Garmin G1000 Pilot’s Guide for the Socata TBM 850/900
190-00709-05 Rev. D
410
HAZARD AVOIDANCE
WEATHER MAPPING AND INTERPRETATION
WEATHER DISPLAY INTERPRETATION
When evaluating various target returns on the weather radar display, the colors denote precipitation
intensity and rates shown in the table.
Weather Mode Color
Intensity
Approximate
Precipitation Rate (in/hr.)
Black
< 23 dBZ
< .01.
Green
23 dBZ to < 32 dBZ
.01 - 0.1.
Yellow
32 dBZ to < 41 dBZ
0.1 - 0.5
Red (GWX 68)
41 dBZ to < 50 dBZ
0.5 - 2
Red (GWX 70)
41 dBz and greater
0.5 and greater
Magenta (GWX 68 only)
50 dBZ and greater
> 2
Table 6-11 Precipitation Intensity Levels (GWX 68 and GWX 70)
A precipitation intensity scale appears on the Weather Radar Page (Figure 6-102). The colors shown on the
scale correspond to the colors shown in Table 6-11.
NOTE:
The system does not display magenta for precipitation in GWX 70 installations, although magenta
appears on the scale in Weather mode.
Figure 6-102 Precipitation Intensity Scale on the Weather Radar Page
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Updrafts and downdrafts in thunderstorms carry water through the cloud. The more severe the drafts, the
greater the number and size of the precipitation droplets. With this in mind, the following interpretations
can be made from what is displayed on the weather radar. Avoid these areas by an extra wide margin.
• In areas where the displayed target intensity is red or magenta (indicating large amounts of precipitation),
the turbulence is considered severe.
• Areas that show steep color gradients (intense color changes) over thin bands or short distances suggest
irregular rainfall rate and strong turbulence.