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Appendix E: Automated Surface Observing System Impact on the Climate Record
Pages 99-100

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From page 99...
... . The cool Conventional NWS wind measurements use a threetemperature bias of ASOS means that relative humidity cup design with a continuous output to drive a dial indiestimates are slightly higher than before, with seasonal cator or a strip chart recorder; ASOS uses a light chopper averages being one to three percent higher (McKee et rather than a voltage generator resulting in a lower startal., 1996b)
From page 100...
... average direction and speed inferred by an Manual observation of weather phenomena, includobserver watching a dial for one minute. Analysis of ing obstructions to vision, has been based on personal five-second wind averaging indicates ASOS peak winds interpretation of the human senses (NWS, 1994a)


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