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Transient mountain waves in an evolving synoptic-scale flow and their interaction with large scales /Chen, Chih-Chieh. January 2005 (has links)
Thesis (Ph. D.)--University of Washington, 2005. / Vita. Includes bibliographical references (p. 76-80).
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The contour-advective semi-Lagrangian hybrid algorithm approach to weather forecasting and freely propagating inertia-gravity waves in the shallow-water system /Smith, Robert K. January 2009 (has links)
Thesis (Ph.D.) - University of St Andrews, June 2009.
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The massive tornado outbreak of May 2003Kunz, Andrew Ryan. January 2005 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2005. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (December 13, 2006) Vita. Includes bibliographical references.
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Investigations into using vegetative indices in soybean breedingClark, Randi R. January 1900 (has links)
Master of Science / Department of Agronomy / William T. Schapaugh Jr / Yield in soybean (Glycine max (L.) Merr) needs to dramatically increase across the world to feed the growing population. Remote sensing and high-throughput phenotyping may provide a tool to better phenotype soybean genotypes. This research was conducted to: 1) examine the relationships between NDVI and CT with seed yield, maturity, lodging, and height, 2) determine if the time of day and growth stage have an effect on the spectral readings, 3) examine the relationships between spectral reflectance and traits associated with drought tolerance, and 4) evaluate how weather variables impact the ability of vegetative indices and canopy temperature to detect differences among genotypes. Ninety genotypes from the mapping population derived from the cross between KS4895 x Jackson were evaluated in Manhattan, KS, in 2013 and in McCune, Pittsburg, and Salina, KS in 2014. Genotypes were planted in a randomized complete bloc design in four-row, 3.4m long plots spaced 76 cm apart. Plant height, lodging, maturity and seed yield was collected on the center two rows of each plot. Spectral readings used to calculate a normalized differential vegetative index (NDVI) and canopy temperature (CT) were taken during reproductive growth. Nitrogen fixation trait and drought tolerance data was collected by the University of Arkansas. This population exhibited a substantial genetic variation for all traits evaluated. Correlations of NDVI and CT entry means with the agronomic traits were small and inconsistent. Time of day and growth stage were not important in differentiating genotypes. Differences in NDVI and CT did account for some genetic variation in drought tolerance traits, however, the strength of the associations were small. None of the weather variables were consistently associated with an increase or decrease in entry or error variance across the four environments. Stronger associations need to be established to use NDVI or CT to characterize differences in genotypes in a plant breeding program
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The use of artificial neural networks to enhance numerical weather prediction model forecasts of temperature and rainfallMarx, Hester Gerbrecht 10 February 2009 (has links)
Statistical post-processing techniques are used to remove systematic biases in modeled data. Models have shortcomings in the physical parameterization of weather events and have the inability to handle sub-grid phenomena successfully. The accuracy of forecasts interpolated to station points is limited by the horizontal resolution of the model. The magnitude of the bias at a station point depends upon geographical location and season. A neural network (NN) is a statistical downscaling method that seeks to model the linear or non-linear relationship between a set of different predictors and the predictand. NN’s have a training rule whereby the weights of connections between predictors and the predictand, are adjusted on the basis of the data. NN systems have been developed by using as input, different model variables from the NCEP Ensemble Prediction System (EPS) and Eta model to forecast minimum/maximum temperature and rainfall (Quantitative Precipitation Forecast (QPF) and Probability of Precipitation (PoP)), respectively. Results show some potential for improved NN forecasts over the forecast generated by the Numerical Weather Prediction (NWP) models. The implementation of a NN system can serve as a guidance tool in operational forecasting but with one difficulty that the NWP model has to be frozen, meaning no upgrades or changes on the model. / Dissertation (MSc)--University of Pretoria, 2009. / Geography, Geoinformatics and Meteorology / Unrestricted
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An investigation into the relationship between moon phases and precipitation maximums in British ColumbiaEmery, Frank Thomas January 1963 (has links)
The correlations between moon phases and precipitation
maximums were investigated for selected stations in British
Columbia in order to determine if they existed for:
(a) individual stations; (b) grouped stations; (c) annual
occurrences; (d) seasonal occurrences; and (e) geographic
areas. The analysis consisted of a graphical presentation
and a statistical test for randomness. Graphs of annual and
seasonal moving totals for grouped and Individual stations
were prepared. They were analyzed for peaks in the configuration
of the graphs and for annual and seasonal components
through the use of the X2p test.
It is apparent from this study that there is a relationship
between moon phases and precipitation maximums for
grouped stations and individual stations in British Columbia.
The evidence for the annual components of "lunar" precipitation
for the individual stations shows, statistically, that
the distributions are non-random and, graphically, that peaks
are visible. Moreover, a shift of the peaks with latitude is
discernible for the stations of British Columbia and it is
suggested that this shift exists on a global scale. The evidence
for the seasonal components of "lunar" precipitation for
the individual stations is not as conclusive, either statistically
or graphically. The seasonal graphs show peaks but the
test for randomness yields inconsistent results. / Arts, Faculty of / Geography, Department of / Graduate
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Simulation and Performance Analysis of Strategic Air Traffic Management under Weather UncertaintyZhou, Yi 05 1900 (has links)
In this thesis, I introduce a promising framework for representing an air traffic flow (stream) and flow-management action operating under weather uncertainty. I propose to use a meshed queuing and Markov-chain model---specifically, a queuing model whose service-rates are modulated by an underlying Markov chain describing weather-impact evolution---to capture traffic management in an uncertain environment. Two techniques for characterizing flow-management performance using the model are developed, namely 1) a master-Markov-chain representation technique that yields accurate results but at relatively high computational cost, and 2) a jump-linear system-based approximation that has promising scalability. The model formulation and two analysis techniques are illustrated with numerous examples. Based on this initial study, I believe that the interfaced weather-impact and traffic-flow model analyzed here holds promise to inform strategic flow contingency management in NextGen.
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Application of satellite cloud-motion vectors in hurricane track predictionAdams, Alan Leonard January 1976 (has links)
Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Meteorology. / Microfiche copy available in Archives and Science. / Bibliography: leaf 38. / by Alan L. Adams. / M.S.
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Adjusting storm-influenced wind observations for barotropic hurricane track prediction.Jensen, Wade Douglas January 1978 (has links)
Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Meteorology. / Microfiche copy available in Archives and Science. / Bibliography : leaves 64-65. / M.S.
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Winter Weather Observation with the Ma1 RadarNichols, Ryan T 01 January 2009 (has links) (PDF)
No description available.
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