Pilot’s Guide for the Cirrus SR2x with Cirrus Perspective by Garmin
190-00820-11 Rev. A
400
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
NOTE:
If the system has not received all available NEXRAD weather data (such as during initial FIS-B signal
acquisition or in areas of marginal or poor signal reception), the system may display areas of no radar
coverage which are subsequently removed as radar data is received. It may take up to approximately ten
minutes to receive all FIS-B data, when adequate reception is available.
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:
• At a map range of 30 nm or less, individual blocks of NEXRAD weather data are viewable. For the
regional version of the NEXRAD weather product, each block is 1.5 nm wide by 1 nm tall. For the
continental United States version of the NEXRAD weather product, each block is 7.5 nm wide by 5 nm
wide.
• The continental US version of the NEXRAD weather product is not available above 60º of latitude.
• Preciptiation occuring below the radar beam will not be detected.
The following may cause abnormalities in displayed NEXRAD radar images:
• Ground clutter
• Strobes and spurious radar data
• Sun strobes (when the radar antenna points directly at the sun)
• Interference from buildings or mountains, which may cause shadows
• Metallic dust (chaff) from military aircraft, which can cause alterations in radar scans
SIGMETS AND AIRMETS
SIGMETs (SIGnificant METeorological Information) and AIRMETs (AIRmen’s METeorological Information)
are issued for potentially hazardous weather. A Convective SIGMET is issued for hazardous convective
weather such as severe or widespread thunderstorms. A localized SIGMET can be displayed when significant
weather conditions are not widespread.
The entire SIGMET or AIRMET is shown as long as any portion of it is issued within the selected coverage
area of the Connext Data Request.
Содержание CIRRUS PERSPECTIVE SR2x
Страница 2: ......
Страница 6: ...Pilot s Guide for the Cirrus SR2x with Cirrus Perspective by Garmin 190 00820 11 Rev A Blank Page...
Страница 751: ......