ASOS station info can lag up to 2 minutes

Aviation International News » September 2001
May 9, 2008, 6:57 AM

Automated surface observation systems (ASOS) at airports without certified live weather observers have been a boon to pilots, but the information they dispense may be dangerously outdated. According to a warning from U.S. inspector general Kenneth Mead, visibility reports disseminated by the computer-generated voices at the 561 ASOS-equipped airports in the U.S. could be as much as 12 min out of date when weather conditions are changing rapidly. The information lag was first reported by the U.S. Air Force more than two years ago.

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