Development of a Cloud Forecast Scheme for the GL Baseline Global Spectral Model PDF Download
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Author: Kenneth E. Mitchell
Publisher:
ISBN:
Category : Cloud forecasting
Languages : en
Pages : 168
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Book Description
Using forecast relative humidity (RH) from a global model, several pre-existing diagnostic RH-to-cloud schemes were tested to forecast global fractional cloud cover in a postprocessor format. Since none of the schemes tested provided a superior cloud forecast when compared to Air Force Global Weather Central's (AFGWC) operational 5LAYER cloud forecasts, a new RH-to-cloud scheme was developed by relating cumulative frequencies of forecast RH to cumulative frequencies of analyzed cloud cover from the AFGWC RTNEPH cloud analysis. This scheme creates a series of forecast time-dependent RH-to-cloud curves that can be temporally updated to account for changes in season, cloud analysis, or forecast model, The global model used was a spectral-type developed by the Geophysics Laboratory (GL) using parameterized diabatic physics presently incorporated in the operational GSM (global spectral model) at AFGWC.
Author: Kenneth E. Mitchell
Publisher:
ISBN:
Category : Cloud forecasting
Languages : en
Pages : 166
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Book Description
Using forecast relative humidity (RH) from a global model, several pre-existing diagnostic RH-to-cloud schemes were tested to forecast global fractional cloud cover in a postprocessor format. Since none of the schemes tested provided a superior cloud forecast when compared to Air Force Global Weather Central's (AFGWC) operational 5LAYER cloud forecasts, a new RH-to-cloud scheme was developed by relating cumulative frequencies of forecast RH to cumulative frequencies of analyzed cloud cover from the AFGWC RTNEPH cloud analysis. This scheme creates a series of forecast time-dependent RH-to-cloud curves that can be temporally updated to account for changes in season, cloud analysis, or forecast model, The global model used was a spectral-type developed by the Geophysics Laboratory (GL) using parameterized diabatic physics presently incorporated in the operational GSM (global spectral model) at AFGWC.
Author: Kenneth E. Mitchell
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
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Book Description
Author: Donald C. Norquist
Publisher:
ISBN:
Category : Long-range weather forecasting
Languages : en
Pages : 168
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Book Description
Author:
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 522
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Book Description
Author:
Publisher:
ISBN:
Category : Environmental geology
Languages : en
Pages : 178
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Book Description
Author:
Publisher:
ISBN:
Category : Numerical weather forecasting
Languages : en
Pages : 156
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Book Description
This report describes the results of the first 15 months of a two- year effort aimed at evaluating the advanced physics global spectral model (APGSM) developed by the Phillips Laboratory, in comparison with the currently operational GSM at Global Weather Central (GWC). Preliminary results from the verification of forecasts from the GWC GSM and APGSM, using the GWC analyses as a reference, are presented. The compaction and analysis of RTNEPH cloud data in preparation for generating and verifying cloud forecasts from the APGSM are described. The development of a cloud forecast scheme based on an application of the cloud curve algorithm to synoptically defined weather regimes is described.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
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Book Description
The completed research is in the area of cloud prediction with a high resolution global model. We have extended our studies on the handling of implicit clouds (i.e. clouds specified as a function of prevailing humidity). We have also examined this problem in the context of rainfall initialization (called physical initialization). We demonstrate a strong positive impact on cloud forecasts from such an initialization. We have also made a start on the problem of explicit cloud forecasts using cloud water mixing ratio and cloud fractions as basic forecast variables. Our preliminary results, described in the final report, are very encouraging. Mannoji (1994) has in fact noted a slight superiority of the explicit over the implicit scheme. That work was performed using a low resolution global model. Further work on the improvement of the explicit scheme at higher resolution is required. Cloud prediction, Global modelling of clouds.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
We have successfully implemented an explicit cloud scheme within the Florida State University Global Spectral Model. This includes the liquid water mixing ratio and cloud fractions as two additional dependant variables. The main purpose of this extension is two fold: we wished to improve our global cloud forecasting capability (low, medium and high clouds) and to have a better definition of the cloud radiative effects. A band model is being used for the short and long wave radiative transfer. A major component of this study is the initialization of clouds. For this purpose we have utilized the U.S. Air Force Real-Time Nephanalysis product called RTNEPH. The microwave radiances from the U.S. Air Force fleet of DMSP satellites is another source of data. These are the special sensor microwave instruments carried by these satellites. This information provides measures of vertically integrated liquid water mixing ratios. The liquid water mixing ratios are vertically partitioned using weights from the RTNEPH; this provides an initial definition of clouds and cloud fractions. These were further initialized using the procedure of physical initialization. The impact studies of this cloud specification and initialization appear very promising.
Author: New Brunswick. Department of Transportation
Publisher:
ISBN: 9781550483925
Category :
Languages : en
Pages : 1272
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Book Description
General activity review of associated branches and agencies to the Department which includes corporate securities registrations, a list of tenders received, and general financial data. Branches and agencies reviewed are responsible for motor vehicle activity, highway construction, traffic engineering, telecommunications and public utilities.
