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R. Giles Harrison, Keri A. Nicoll, Douglas J. Tilley, Graeme J. Marlton, Stefan Chindea, Gavin P. Dingley, Pejman Iravani, David J. Cleaver, Jonathan L. du Bois, and David Brus

November 2019, under fair weather conditions with clear skies and no appreciable local charge generation from meteorological processes. (Details of these further flights are also provided in Table 1 .) Detection of the aircraft’s charge emission was made using a Chubb JCI131 electric field mill (EFM), to measure the vertical electric field at the surface. The EFM was mounted on a 3-m-high vertical mast, separately calibrated to correct for the electric field distortion due to the presence of the

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Harry T. Ochs III and Stanley Q. Kidder

field programs. The continuing synthesis of this data to suit specific operations is best accomplished using computers. Recent advances in telecommunications and computer hardware have allowed improvedassimilation and presentation of weather data at remote field sites at significantly reduced costs. This paperdescribes a fotecasting/~oweastin$ s~rstem desisted and assembled to support a weather modification fieldproject in Illinois. With minor modifications, this system can be located anywhere that

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Christopher D. Curtis

1. Introduction Time series simulation plays an important role in developing new weather radar signal processing algorithms. Having simulated data that accurately represent the weather signal characteristics is essential. In this paper, a few modifications to conventional simulators will be introduced to improve both accuracy and performance. The focus will be on simulating single-polarization weather radar data using a Gaussian spectral model for the weather (or ground clutter) signal

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Timothy A. Alberts, Phillip B. Chilson, B. L. Cheong, and R. D. Palmer

. , 1993 : Doppler Radar and Weather Observations . 2nd ed. Academic Press, 562 pp . Doviak, R. J. , Carter J. K. , Melnikov V. M. , and Zrnić D. S. , 2002 : Modifications to the research WSR-88D to obtain polarimetric data. NOAA/NSSL Tech. Rep., 49 pp . Key, E. L. , Fowle E. N. , and Haggarty R. , 1959 : A method of side-lobe suppression in phase-coded pulse compression systems. Massachusetts Institute of Technology Tech. Rep. 209, 8 pp . Mitchell, E. D. , Vasiloff S. V

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Guangxin He, Gang Li, Xiaolei Zou, and Peter Sawin Ray

1. Introduction Radar observations play an increasingly important role in numerical weather prediction (NWP) where forecasts are initialized with data from many sources. The inclusion of radar data in real-time initialization requires substantial automation, adequate accuracy, and techniques that constitute a robust quality control (QC) on the data. One challenge with incorporating Doppler radar data is related to velocity aliasing. The range of unambiguous velocities is derived from the

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L. A. Sromovsky, J. R. Anderson, F. A. Best, J. P. Boyle, C. A. Sisko, and V. E. Suomi

attacks and uncertain performance under severe weather conditions. 2. Freshwater field tests Two field tests in freshwater lakes provided limited confirmation of heat flux and solar irradiance measurements under field conditions. a. Bulk aerodynamic comparisons at Sparkling Lake These tests investigated whether winds and waves might produce skin depth variations or flux plate displacements from the surface that would lead to substantial measurement errors. The results of the analysis described below

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B. S. Sandeepan, V. G. Panchang, S. Nayak, K. Krishna Kumar, and J. M. Kaihatu

( Shao 2008 ; Hamidi et al. 2014 ). Near-surface conditions for the Arabian Gulf may be obtained from “global” models run by various international agencies, such as the European Centre for Medium-Range Weather Forecasts (ECMWF), the U.S. National Center for Environmental Prediction (NCEP), NASA, and others; however, their resolution is coarse, typically on the order of 50 km × 50 km. This results in only a few grid points being located in Qatar. In fact, Moeini et al. (2010) have noted

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Johnson Glejin, V. Sanil Kumar, T. M. Balakrishnan Nair, Jai Singh, and Prakash Mehra

summer shamal waves and winds in the near-shore region of the Indian west coast. The variation in the existence of summer shamal swells and wind sea propagation along the west coast of India is studied during the late premonsoon (May) and strong Indian summer monsoon (June–August) seasons. The most well-known weather phenomenon in the Persian Gulf is the shamal, a northwest wind that occurs year-round ( Perrone 1979 ). The shamal is the only persistently strong wind in the region that can last for

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R. Jeffrey Trapp and Charles A. Doswell III

other applications of weather radar, it is desirable to map the radar data from their original locations in the spherical coordinate system of the radar to a uniform grid of a common (typically Cartesian) coordinate system. Smoothing and filtering of the data in some systematic way are inherent in this process of objective analysis (hereafter, OA). Some attributes of radar data pose a particular challenge to certain OA schemes. For example, the spatial distribution of data points varies continuously

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Sebastián M. Torres and Christopher D. Curtis

, Oklahoma. Section 5 concludes with a summary of findings and recommendations for the implementation of range oversampling on operational weather radars. 2. Modifications to LUT adaptive pseudowhitening The current implementation of LUT adaptive pseudowhitening assumes that the noise prior to the transformation stage is white. However, in this work, we consider the use of receiver filters with narrower bandwidths, which may result in noise that is correlated in the range-time dimension. Hence, it is

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