Bhubaneswar: After a hesitant start and uneven rainfall distribution during June, Odisha may be heading toward its most significant monsoon spell of the season around June 28, if meteorological indicators from the India Meteorological Department (IMD), NCMRWF deterministic models, and long-range convective forecasts pointing to a powerful synchronization of moisture, winds and atmospheric circulation over eastern India are to be believed.

The evolving weather pattern suggests that while rainfall activity may fluctuate over the next few days, conditions are steadily aligning for a widespread revival of the southwest monsoon across the state.

Monsoon Advancement Gains Momentum

According to IMD's latest seven-day forecast outlook, Odisha is expected to transition into a Fairly Widespread (FWS) rainfall phase between June 19 and June 20.

The forecast coincides with the IMD's assessment that atmospheric conditions remain favorable for the further advance of the southwest monsoon into additional parts of Odisha, Jharkhand, Bihar, Telangana and Chhattisgarh during the next four to five days.

The initial phase is likely to bring enhanced rainfall activity across the northern and coastal districts, including Balasore, Bhadrak, Mayurbhanj, Keonjhar, Jajpur, Kendrapara, Cuttack, Jagatsinghpur, Khordha, Puri, Ganjam and Gajapati.

Temporary Dip in Coverage From June 21

However, the monsoon revival is unlikely to be linear.

Between June 21 and June 24, the IMD forecast indicates a reduction in statewide rainfall coverage from Fairly Widespread to Scattered (SCT) conditions.

This does not imply a dry spell. Instead, rainfall is expected to become more localized and terrain-driven.

The southern highland districts of Koraput, Malkangiri, Rayagada, Nabarangpur and Kalahandi may witness intermittent showers and thunderstorms aided by orographic lifting, while interior districts such as Sambalpur, Jharsuguda, Bargarh, Sundargarh, Deogarh, Angul, Dhenkanal, Boudh, Sonepur, Bolangir, Nuapada, Kandhamal and Nayagarh are likely to experience scattered thunderstorm activity.

Atmospheric Signals Turn Strongly Positive After June 24

The bigger development begins around June 24, when long-range Outgoing Longwave Radiation (OLR) forecasts show a prominent band of negative OLR anomalies spreading across the Indian peninsula.

For meteorologists, negative OLR values are often a signature of deep cloud formation, vigorous convection and sustained rainfall activity.

The forecast suggests that dry mid-level air currently inhibiting widespread rainfall may gradually erode, allowing large cloud clusters to develop simultaneously over Odisha, central India and adjoining regions.

If this trend materializes, rainfall coverage could once again expand across virtually the entire state during the June 24–27 period.

June 28 Emerging as the Key Date

Weather models indicate that June 28 could mark the peak phase of this evolving monsoon episode.

Two critical atmospheric layers are expected to align over eastern India:

Powerful Moisture Conveyor at Lower Atmosphere

At the lower tropospheric level, a strong southwesterly wind stream is forecast to sweep across the Arabian Sea and the Indian peninsula.

Wind speeds ranging between 10 and 20 metres per second are projected over parts of peninsular India and adjoining seas.

This high-velocity moisture corridor will continuously transport moisture from the Arabian Sea across central India toward Odisha, creating an abundant supply of water vapour for rainfall generation.

Bay Cyclonic Vortex at 700 hPa

Simultaneously, model guidance shows a well-defined mid-level cyclonic circulation near the head of the Bay of Bengal, anchored southwest of Kolkata.

The system is expected to act as the principal lifting mechanism for the incoming moisture.

Meteorologists often describe such a setup as a highly efficient rainfall engine: lower-level winds transport moisture into the region, while the cyclonic circulation forces the moisture-laden air to rise, condense and produce extensive precipitation.

The interaction of these two features could result in widespread and locally heavy rainfall across Odisha by June 28.

Which Districts Could See the Strongest Impact?

Northern and Coastal Odisha

The districts most directly exposed to the Bay circulation's core rain bands are likely to be:

• Balasore
• Bhadrak
• Mayurbhanj
• Jajpur
• Kendrapara

These districts could witness prolonged periods of rain and embedded heavy spells if the cyclonic circulation remains positioned near the Bengal coast.

Southern and Southwestern Highlands

The moisture-laden southwesterly winds are expected to collide with the elevated terrain of:

• Koraput
• Malkangiri
• Rayagada
• Nabarangpur
• Kalahandi
• Gajapati

Such topographic interactions frequently enhance rainfall intensity, raising the possibility of heavy showers in the hill districts.

Central River Basin Districts

Districts situated between the northern rain bands and southern highlands – including Angul, Dhenkanal, Sambalpur, Sonepur, Boudh, Cuttack and adjoining areas – could experience sustained moderate to heavy rainfall as moisture gets channelled through the state's interior river basins.

Eastern India at the Centre of Monsoon Action

Odisha's rainfall resurgence is part of a larger monsoon-scale pattern unfolding across eastern India.

While Sub-Himalayan West Bengal and Sikkim are forecast to remain under widespread rainfall throughout the next seven days, Gangetic West Bengal is expected to see a steady increase in rainfall coverage and may eventually lie directly beneath the projected mid-level cyclonic vortex.

Meanwhile, moisture streams feeding Odisha are also expected to support active monsoon conditions over Jharkhand, Bihar and Chhattisgarh, creating a broad east-central Indian rainfall corridor.

Outlook

The next few days are likely to bring alternating phases of widespread and scattered rainfall across Odisha. However, all major forecast signals – from IMD rainfall distribution charts to OLR convective indicators and NCMRWF wind-field projections – suggest that the monsoon is preparing for a stronger push.

If the projected lower-level moisture surge and Bay of Bengal cyclonic circulation synchronize as currently indicated, Odisha could witness its most extensive and impactful monsoon spell of June around June 28, bringing much-needed rainfall to both coastal and interior districts.

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