Financial Daily from THE HINDU group of publications
Monday, Mar 07, 2005

Port Info

Group Sites

Industry & Economy - Climate & Weather

Summer showers break the dry spell in Kerala

Vinson Kurian

The State receives approximately 40 cm of rain during the season that often merges into the pre-monsoon showers.

Thiruvananthapuram , March 6

CONVECTIVE rain or summer showers have announced their arrival to more or less clockwork precision with many parts in the State, especially the South, recording moderate to heavy rain during the three days ending Saturday.

The capital city went through alternate spells of showers and bright sun, a distinctive feature associated with the season, on Sunday. According to Mr M.D. Ramachandran, Director, Met Office, Thiruvananthapuram, the rain activity has commenced at least a week in advance of what has traditionally been considered the normal.

The State receives approximately 40 cm of rain during the season that often merges into the pre-monsoon showers in due course. It had a bountiful summer shower season in the previous year that also saw the southwest monsoon break at least 10 days ahead of normal.

But that was purely coincidental, and there is nothing to suggest a one-to-one correlation ensuring success of the seasons that follow one after the other.

By their very definition, summer rains are purely localised phenomenon resulting from the convection of moisture into the air that rises from an overheated land.

Heating of the land till well past the noon hours would cause the moisture-laden air to rise vertically into the atmosphere and form what are called the convective-type clouds. These cloud formations can rise to as high as 10 km straight up.

Due to the nil or negligible wind activity during this season, these formations would not move from their resting place. Once sufficiently cooled, the formation gives itself away in the form of showers with associated thunder activity.

It tends to occur in the latter part of the day or early evening. Because land warms faster than the sea, this type of rain is far more common over land.

Even sudden and sustained outbursts, called cloudbursts, are commonplace during this season with showers giving way to heavy downpour, running up to seven to eight cm in measure and confined to a given area.

A chain of such thundercloud formations, or `cells' in Met jargon, can link practically the length of the State during this season. This goes to explain the often `wide-spread' nature of these `localised' rains.

The district-level forecasts by the National Centre for Medium Range Weather Forecasting (NCMRWF) also indicate that the State will continue to experience showers of varied duration during the days ahead.

The Centre had rightly forecast a peak in rain activity on Saturday (March 5). The next peak has been forecast for March 8 (Tuesday) in the latest five-day forecast.

The Weather Watch report dated March 3 issued by the Department of Agriculture and Cooperation said the all-India cumulative seasonal rainfall recorded from January 1 till February 24 was above normal by 81 per cent.

In the southern peninsula, it was in excess by 25 per cent. The northwest region has run up a huge 111 per cent surplus during the ongoing season.

Article E-Mail :: Comment :: Syndication :: Printer Friendly Page

Stories in this Section
Summer showers break the dry spell in Kerala

Lottery Bill in current session
Most liked feature of Budget in Delhi is I-T reforms: Survey
Survey sees CEOs bullish on GDP growth
`System to monitor impact of tourism on ecology vital'
Vizag Pharma City gets Environment Ministry approval
NPCIL's first 540 MW generation unit ready
NTPC's nuclear power plans
MERC spikes plan to restrict supply to agri customers
State Finance Ministers' meet today on VAT
Draft VAT rules to be on Web site in Bengal
AP traders, officials debate VAT
VAT will raise tax base, reduce prices: Moily
`Incentives will help textile sector grow'
For a stich in time
NCERT bodies hold school curriculum review meetings
FICCI moots cluster approach to improve labour productivity
`Basic infrastructure vital to woo FDI'
Bill for industries support fund
Agenda for the week

The Hindu Group: Home | About Us | Copyright | Archives | Contacts | Subscription
Group Sites: The Hindu | Business Line | The Sportstar | Frontline | The Hindu eBooks | The Hindu Images | Home |

Copyright 2005, The Hindu Business Line. Republication or redissemination of the contents of this screen are expressly prohibited without the written consent of The Hindu Business Line