Assessment of Nexrad Coverage and Associated Weather Services (1995) / Chapter Skim
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2 Radar Network Configuration and Detection Capabilities
2 Radar Network Configuration and Detection Capabilities
Pages 8-35
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From page 8... ...
The pre-NEXRAD radars routinely scanned only at low elevation angles in the surveillance mode and were operated manually for other scans, such as vertical scans in the range-height indicator mode. Figure 2-la indicates the composite coverage provided by the pre-NEXRAD network at 10,000 ft above site level over the contiguous United States and bordering greasy Here "coverage" means that the lower edge of the radar beam.
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From page 9... ...
O 185 1OLOl~l_TERS ~n) Figure 2-lb Composite NEXRAD coverage at 10,000 ft above site level for the contiguous United States and the locations of NWS and DoD sites.
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From page 11... ...
The NEXRAD network will be capable of detecting tall storms anywhere in the contiguous United States and in most of the 230-km bordering area. Specifically, any storm reaching a height of at least 26,000 ft above site level will extend through at least the lower half of the beam of some NEXRAD in the network (scanning at the lowest elevation angle)
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From page 12... ...
Table 2-} describes the characteristics (top, limiting horizontal extent, and reflectivity) that the panel used to calculate the maximum ranges at which various weather phenomena can be detected.
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From page 13... ...
The spread of maximum range values shown within the brackets under the "Experience" column represents differences caused by seasonal, geographic, and meteorological factors. The number in front of the bracket is a subjective estimate of a median maximum range value that would be applicable within the contiguous United States.
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From page 14... ...
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From page 15... ...
To No A A o on Go ~4 ~o ° =° ~A Go ~o o ~A Go ~ ~o to ~A No on o o o i,, in, An.
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From page 16... ...
The number In front of the brackets is the estimated median, deemed here as the "expenenced~ median maximum range. NC = No Capability.
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From page 17... ...
and [typical maximum range valuesl -74C NEXRAD Winds boundary layer NC NC 103 NC (warm season) high surface winds with preeip.
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From page 18... ...
COMPARISON OF DETECTION COVERAGE BY PRE NEXRAD AND NEXRAD NETWORKS The median values of the maximum detection range for each radar under the "Experience" column of Table 2-2 were used to prepare maps showing national detection coverage for both the preNEXRAD and NEXRAD networks for selected weather phenomena. Maps were also prepared indicating those areas where the pre-NEXRAD network afforded better coverage for each phenomenon.
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From page 19... ...
The pie chart shows the percentage of vulnerable areas (contiguous United States + 230 km across borders or oceans within the marked boundary) where only the NEXRAD network provides this coverage (dotted red)
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From page 21... ...
The pie chart shows the percentage of vulnerable areas (contiguous United States + 230 km across borders or oceans) where only the NEXRAD network provides this coverage (dotted red)
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From page 23... ...
The pie chart shows the percentage of vulnerable areas (contiguous United States + 230 km across borders or oceans) where only the NEXRAD network provides this coverage (dotted red)
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From page 25... ...
The coverage extent of each individual radar in the two networks is taken from the median values of the "experience" maximum range values from Table 2-2. The pie chart shows the percentage of vulnerable areas (contiguous United States + 230 km across borders or oceans)
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From page 27... ...
The pie chart shows the percentage of vulnerable areas (contiguous United States only, within marked boundary) where only the NEXRAD network provides this coverage (dotted red)
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From page 29... ...
The pie chart shows the percentage of vulnerable areas (contiguous United States + 230 km across borders or oceans within boundary lines shown) where only the NEXRAD network provides this coverage (dotted red)
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From page 31... ...
values are used for supercell detection. The corresponding difference chart in Figure 2-8b shows that the potentially degraded areas of supercell detection coverage by NEXRAD for the contiguous United States are reduced substantially when the maximum NEXRAD capability threshold is used.
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From page 32... ...
Without these 15 radars, Here would be more geographic regions in Be contiguous United States where radar-detection capability may be degraded. ~ These 15 NEXRAD sites are East Alabama, Alabama; Beale and March, California; Dover, Delaware; NW Florida, Florida; Moody and Robins, Georgia; Ft Pole, Louisiana; Columbus, Mississippi; Minot, North Dakota; Frederick and Vance, Oklahoma; Central Texas, Dyess, and Laughlin, Texas.
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From page 33... ...
The coverage extent of each individual radar in the two networks is taken from He higher values of Be ~experience" median maximum range values from Table 2-2. The pie chart shows the percentage of vulnerable areas (contiguous United States + 230~ km across borders or oceans)
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From page 35... ...
Full-capability access is also needed for the four forecast offices that will provide service using two NWS NEXRADs to cover an extended service area.) Coverage by the 15 DoD NEXRADs referred to previously is needed as part of Be overall national detection coverage for significant weather.
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