ESS124
Prof. Jin-Yi Yu
Surface Measurements: ASOS/AWOS
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• Automated Surface (Weather) Observing Systems (ASOS or AWOS) are now used to make standard measurements of atmospheric properties  at most location in North America.
• The measurements are reported hourly in North America and every three hours worldwide, at 0000, 0300, 0600, 0900, 1200, 1500, 1800, and 2100 UTC.