3
GXM 30A XM Radio Smart Antenna Owner’s Manual
a
PPendIX
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neXrad o
vervIeW
NEXRAD Intensity
Colors are used to identify the different
NEXRAD echo intensities (reflectivity)
measured in dBZ. (decibels of Z).
“Reflectivity” (designated by the letter Z) is
the amount of transmitted power returned to
the radar receiver. The dBZ values increase
as returned signal strength increases.
Precipitation intensity is displayed using
colors represented by the dBZ values listed
in the table to the right.
Display
Rain
Display
Snow
dBZ
Rain
(inches/hour)
Snow
(inches/hour)
Remarks
Rain
Snow
<-10
.00”
.00”
-10
.00”
.00”
-5
.00”
trace
0
.00”
trace - .05”
Very Light
5
.00”
trace - .10”
Light
10
0” - trace
.01”
Light
Light
15
.01”
.1 - .2”
Light
Light
20
.02”
.2 - .3”
Light
Light
25
.05”
.3 - .5”
Light
Light - Moderate
30
.09”
.5 - .7”
Light - Moderate
Moderate
35
.24”
.7 - 1.0”
Moderate
Heavy
40
.48”
1” + or sleet
Heavy
Heavy
45
1.25”
1” + or sleet
Heavy
Heavy
50
2.5”
sleet
Intense
55
5.7”
sleet
Extreme
55+
12.7”
Extreme
The information presented in this manual is not
meant to be comprehensive. The NOAA web
site contains complete and detailed information
regarding NEXRAD weather radar operation
and theory. You can visit them at
www.noaa.gov.
Summary of Contents for GXM 30 - XM Smart Antenna
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