Aviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2004-09-30T00:00:000.6500Aviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2005-09-30T00:00:000.6300Aviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2006-09-30T00:00:000.6400Aviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2007-09-30T00:00:000.4000.45001.125ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2008-09-30T00:00:000.39000.44001.12821ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2009-09-30T00:00:000.39000.44001.12821ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2010-09-30T00:00:000.38000.43001.13158ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2011-09-30T00:00:000.36000.42001.16667ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2012-09-30T00:00:000.39000.4001.02564ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2013-09-30T00:00:000.37000.38001.02703ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2014-09-30T00:00:000.36000.38001.05556ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2015-09-30T00:00:000.34000.38001.11765ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2016-09-30T00:00:000.38000.38001MetAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2017-09-30T00:00:000.37000.38001.02703ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2018-09-30T00:00:000.35000.38001.08571ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2019-09-30T00:00:000.33000.38001.15152ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2020-09-30T00:00:000.33000.38001.15152ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2021-09-30T00:00:000.36000.38001.05556ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2022-09-30T00:00:000.37000.38001.02703ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2023-09-30T00:00:000.36000.38001.06ExceededAviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2024-09-30T00:00:000.3800Aviation ceiling/visibility forecast false alarm ratio Instrument Flight Rules (%)2025-09-30T00:00:000.3800