The Hindu Business Line : Heat wave sizzles as seas brace to catch up

There has been no significant let-up in heat wave conditions over large parts of the country even as leading weather models pointed towards a wet spell enveloping the peninsular seas from later this week.

Though meteorologists wouldn’t call it the southwest monsoon just yet, indications are that a weather-setting Madden-Julian Oscillation (MJO) wave would have got into active mode over the Arabian Sea and the Bay of Bengal from as early as mid-week this week.

MODEL DIVERGENCE

Statistical MJO model projections say the rains would become established from May 9 onwards and last until May 20 or so when the influence of the MJO wave is shown as waning. But some dynamical models are not in agreement with this scenario.

The MJO wave is a periodically phenomenon showing up in the Indian Ocean as it travels eastward from the African continent onward to the Pacific and beyond.

It has alternating wet and dry phases and has been known to spark monsoon onsets, intra-seasonal excess rains (wet MJO phase) as well as the lean monsoon phase better known as ‘break monsoon’ (dry MJO phase).

HEAT WAVE ALERT

Meanwhile, India Meteorological Department (IMD) has extended its heat wave warning for two more days as a severe heat wave sat smack over east Rajasthan, east Madhya Pradesh and Vidarbha on Friday.

The IMD warning said severe heat wave conditions are likely over parts of Rajasthan during the next two days.

Heat wave conditions have also been forecast over Madhya Pradesh, Chhattisgarh, Vidarbha and Delhi; parts of Himachal Pradesh, Punjab, Haryana, south Uttar Pradesh, north madhya Maharashtra, interior Orissa, Jharkhand and Jammu division of Jammu and Kashmir.

International models continued to forecast flare-ups to still higher levels over the Marathwada-Vidarbha-interior Orissa belt.

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