CHAPTER 4
ASPEN ADS
-B IN
ADS-B Pilot’s Guide
Page 4-14
091-00057-001 REV A
NEXRAD weather surveillance can detect most precipitation within 80 nm, and intense
rain or snow within 140 nm, of the radar. NEXRAD measures moisture in DBz or decibels
of Z, with Z representing the reflection back to the radar. NEXRAD does not report
precipitation below 20 DBz.
Each weather product has an age limit and is usually updated at the Update Rate
indicated in the Table 4-3.
Weather Product
Update Interval (Min)
CONUS NEXRAD
15
Regional NEXRAD
1-2
METAR
1
20
AIRMET’S
1
20
SIGMET’S
1
20
PIREP
1
20
Winds & Temp aloft
1
12 hr
Table 4-3
Weather Product update Frequency
1. Not available on PFD
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