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Dvorak Technique of Weather Forecasting

Note4Students

From UPSC perspective, the following things are important :

Prelims level : Dvorak Technique

Mains level : Weather forecasting

Recently, the American meteorologist Vernon Dvorak passed away at the age of 100 who pioneered the widely used Dvorak Technique.

Who was Vernon Dvorak?

  • Dvorak was an American meteorologist best credited for developing the Dvorak (read as Do-rak) technique in the early 1970s.
  • The technique helps forecast the tropical storm.
  • His technique has saved the lives of millions of people across the world and will continue to do so.

What is the Dvorak technique?

  • The Dvorak technique was first developed in 1969 and tested for observing storms in the northwest Pacific Ocean.
  • Forecasters used the available satellite images obtained from polar orbiting satellites to examine the features of the developing tropical storms (hurricanes, cyclones and typhoons).
  • During day time, images in the visible spectrum were used while at night, the ocean would be observed using infrared images.
  • It was a cloud pattern recognition technique based on a concept model of the development and decay of the tropical cyclone.

Why is technique still widely in use?

  • Unlike land, ocean observations in the 1970s were sparse.
  • Today, there continues to be an improved network of land-based meteorological observations, either in the form of taking manual observations, installing automatic weather stations or automatic rain gauges.
  • On the other hand, ocean observations still remain limited.
  • There are many vast regions across the four oceans that have not been fully examined with meteorological instruments.
  • Ocean observations are mostly taken by deploying buoys or dedicated ships, but the number of observations from the seas is still not sufficient across the world.
  • That is why meteorologists have had to depend more on satellite-based imageries, and combine it with the available ocean-data at the time of forecasting the intensity and wind speed of the tropical cyclones.

 

 

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