CONUS and Regional NEXRAD
Medium and high altitude FIS-B towers broadcast CONUS precipitation radar for the
Continental United States (CONUS). Regional NEXRAD is broadcast by all tower tiers and is
higher resolution than CONUS NEXRAD with a faster refresh rate.
To display ADS-B NEXRAD, select the Radar (Composite) map layer. Radar (Lowest Tilt)
data is not broadcast via FIS-B or able to be packed. As a result, Radar (Lowest Tilt) is not
selectable when connected to an ADS-B receiver.
ForeFlight receives updated CONUS NEXRAD every 5 minutes. FIS-B towers refresh CONUS
NEXRAD data every 15 minutes. Regional NEXRAD is refreshed every 2 minutes. On clear
days when there are no radar returns, Regional NEXRAD is refreshed every 10 minutes.
Regional NEXRAD is automatically displayed within the look-ahead range (150 nm to 250 nm
based on tower tier). CONUS NEXRAD is displayed beyond the Regional NEXRAD look-
ahead range. As you fly across the country, the radar returns will automatically change from
CONUS to higher resolution Regional NEXRAD as you get within the look-ahead range.
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