Nexrad - Garmin GTN 625 Pilot's Manual

11.1.5

NEXRAD

WSR-88D, or NEXRAD (NEXt-generation RADar), is a network of 158 high-
resolution Doppler radar systems that are operated by the National Weather
Service (NWS). NEXRAD data provides centralized meteorological information
for the continental United States and selected overseas locations. The maximum
range of a single NEXRAD radar site is 250 NM. The NEXRAD network provides
important information about severe weather for air traffic safety.
NEXRAD data is not real-time. The lapsed time between collection,
processing, and dissemination of NEXRAD images can be significant and may
not reflect the current radar synopsis. Due to the inherent delays and the relative
age of the data, it should be used for long-range planning purposes only. Never
use NEXRAD data for maneuvering in, near, or around areas of hazardous
weather. Instead, use it in an early-warning capacity of pre-departure and en
route evaluation.
Composite data from all the NEXRAD radar sites in the United States is
shown. This data is composed of the maximum reflectivity from the individual
radar sweeps. The display of the information is color-coded to indicate the
weather severity level.
NOTE: Due to similarities in color schemes, the display of Echo Tops cannot
be shown with Cloud Tops and NEXRAD.
1. While viewing the Datalink Weather menu, touch the NEXRAD
key to step through the NEXRAD selections.
NEXRAD
Weather
2. Repeated touches to the NEXRAD key will toggle between
the Off, US, and Canada selections.
190-01004-03 Rev. F
Figure 11-8 NEXRAD Weather
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