Instrument Flight Rules UTC Weather 
AeroSavvy
JANUARY 16, 2024
The lights change color to indicate weather conditions based on METAR reports via internet. Either way, METAR is a format for reporting weather observations. ASOS (Automated Surface Observing System) or older AWOS (Automated Weather Observing System) stations automatically collect the data used in METARs. Take your pick.
Pilot Institute
MAY 25, 2024
The start and end dates and times are coded in YYMMDDttt format (UTC time). B) 2106231700 is the start time and date in UTC. C) 2106232300 is the end time and date in UTC. These include changes made to instrument approaches, STARs, SIDs, and IFR airways. Each subject has its own FAA keyword. CLSD is the Condition: Closed.
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