Garmin G1000 Pilot’s Guide for the Socata TBM 850
190-00709-04 Rev. A
320
HAZARD AVOIDANCE
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:
• NEXRAD base reflectivity does not provide sufficient information to determine cloud layers or precipitation
characteristics. For example, it is not possible to distinguish between wet snow, wet hail, and rain.
• NEXRAD base reflectivity is sampled at the minimum antenna elevation angle. An individual NEXRAD
site cannot depict high altitude storms at close ranges. It has no information about storms directly over
the site.
• 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.
• Any unknown precipitation type below 52ºN is displayed as rain.
Figure 6-12 NEXRAD Data - Zoomed
Each block
covers an Area
of 4 sq. km
Summary of Contents for SOCATA TBM850
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