summary

Currently, there are no active tropical cyclonic disturbances or low-pressure systems developing over the Bay of Bengal. Synoptic observations indicate stable atmospheric pressure patterns across the northern bay and coastal region. Sea surface temperatures remain within seasonal thresholds with moderate wave activity. Maritime operations and coastal activities can proceed under normal seasonal guidelines.

Coastal Advisory

Fishermen and maritime vessels operating in the Bay of Bengal and coastal areas are advised to navigate with routine caution.

Sea Surface Temperature28.5°C (Normal)

Max Wave Height (Deep Sea)1.2 meters

Wind Speed (Coastal)15-20 km/h

Data based on BMD (Bangladesh Meteorological Department) maritime advisories and marine observations.

Live Marine Weather & Wind Streamlines

Depression

Cautionary

Wind Speed:31 knots (< 61 km/h)

Deep Depression

Moderate

Wind Speed:32–38 knots (62–74 km/h)

Cyclonic Storm

High

Wind Speed:39–47 knots (75–88 km/h)

Severe Cyclonic Storm

Very High

Wind Speed:48–63 knots (89–117 km/h)

Very Severe Cyclonic Storm

Severe Danger

Wind Speed:64–89 knots (118–165 km/h)

Extremely Severe Cyclonic Storm

Extreme Danger

Wind Speed:90–119 knots (166–220 km/h)

Super Cyclonic Storm

Catastrophic

Wind Speed:≥ 120 knots (≥ 222 km/h)

Classification	Maximum Sustained Wind Speed	Threat Category
Depression	31 knots (< 61 km/h)	Cautionary
Deep Depression	32–38 knots (62–74 km/h)	Moderate
Cyclonic Storm	39–47 knots (75–88 km/h)	High
Severe Cyclonic Storm	48–63 knots (89–117 km/h)	Very High
Very Severe Cyclonic Storm	64–89 knots (118–165 km/h)	Severe Danger
Extremely Severe Cyclonic Storm	90–119 knots (166–220 km/h)	Extreme Danger
Super Cyclonic Storm	≥ 120 knots (≥ 222 km/h)	Catastrophic

Official BMD 1-11 Maritime Warning Signal Guide

Distant Cautionary Signal

A depression has formed in the distant sea area.

Distant Warning Signal

A deep depression/cyclone has formed in deep sea.

Local Cautionary Signal

Port is threatened by squally weather.

Local Warning Signal

Port is threatened by a cyclonic storm.

Danger Signal (Port Left)

Moderate cyclone will cross leaving port to left.

Danger Signal (Port Right)

Moderate cyclone will cross leaving port to right.

Danger Signal (Over Port)

Cyclone will cross over or near the port.

Great Danger Signal (Port Left)

Severe cyclone will cross leaving port to left.

Great Danger Signal (Port Right)

Severe cyclone will cross leaving port to right.

Great Danger Signal (Over Port)

Severe cyclone will cross directly over the port.

Failure of Communications

Complete breakdown of warning communication.

Signal	Warning Signal Title	Description & Advisory
1	Distant Cautionary Signal	A depression has formed in the distant sea area.
2	Distant Warning Signal	A deep depression/cyclone has formed in deep sea.
3	Local Cautionary Signal	Port is threatened by squally weather.
4	Local Warning Signal	Port is threatened by a cyclonic storm.
5	Danger Signal (Port Left)	Moderate cyclone will cross leaving port to left.
6	Danger Signal (Port Right)	Moderate cyclone will cross leaving port to right.
7	Danger Signal (Over Port)	Cyclone will cross over or near the port.
8	Great Danger Signal (Port Left)	Severe cyclone will cross leaving port to left.
9	Great Danger Signal (Port Right)	Severe cyclone will cross leaving port to right.
10	Great Danger Signal (Over Port)	Severe cyclone will cross directly over the port.
11	Failure of Communications	Complete breakdown of warning communication.

Science of Bay of Bengal Cyclonogenesis

The Bay of Bengal is prone to intense cyclonogenesis due to shallow waters and high Sea Surface Temperatures (SST > 26.5°C). The Coriolis force between 5°N and 20°N latitude imparts rotational momentum to tropical disturbances.

The funnel-shaped coastline of Bangladesh combined with a shallow continental shelf amplifies storm surge hydrodynamics, raising coastal sea levels by 3 to 8 meters during landfall.

Coastal Community Preparedness Protocol

Move immediately to cyclone shelters upon signal #8-10 broadcasts.
Store dry food, portable drinking water, flashlights, and battery radios in emergency bags.
Fishing boats and ocean vessels must dock at inland harbors immediately.

Why BMD Cyclone Signals & Satellite Radar Monitoring Matter

Bangladesh's long coastline along the Bay of Bengal makes it susceptible to pre-monsoon and post-monsoon tropical cyclones. Abohawa provides real-time wave physics, satellite imagery, and BMD maritime alerts to protect coastal livelihoods.