Hazard avoidance – Garmin G1000 King Air C90GT User Manual

Page 342

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Garmin G1000 Pilot’s Guide for the Hawker Beechcraft C90A/GT

190-00663-01 Rev. A

328

HAZARD AVOIDANCE

SY

STEM

O

VER

VIEW

FLIGHT

INSTRUMENTS

EIS

AUDIO P

ANEL

& CNS

FLIGHT

MANA

GEMENT

HAZARD

AV

OID

ANCE

AFCS

ADDITIONAL FEA

TURES

APPENDICES

INDEX

t

hUnDerstorms

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 are red or magenta.

Figure 6-50 Cell Irregularities

Steep Gradient

Squall Line

Hook or Finger

Scalloped Edge

Thunderstorm development is rapid. A course may become blocked within a short time. When displaying

shorter ranges, periodically select a longer range to see if problems are developing further out. That can
help prevent getting trapped in a blind alley or an area that is closed at one end by convective weather.

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