How DWR works

Down to Earth - - SPECIAL REPORT -

Dop­pler Weather Radar (DWR) is a unique re­mote sens­ing weather sur­veil­lance tool, which con­sists of a trans­mit­ter, a re­ceiver and an an­tenna. The trans­mit­ter emits beams (pulses) of mi­crowave en­ergy into the at­mos­phere. When th­ese beams col­lide with ob­jects in the at­mos­phere, such as rain­drops, hail­stones, snowflakes or cloud droplets, some of the en­ergy bounces back to the radar. The re­ceiver at the radar then col­lects the re­flected en­ergy and dis­plays it in dif­fer­ent ways. The an­tenna sends the in­for­ma­tion to an­other source to be pro­cessed and dis­played to me­te­o­rol­o­gists and the gen­eral public.

PHO­TO­GRAPHS: RE­GIONAL ME­TE­O­RO­LOG­I­CAL CEN­TRE, MUM­BAI

(Above) The Dop­pler radar in Mum­bai was in­stalled on

top of Ar­chana build­ing in Navy Na­gar in 2011; (Left) The

radar can pre­dict weather events, like the 2005 floods in Mum­bai, six hours in ad­vance

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