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By National Research Council, Division on Engineering and Physical Sciences, Commission on Engineering and Technical Systems, National Weather Service Modernization Committee

Nationwide climate carrier Modernization Committee, fee on Engineering and Technical structures, department on Engineering and actual Sciences, nationwide examine Council

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Extra resources for Continuity of NOAA Satellites

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Please use the print version of this publication as the authoritative version for attribution. ENSURING CONTINUITY 36 The current POES ground system consists of two major subsystems: the polar acquisition and control subsystem (PACS) and the central environmental satellite computer system (CEMSCS). The PACS components are located at two CDA stations near Wallops Island, Virginia, and Fairbanks, Alaska; at the SOCC; and at a western European station near Lannion, France. PACS includes all components necessary to command and control the spacecraft, to monitor the health of the spacecraft using housekeeping telemetry, and to retrieve and transmit environmental data to the CEMSCS.

The launch-decision process is schedule driven, from call up until a satellite is in orbit and operational. Another satellite must be available to replace one that fails. It now takes nearly two years to call up, launch, and check out a GOES, if one is available on the ground. More than a year of this time is required for scheduling and launching a GOES using current commercial launch services. Thus, it appears that only a standby GOES satellite in orbit can ensure that there is no interruption of coverage.

The analysis grid has a resolution of approximately 90 km over North America and 200 km elsewhere. The NGM forecasts are for 16 layers and a two-grid nested system out to 48 hours. The forecast grids have approximate resolution of 170 and 85 km at 45 degrees north latitude and a resolution of 320 km for the hemispheric grid. Model output statistics from the NGM are produced twice a day for more than 700 locations in the United States for a wide range of weather elements, such as maximum/minimum temperature, surface wind speed and direction, probability of precipitation, cloud ceiling height, visibility, and similar data.

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