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Pilot’s Guide for the Cirrus SR2x with Cirrus Perspective by Garmin
190-00820-11 Rev. A
334
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
The display of No Radar Coverage is always active when either NEXRAD or ECHO TOPS is selected. Areas
where NEXRAD radar coverage and Echo Tops information is not currently available or is not being collected
are indicated in a gray shade of purple.
r
eflectiVity
Reflectivity is the amount of transmitted power returned to the radar receiver. Colors on the NEXRAD
display are directly correlative to the level of detected reflectivity. Reflectivity as it relates to hazardous
weather can be very complex.
The role of radar is essentially to detect moisture in the atmosphere. Simply put, certain types of weather
reflect radar better than others. The intensity of a radar reflection is not necessarily an indication of the
weather hazard level. For instance, wet hail returns a strong radar reflection, while dry hail does not. Both
wet and dry hail can be extremely hazardous.
The different NEXRAD echo intensities are measured in decibels (dB) relative to reflectivity (Z). NEXRAD
measures the radar reflectivity ratio, or the energy reflected
back to
the radar receiver (designated by the
letter Z). The value of Z increases as the returned signal strength increases.
neXrad l
iMitationS
NEXRAD radar images may have certain limitations:
• Undetermined precipitation types may be displayed as mixed.
• An individual NEXRAD site cannot depict high altitude storms at close ranges. It has no information
about storms directly over the site.
• Preciptiation may be occuring below the lowest antenna tilt angle (0.5
º
), and therefore the radar beam
overshoots the precipitation. For example, at a distance of 124 miles from the radar site, the radar beam
is approximately 18,000 feet above the radar site. The radar cannot detect any precipitation occuring
below the beam at this distance and altitude.
• When zoomed in to a range of 30 nm, each square block on the display represents an area of four square
kilometers. The intensity level reflected by each square represents the
highest
level of NEXRAD data
sampled within the area (Figure 6-12).
• Unknown precipitation below 52ºN is displayed as rain regardless of actual precipitation type.
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