Garmin G500 Pilot's Manual page 230

Steep Gradient
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.
In areas of multiple heavy cells, use the Vertical Scan feature along with
antenna tilt management to examine the areas. Remember to avoid shadowed
areas behind targets.
4-72
Figure 4-62 Cell Irregularities
Figure 4-63 The "Blind Alley" Overhead View
Figure 4-64 The "Blind Alley" Horizontal Scan
Garmin G500 Pilot's Guide
Squall Line
Hook or Finger
Scalloped Edge
190-01102-02 Rev. E