Experiments in Regional Scale Numerical Weather Prediction Including Use of SESAME '79 Data.
Abstract
This research has as a goal testing of a state-of-the-art mesoscale model using a unique set of meteorological data and to gain insight into the modeling of radiation, clouds, precipitation and boundary layer effects in such models. Development of four-dimensional data assimilation schemes and analysis of the sensitivity of the model to horizontal and vertical resolution were also to be accomplished. The four-dimensional assimilation was deemphasized, at this time, when it became clear that the sensitivity results differed greatly from storm to storm. Scientific papers have been prepared that demonstrate the usefulness and sensitivity of such models in studying the evolution of meso-alpha (regional or sub-synoptic) and meso-beta (fronts; convection bands) disturbances. Specifically, it is clear that latent heating from convection can greatly alter the wind field on scales of 1,000 km. The first SESAME '79 case, April 10, 11, 1979 that produced the Wichita Falls, TX tornado was unique in that the cyclonic scale could not be predicted from the conventional data. The substantial variation in predictability suggests that considerable emphasis should, in the future, be placed on four-dimensional data assimilation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1981
- Accession Number
- ADA108372
Entities
People
- Carl W. Kreitzberg
Organizations
- Drexel University