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[IDD #LSK-251795]: Re: IDD and cloud cover in METARs

> Jeff, thanks for the information. How is the measurement made?

Well, back in the old days ;) it was done by the forecaster...now many have 
automated that process. That will be defined in the report:

The abbreviation âAUTOâ is included in any METAR/SPECI which includes 
observations recorded without human input. Where no cloud is detected in such a 
report, the letters âNCDâ will be included and in most cases, when a cloud 
base recorder does not detect any cloud and the recorded visibility is 1000 
metres or less, the phrase âCLD:SKY MAY BE OBSCâ will be included as a 

So, automated weather stations will use either LIDAR or a ceilometer currently 
and earlier (years) attempt at automation used an optical drum recorder...

Hope this helps, 

Jeff Weber
Unidata User Support

Ticket Details
Ticket ID: LSK-251795
Department: Support IDD
Priority: Normal
Status: Open

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