parcel method

parcel method

[′pär·səl ‚meth·əd]
(meteorology)
A method of testing for instability in which a displacement is made from a steady state under the assumption that only the parcel or parcels displaced are affected, the environment remaining unchanged.
References in periodicals archive ?
Officers battling to prevent a Paris-style attack in the UK are concerned terrorists are using the parcel method to get hold of firearms, he told a national newspaper.