4-71190-01102-02 Rev. B Garmin G500 Pilot’s GuideForewordSec 1SystemSec 2PFDSec 3MFDSec 4HazardAvoidanceSec 5AdditionalFeaturesSec 6Annun.& AlertsSec 7SymbolsSec 8Glossary Appendix AAppendix BIndexWeather ModeColorApproximateIntensityApproximateRainfall Rate(in/hr)BLACK < 23 dBZ < .01GREEN 23 dBZ to < 32 dBZ .01 - 0.1YELLOW 32 dBZ to < 41 dBZ 0.1 - 0.5RED 41 dBZ to < 50 dBZ 0.5 - 2MAGENTA 50 dBZ and greater > 2Table 4-17 Precipitation Intensity Levels4.8.5.2 ThunderstormsUpdrafts and downdrafts in thunderstorms carry water through the cloud.The more severe the drafts, the greater the number and size of the precipitationdroplets. With this in mind, the following interpretations can be made fromwhat is displayed on the weather radar. Avoid these areas by an extra widemargin.• In areas where the displayed target intensity is red or magenta (indicatinglarge amounts of precipitation), the turbulence is considered severe.• Areas that show steep color gradients (intense color changes) over thin bandsor short distances suggest irregular rainfall rate and strong turbulence.• Areas that show red or magenta are associated with hail or turbulence, aswell as heavy precipitation. Vertical scanning and antenna tilt managementmay be necessary to identify areas of maximum intensity.Along squall lines (multiple cells or clusters of cells in a line), individual cellsmay be in different stages of development. Areas between closely spaced, intensetargets may contain developing clouds not having enough moisture to producea return. However, these areas could have strong updrafts or downdrafts.Targets showing wide areas of green are generally precipitation without severeturbulence.Irregularities in the target return may also indicate turbulence, appearing as“hooks,” “fingers,” or “scalloped” edges. These irregularities may be present ingreen areas with no yellow, red, or magenta areas and should be treated as highlydangerous areas. Avoid these areas as if they were red or magenta areas.
