Foreword

 

Sec 1 System

 

Sec 2 PFD

 

Sec 3 MFD

Sec 4

Hazard Avoidance

Sec 5

Additional Features

Sec 6

Annun. & Alerts

 

Sec 7 Symbols

 

Sec 8 Glossary

 

Appendix A

 

Appendix B Index

 

GWX 68 Radars

3rd Party Radars

Weather Mode

Approximate

Approximate

Radar Return Level

Color

Rainfall Rate

(see radar documen-

Intensity

 

(in/hr)

tation for details)

 

 

Black

< 23 dBZ

< .01

0

Green

23 dBZ to < 32 dBZ

.01 - 0.1

1

Yellow

32 dBZ to < 41 dBZ

0.1 - 0.5

2

Red

41 dBZ to < 50 dBZ

0.5 - 2

3

Magenta

50 dBZ and greater

> 2

4

 

 

 

 

Table 4-22 Precipitation Intensity Levels

4.10.5.2Thunderstorms

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.

Areas that show red or magenta are associated with hail or turbulence, as well as heavy precipitation. Vertical scanning and antenna tilt management may be necessary to identify areas of maximum intensity.

Along squall lines (multiple cells or clusters of cells in a line), individual cells may be in different stages of development. Areas between closely spaced, intense targets may contain developing clouds not having enough moisture to produce a return. However, these areas could have strong updrafts or downdrafts. Targets showing wide areas of green are generally precipitation without severe turbulence.

Irregularities in the target return may also indicate turbulence, appearing as “hooks,” “fingers,” or “scalloped” edges. These irregularities may be present in green areas with no yellow, red, or magenta areas and should be treated as highly dangerous areas. Avoid these areas as if they were red or magenta areas.

4-88

Garmin G600 Pilot’s Guide

190-00601-02 Rev. E

Page 248
Image 248
Garmin G600 manual Thunderstorms, Precipitation Intensity Levels