نتایج جستجو برای: cumulus parameterization in numerical weather prediction models can significantly affect severe weather forecasts

تعداد نتایج: 17395279  

2008
Guohui Li Yuan Wang Renyi Zhang

[1] A two-moment bulk microphysical scheme has been implemented into the Weather Research and Forecasting (WRF) model to investigate the aerosol-cloud interaction. The microphysical scheme calculates the mass mixing ratios and number concentrations of aerosols and five types of hydrometeors and accounts for various cloud processes including warm and mixed phase microphysics. The representation ...

2010
Mozheng Wei Zoltan Toth Yuejian Zhu

NWP forecast performance has made great progress during the past decade due to a few important factors. First, the numerical forecast models at major numerical weather prediction (NWP) centres have improved tremendously due to more accurate physics parametrisation schemes and increased computing power, which permits the use of higher resolution forecast models. Second, more observations, more a...

2006
James E. Evans Elizabeth R. Ducot

n Flight delays are now a major problem in the U.S. National Airspace System. A significant fraction of these delays are caused by reductions in en route capacity due to severe convective weather. The Corridor Integrated Weather System (CIWS) is a fully automated weather analysis and forecasting system designed to support the development and execution of convective weather impact mitigation pla...

2017

Processes occurring at the land surface are known to have an impact in weather and climate variability in a wide range of timescales, from hours to millennia, making land surface models a required component of both weather and climate prediction systems. Of special relevance is the role of land surface processes involving vegetation and soil water in the amplification of extreme weather and cli...

2014

European framework for online integrated air quality and meteorology modeling (EuMetChem) focuses on a new generation of online integrated Atmospheric Chemical Transport (ACT) and Meteorology (Numerical Weather Prediction and Climate) modeling with two-way interactions between different atmospheric processes including chemistry (both gases and aerosols), clouds, radiation, boundary layer, emiss...

1986
Richard I. Kittredge Alain Polguère Eli Goldberg

This paper describes a system (RAREAS) which synthesizes marine weather forecasts directly from formatted weather data. Such synthesis appem~ feasible in certain natural sublanguages with stereotyped text structure. RAREAS draws on several kinds of linguistic and non-linguistic knowledge and mirrors a forecaster's apparent tendency to ascribe less precise temporal adverbs to more remote meteoro...

1994
C. F. Baillie G. Carr L. Hart T. Henderson

Two mesoscale numerical weather prediction models, Eta and the Rapid Update Cycle (RUC), are currently being run operationally at the U.S. National Weather Service’s National Meteorological Center to produce nationwide weather forecasts. Improvements in weather forecast accuracy depend on increasing model resolution, which is limited by available computing resources. Massively Parallel Processi...

2014
Nir Y. Krakauer Brian Vant-Hull

Meteorological forecasts of incident solar radiation are valuable for solar resource owners and others. Most previously described forecast methods provide a single predicted value. However, a well-calibrated forecast probability distribution is more useful in that it could be used to make optimum decisions under any decision rule. We demonstrate methods of constructing and evaluating probabilis...

2006
V Lakshmanan

Probabilistic forecasts can capture uncertainty better and provide significant economic benefits because the users of the information can calibrate risk. For forecasts in earth-centered domains to be useful, the forecasts have to be clearly demarcated in space and time. We discuss the characteristics of a good probability forecast – reliability and sharpness – and describe well-understood techn...

2005
Harvey Stern

The WMO (World Meteorological Organization) weather research programme, THORPEX (The Observing System Research and Predictability Experiment), ‘responds to the challenges associated with accelerating improvements in the skill of highimpact weather forecasts that (firstly) reduce and mitigate weather disasters and (secondly) increase the benefits provided by improved forecasts...(because) the te...

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