Accession Number : ADA295452

Title :   Evaluation of NWP and Cloud Forecasts from the Phillips Laboratory Global Spectral Model.

Descriptive Note : Final rept. May 92-Nov 94,

Corporate Author : ATMOSPHERIC AND ENVIRONMENTAL RESEARCH INC CAMBRIDGE MA

Personal Author(s) : Nehrkorn, Thomas ; Mickelson, Mark ; Zivkovic, Marina ; Knowlton, Lawrence W.

PDF Url : ADA295452

Report Date : 02 DEC 1994

Pagination or Media Count : 226

Abstract : This report describes the results of a 3O-month effort aimed at evaluating forecasts of temperature, winds, humidity, and clouds from the advanced physics global spectral model (APGSM) developed by the Phillips Laboratory, in comparison with the currently operational GSM and cloud forecast models at Global Weather Central (GWC). Forecasts out to four days were generated for four separate months of 1989. Results show improved forecasts of thicknesses in the extratropics from the APGSM, but wind forecasts with generally larger errors. Forecasts of humidity are improved at some levels, regions, and forecast lead times, degraded at others. Root mean square errors of total cloud cover forecasts based on APGSM output are lower than those of the currently operational 5-layer model only for those techniques with much too smooth cloudiness distributions. (MM)

Descriptors :   *CLOUDS, *METEOROLOGICAL DATA, *WEATHER FORECASTING, *CLOUD PHYSICS, GLOBAL, PROBABILITY DISTRIBUTION FUNCTIONS, WIND, ATMOSPHERIC TEMPERATURE, TERRAIN, SPECTRA, SEASONAL VARIATIONS, WIND SHEAR, WIND VELOCITY, TROPICAL REGIONS, MEAN, ATMOSPHERIC PRECIPITATION, CLIMATOLOGY, CLOUD COVER, HEIGHT, ATMOSPHERE MODELS, HUMIDITY, CONVECTION(ATMOSPHERIC), JET STREAMS, GEOPOTENTIAL.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE