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Author: Alan R. Bohne
Publisher:
ISBN:
Category : Cloud forecasting
Languages : en
Pages : 106
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Book Description
A methodology for real-time operations has been developed for the short-term forecasting of cloud and precipitation fields. Pattern recognition techniques are employed to extract useful features from the data field and extrapolation techniques are used to project these features into the future. To reduce computational load, contours defined by directional codes are used to delineate features. These contours are subdivided and attributes such as length, location, and location of each segment are determined. Segment matching is performed for successive observations and attribute changes are monitored over time. Several techniques for the forecasting of attributes have been explored, and an exponential smoothing filter and a linear trend adaptive smoothing filter have been chosen as most appropriate. Currently analysis is performed on a minicomputer and image processor system utilizing radar reflectivity data. Refinement of these techniques and extension into a more comprehensive short term forecasting program is planned.
Author: Alan R. Bohne
Publisher:
ISBN:
Category : Cloud forecasting
Languages : en
Pages : 106
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Book Description
A methodology for real-time operations has been developed for the short-term forecasting of cloud and precipitation fields. Pattern recognition techniques are employed to extract useful features from the data field and extrapolation techniques are used to project these features into the future. To reduce computational load, contours defined by directional codes are used to delineate features. These contours are subdivided and attributes such as length, location, and location of each segment are determined. Segment matching is performed for successive observations and attribute changes are monitored over time. Several techniques for the forecasting of attributes have been explored, and an exponential smoothing filter and a linear trend adaptive smoothing filter have been chosen as most appropriate. Currently analysis is performed on a minicomputer and image processor system utilizing radar reflectivity data. Refinement of these techniques and extension into a more comprehensive short term forecasting program is planned.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 392
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Book Description
Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 962
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Book Description
Author:
Publisher:
ISBN:
Category : Electronic journals
Languages : en
Pages : 444
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1110
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Book Description
Author: United States. Congress. House. Committee on Appropriations. Subcommittee on the Departments of Commerce, Justice, and State, the Judiciary, and Related Agencies
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 2012
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Book Description
Author: United States. Congress. House. Committee on Appropriations. Subcommittee on the Departments of Commerce, Justice, and State, the Judiciary, and Related Agencies
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1722
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Book Description
Author: K Boulding
Publisher: Routledge
ISBN: 100000984X
Category : Political Science
Languages : en
Pages : 275
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Book Description
A collection of 14 proceedings for the Symposium on western water resources: coming problems and the policy alternatives, held in Denver, CO, USA, on the 27 Sep 1979.
Author: Canadian Meteorological and Oceanographic Society
Publisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 188
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Book Description
Author: H. Stuart Muench
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 46
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Book Description
A previously developed advection forecast technique was modified to include data extracted from satellite imagery. A forecast experiment was then conducted using a data base gathered at AFGL during March 1984. This experiment was designed to test the usefulness of : (a) 3-hour forecast updates, (b) a biquadratic interpolation, and (c) cloud and precipitation information from satellite imagery. The test results confirmed earlier tests in that advection using space-averaged 500-mb winds produced the best overall scores and that in general the scores for 1 - 15 hours were better than persistence. The age of the advection flow (3, 6 or 9 hours old) did not affect forecast score, making updates useful. The biquadratic interpolation procedure produced better fits to observation than bilinear and appears to have improved forecasts. There was but a small benefit from adding satellite information to surface observations when forecasting cloud cover and hourly precipitation. the difficulties of trying to forecast even 30 to 50 percent of the time-change variance suggest that alternative approaches such as mesoscale modeling will be needed for accurate, reliable short-range forecasts.
