Nexrad intensity, Nexrad o – XM Satellite Radio GXM30 User Manual

Page 38

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32

GXM 30 XM Radio Smart Antenna Owner’s Manual

A

PPENDIX

>

NEXRAD O

VERVIEW

NEXRAD Intensity

Colors are used to identify the different

NEXRAD echo intensities (reflectivity)

measured in dBZ. (decibels of Z).

“Reflectivity” (designated by the letter Z) is

the amount of transmitted power returned to

the radar receiver. The dBZ values increase

as returned signal strength increases.

Precipitation intensity is displayed using

colors represented by the dBZ values listed

in the table to the right.

Display

Rain

Display

Snow

dBZ

Rain

(inches/hour)

Snow

(inches/hour)

Remarks

Rain

Snow

<-10

.00”

.00”

-10

.00”

.00”

-5

.00”

trace

0

.00”

trace - .05”

Very Light

5

.00”

trace - .10”

Light

10

0” - trace

.01”

Light

Light

15

.01”

.1 - .2”

Light

Light

20

.02”

.2 - .3”

Light

Light

25

.05”

.3 - .5”

Light

Light - Moderate

30

.09”

.5 - .7”

Light - Moderate

Moderate

35

.24”

.7 - 1.0”

Moderate

Heavy

40

.48”

1” + or sleet

Heavy

Heavy

45

1.25”

1” + or sleet

Heavy

Heavy

50

2.5”

sleet

Intense

55

5.7”

sleet

Extreme

55+

12.7”

Extreme

The information presented in this manual is not

meant to be comprehensive. The NOAA web

site contains complete and detailed information

regarding NEXRAD weather radar operation

and theory. You can visit them at

www.noaa.gov.

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