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Bengaluru, Jun 5: The much awaited Southwest Monsoon entered Karnataka with widespread rain in coastal and central regions of the southern state, an official said on Friday. Rain and thundershowers are likely to occur at most places over coastal areas and at a few places over the interior parts over the next 24-48 hours.

"The southwest monsoon entered the state on Thursday as predicted from Kerala and the Arabian Sea, with moderate to heavy rainfall in the coastal districts and central or Malnad region of the state," Karnataka State Natural Disaster Monitoring Centre Director Srinivas Reddy told media here.

Though the monsoon has set in on time in the state, Reddy said its progress was likely to be slow in the next three days, as cyclone Nisarga induced high-speed winds took away rain-bearing clouds from the southern peninsula.

According to the regional meteorological office, Karwar in Uttar Kannada district received a whopping 15cm rainfall on Thursday, followed by 11cm each at Kundapur in Udupi district and Shivamogga in Malnad region.

Kadra and Gersoppa in Uttara Kannada and Kottigehara in Chikkamagaluru district had 10cm rainfall, followed by 8cm at Virajpet in Kodagu district and 7cm each at Shirali and Gokarana in Uttara Kannda.

Isolated to scattered rainfall also occurred in many places across the north and south interior regions of the state.

"The monsoon will advance in the state to south and north interior areas after June 8 as there is lull in its movement due to lack of rain-bearing clouds and winds to carry them," said Reddy.

Noting that the four-month monsoon from June to September, crucial to the rain-dependent state would be normal this year, Reddy said its progress and spread, however, would depend on various factors like cloud formations and wind movements.

"Conditions are likely to become favourable for monsoon advancement in the state over the next 2-3 days," asserted Reddy.

The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study