Quantcast Precipitation Display

 

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METEOROLOGY FLIGHT PLANNING
CHAPTER TWO
Figure 2-12 Oklahoma NEXRAD Display
While older weather radar show only basic displays, the NEXRAD system can display derived
products, such as composite reflectivity. This is the type of precipitation display most commonly
used in flight planning. A wind profile screen can also be displayed.
Precipitation Display
NEXRAD presentations show precipitation levels in the area scanned by the radar system. The
NEXRAD does not measure the rate of precipitation directly; rather, it measures the energy
return from the precipitation particles. The image seen on the screen is actually a computer-
generated compilation of returned energy shown in varying colors. This display is referred to as
the reflectivity presentation.
The intensity of precipitation can be determined by using the graduated scale shown in the legend
area of the screen (Figure 2-11). The maximum radar return strength at the time of the
presentation is listed above the scale. This is measured in "dbz," or strength in decibels, of the
energy received by the radar. Through use of this scale, precipitation strength can quickly be
deciphered for a given area by comparing the color of the area to the color-coded legend. Higher
precipitation levels are farther down the color scale. During flight planning, a pilot should
carefully analyze the higher intensity areas in relation to the planned route of flight or operating
area.
DATA DISPLAYED ON WEATHER IMAGERY PRODUCTS
2-13


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