Garmin GNC 420W Pilots Guide - Page 210

NEXRAD Intensity, Table 11-6, NEXRAD Intensity Colors

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SECTION 11 ADDITIONAL FEATURES 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 on the GNC 420 units using colors represented by the dBZ values listed in Table 11-6. Display dBZ Rain GDL 49 GDL 69 (inches/hour) 1 or sleet >1 or sleet sleet sleet Atmos Cloud Source of NEXRAD Echo Rain Snow Light Light Light Light Light - Moderate Moderate Heavy Heavy Intense Extreme Extreme Extreme Very Light Light Light Light Light Light - Medium Moderate Heavy Heavy Heavy Table 11-6 NEXRAD Intensity Colors Sleet Hail √ √ √ √ √ √ √ √ √ Large Large NOTE: The information presented in this Pilot's Guide regarding NEXRAD is not meant to be comprehensive. The NOAA website (www.noaa.gov) contains complete and detailed information regarding NEXRAD weather radar operation and theory. 11-20 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. K

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GNC 420(A) Pilot’s Guide and Reference
11-20
SECTION 11
ADDITIONAL FEATURES
190-00140-20
Rev. K
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 on the GNC 420 units using colors
represented by the dBZ values listed in Table 11-6.
Display
dBZ
Rain
(inches/hour)
Snow
(inches/hour)
Source of NEXRAD Echo
GDL 49
GDL 69
Atmos
Cloud
Rain
Snow
Sleet
Hail
<-10
.00
.00
√
-10
.00
.00
√
√
-5
.00
trace
√
√
0
.00
trace - .05
√
√
Very Light
GREEN
5
.00
trace - .10
√
√
Light
GREEN
10
0 – trace
.10
√
√
Light
Light
15
.01
.1-.2
Light
Light
20
.02
.2-.3
Light
Light
25
.05
.3-.5
Light
Light – Medium
YELLOW
YELLOW
30
.09
.5-.7
Light – Moderate
Moderate
35
.24
.7-1.0
Moderate
Heavy
√
40
.48
>1 or sleet
Heavy
Heavy
√
RED
RED
45
1.25
>1 or sleet
Heavy
Heavy
√
50
2.5
sleet
Intense
√
√
55
5.7
sleet
Extreme
√
√
60
12.7
Extreme
√
65
Extreme
√
70
Large
75
Large
Table 11-6
NEXRAD Intensity Colors
NOTE:
The information presented in this Pilot’s Guide regarding NEXRAD is not meant to be comprehensive.
The NOAA website (www.noaa.gov) contains complete and detailed information regarding NEXRAD weather
radar operation and theory.