Download or read book An Automated Real time Storm Analysis and Storm Tracking Program WEATRK written by Carlton J. Bjerkaas and published by . This book was released on 1980 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolution of the WEATRK system is described from the original software obtained under contract in 1977, to the present software configuration. The various portions of the software are discussed with emphasis on the algorithms used to determine storm significance and establish the storm track. Results of the two-year development effort and operational tests show the usefulness of assimilating large amounts of complex data and generating a computer-synthesized product easily used in forecast applications. The error analysis performed on the storm track forecast accuracy suggests that few of the errors encountered are due to meteorological effects but they are largely due to parameters such as beam width, pulse width, antenna rotation rate and rounding errors. The non-meteorological errors appear to average out over large data sets; that is, the longer the storm track the smaller the forecast error. Although the program now uses a three-dimensional analysis, very little analysis is performed on the velocity and variance fields. The usefulness of these fields along with other improvements are considered.
Download or read book An Evaluation of an Automatic Cell Detection and Tracking Algorithm written by James G. Wieler and published by . This book was released on 1982 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: A storm tracking algorithm designed to detect and track fine structure in digitized radar data is evaluated. These fine structures are defined by regions containing values within 3 dB of peaks in reflectivity factor. The algorithm describes storm structure and evolution by correlating these peak regions in time and space. The evaluation consists of a comparison of the algorithm output with raw data and with output from an AFGL algorithm which detects and tracks three-dimensional reflectivity weighted centroids defined by a preselected threshold. It is concluded that the algorithm cannot reliably detect and track significant structures within storms when applied to data sets with a temporal resolution of aprox. 6 min and a spatial resolution of 1.0 deg in azimuth and 0.7 deg in elevation. The significance of tracking 3 dB peaks is questioned and the implication of defining a larger peak threshold is discussed. The algorithm does track the large features of storms with results similar to the AFGL algorithm. However, it does not run in real time and is not modular, unlike the AFGL algorithm.
Download or read book Next Generation Weather Radar NEXRAD written by and published by . This book was released on 1986 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Doppler Radar Meteorological Observations WSR 88D products and algorithms written by and published by . This book was released on 1990 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Joint Agency Doppler Technology Tests written by Ralph J. Donaldson and published by . This book was released on 1980 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Joint Doppler Operational Project was a cooperative inter-agency program directed toward the evaluation of recent advances in Doppler weather radar technology for operational applications by the participating agencies. The first two years of testing demonstrated the decisive superiority of Doppler techniques, in comparison with conventional methods, for reliable identification and early warning of tornadoes and other severe thunderstorm hazards. During the final year, the program evaluated the format and effectiveness of manually aided automatic display products transmitted in near-real time to operational agencies remotely located from the radar. Experiences of operating personnel utilizing these new techniques provide input toward system definition of NEXRAD, the Next Generation Weather Radar network now under development. One of the most encouraging examples of the enhanced warning capability realized by the remote transmission of the automated Doppler format was a successful forecast of severe weather for an Air Force Base which was a crucial factor in saving a fleet of aircraft from severe hail damage.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1981 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1981 with total page 1370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book The Fortieth Anniversary History of Weather Radar Research in the U S Air Force written by James I. Metcalf and published by . This book was released on 1989 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Force Surveys in Geophysics written by and published by . This book was released on 1989 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NAVENVPREDRSCHFAC Technical Report TR written by and published by . This book was released on 1986 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book R D Abstracts written by Technology Reports Centre (Great Britain) and published by . This book was released on 1981 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Meteorological and Geoastrophysical Abstracts written by and published by . This book was released on 1981 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Short Term Forecasting of Cloud and Precipitation Along Communication Paths written by Alan R. Bohne and published by . This book was released on 1985 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents candidate techniques for forecasting precipitation and clouds along arbitrary paths. Mapping the troposphere into a three-layer model representing the lower, middle, and upper regions is suggested. The data to be used are radar reflectivity factor and visible and infrared satellite imagery. In combination, they provide for an effective description of the storm environment. Features to be tracked and forecast are discrete contours of these data which would be generated through threshold and field gradient methods. Efficient storage and analysis requires an efficient method for description of these features. Use of field attributes is suggested. Examples of candidate methods for generating the various attribute lists, such as simple icon and positional chain coding up through complex polynomial and vortex fitting are presented. Contour translation and rotation will be determined through use of cross correlation. Methods for detecting changes in individual contours such as in size and shape, are directly linked to the attribute set chosen, and examples are provided. Due to the rapid data update rate of 5 to 10 min and the large volume of data to be processed, the use of simple and efficient forecast tools is suggested. Various candidate techniques, such as simple linear exponential filtering, are discussed. Finally, the general philosophy for solution of the problem and a general outline of the entire analysis process is presented. Keywords: Atmosphere models; Weather forecasting; Storm structure; Atmospheric precipitation.
Download or read book International Conference on Radar Meteorology written by and published by . This book was released on 1989 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1981 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conference on Severe Local Storms written by and published by . This book was released on 1981 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1981 with total page 1172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
