BasedontherealcaseofafrontalprecipitationprocessaffectingSouthChina,27controllednumericalexperimentswasmadefortheeffectsofhydrostaticandnon-hydrostaticeffects,differentdrivingmodels,combinationsofinitial/boundaryconditions,updatesoflateralvaluesandinitialtimelevelsofforecast,onmodelpredictions.Featuresabouttheimpactofinitial/boundaryconditionsonmesoscalenumericalweatherprediction(NWP)modelareanalyzedanddiscussedindetail.Sometheoreticallyandpracticallyvaluableconclusionsaredrawn.ItisfoundthattheoveralltendencyofmesoscaleNWPmodelsisgovernedbyitsdrivingmodel,withtheinitialconditionsshowingremarkableimpactsonmesoscalemodelsforthefirst10hoursofthepredictionswhileleavinglateralboundaryconditionstotakecaretheperiodbeyond;thelatteraffecttheinnerareaofmesoscalepredictionsmainlythroughthepropagationandmovementofweathersignals(waves)ofdifferenttimescales;initialvaluesofexternalmodelparameterssuchassoilmoisturecontentmayaffectpredictionsofmorelongertimevalidity,whilefastsignalsmaybefilteredawayandonlyinformationwithtimescale4timesaslargeasormorethantheupdatedperiodofboundaryvaluesmaybeintroduced,throughlateralboundary,tomesoscalemodels,etc.Someresultsmaybetakenasimportantguidanceonmesoscalemodelanditsdataassimilationdevelopmentsofthefuture.
