An introduction is made to the design,development,and core technology of an expressway weather forecasting and service system based on GIS,taking Shaanxi Province as an example.

According to the data collected by 17 weather station along the Shanxi speedway, this paper analyses the clime and feature of fog, and on the basis of it, paper divides the foggy weather into different forecast service period and speedway section, this provides powerful reliance for speedway forecast service.

So the different forecast service periods for heavy fog in different sections of the highway are put forward,so as to provide the basi.

We analyzed the actuality of professional forecasting service,and then constructed a perfect dynamic monitoring,analyzing and forecasting serving system for heavy rainstorm and severe convection.

A weather forecast system of lancang river valley based on time sequence data mining;

Uran Stagnant Floods Weather Forecasting Business Service System;

The specialized weather forecast system in Datong;

In This article the progress of the operational system for meteorological prediction in China were reviewed In particular, the major R&D achievements in NWP operational system are summarized Some key experiences for modernization of meteorological services in China are discussed Finally, the outlook of future meteorological prediction systems in the 21st century are addressed briefly

Applying the theory and methods of machine leaning in meteorological prediction,research of rainfall amount classification is conducted based on Bayesian deducing and learning theory,an algorithm named learn-and-classify--rainfall is presented for predicting rainfall amount with Na?ve Bayesian classifier to improve prediction accuracy.

It is shown that the model has strong capacity for forecasting the heavy rain and is suitable for hydrometeorological forecast.