IMD warns of Heavy to very heavy rainfall warning in several states over the coming days as a massive cloud system spanning nearly 10,000 kilometres has drawn attention across Asia.
A vast 10,000 km monsoon rain cloud band, visible in satellite imagery, reflects the large-scale atmospheric conditions driving widespread rainfall across the region. The massive weather system stretching nearly 10,000 kilometres from India to South Korea has captured attention across Asia, offering a dramatic picture of the ongoing southwest monsoon.
The development comes as the India Meteorological Department (IMD) has issued fresh forecasts of heavy to very heavy rainfall over several parts of the country. According to the latest weather bulletin, the active monsoon phase is expected to continue over many regions, with some areas also facing the risk of extremely heavy rainfall, thunderstorms and strong winds.
IMD forecasts heavy rain in several states
The IMD has warned that heavy rainfall is likely across parts of western, central, eastern and northeastern India during the coming days. Gujarat, Maharashtra, Odisha, Bihar, Jharkhand, West Bengal and several northeastern states are among the regions expected to receive significant rainfall, while parts of the Himalayan region may also witness intense showers.
Authorities have also cautioned that isolated areas could experience flash floods, waterlogging, landslides and disruptions to transport services as the active monsoon continues. Residents in vulnerable districts have been advised to stay updated with local weather advisories.
Why the 10,000 km Monsoon rain cloud matters
The 10,000 km monsoon rain cloud is not a single rainstorm but a vast band of moisture and cloud cover associated with monsoon circulation extending across large parts of Asia. Such extensive cloud formations indicate strong moisture transport and favourable atmospheric conditions that can sustain widespread rainfall over several regions simultaneously.
Meteorologists note that these large-scale systems are common during active monsoon periods, although cloud bands of this scale are visually striking in satellite imagery and often coincide with enhanced rainfall activity.
Active monsoon likely to continue
The IMD‘s extended outlook suggests that the monsoon trough is expected to remain near its normal position over the coming days, helping maintain favourable conditions for rainfall across several parts of the country. Weather systems developing over adjoining regions are also expected to support continued monsoon activity through the week.
People living in flood-prone and hilly areas have been advised to monitor official weather updates, avoid unnecessary travel during periods of intense rainfall and follow instructions issued by local authorities.
How large monsoon cloud bands form over Asia
Large cloud formations during the southwest monsoon develop when warm, moisture-rich air rises and interacts with broader atmospheric circulation. The Asian monsoon carries substantial moisture from surrounding seas towards the land, creating conditions favourable for widespread cloud development and rainfall.
A cloud band extending across thousands of kilometres does not mean that the entire region will receive the same amount of rain. Rainfall depends on the movement of the monsoon trough, local pressure patterns, wind flow, topography and smaller weather systems embedded within the larger circulation.
Satellite imagery can make these systems particularly striking because it captures cloud cover across a much wider area than conventional ground-based observations. Meteorologists therefore use satellite observations along with rainfall measurements, radar data and numerical weather models to assess the potential impact of such weather systems.
Why heavy rainfall can increase flood and landslide risks
Periods of intense monsoon rainfall can create different risks depending on the geography of an area. Low lying urban locations may experience waterlogging when rainfall exceeds the capacity of drainage systems. Rivers and streams can also rise rapidly when substantial rain falls across their catchment areas.
Hilly and mountainous regions face an additional risk from slope instability. Prolonged or intense rainfall can saturate soil and increase the possibility of landslides, particularly in areas with steep terrain.
Flash flooding can develop quickly in some locations, leaving limited time for residents to respond. For this reason, rainfall warnings are important not only for people in areas expected to receive the highest rainfall but also for districts located downstream of heavy rain zones.
How the IMD rainfall categories help understand the forecast
The IMD uses specific rainfall categories to communicate the expected intensity of precipitation. Understanding these categories helps readers interpret weather warnings more accurately.
Heavy rainfall generally refers to rainfall between 64.5 mm and 115.5 mm in 24 hours, while very heavy rainfall refers to 115.6 mm to 204.4 mm. Rainfall of 204.5 mm or more in 24 hours is classified as extremely heavy rainfall.
These classifications describe rainfall recorded over a 24-hour period and do not mean that rain will necessarily fall continuously throughout that period. Local forecasts and district-level warnings provide more useful information for immediate planning.
What people should monitor during an active monsoon spell
When the monsoon becomes particularly active, residents should follow the latest forecasts rather than relying solely on a broad regional warning. Weather conditions can change considerably between districts, especially in areas influenced by mountains, coastlines and river systems.
People in vulnerable locations should monitor IMD updates, local administration advisories and emergency alerts. During periods of intense rainfall, unnecessary movement through flooded roads, streams and low lying areas can increase risks.
Travellers should also check weather and transport updates before starting journeys, particularly when forecasts indicate heavy or very heavy rainfall. The large cloud formation provides an important visual indication of widespread atmospheric activity, but local rainfall forecasts remain the most relevant information for individual districts and cities.
