WMOD00309 ‎(2)‎

• Title: Weather Modification Programme - Catalogue of Data Sets for the International Cloud Modelling Workshop/Conference
• Date: 6/1/1984
• Weather Modification - Doc Type: Report

1. I NTRODUCTI ON

The objective of the WMO weather modification program is to provide
guidance to members on the conduct of weather modification experiments. To
carry out its objective, the program seeks to promote or facilitate the
development of tools and information that place weather modification on a
firm scientific foundation. Cloud and mesoscale modeling can make impor-
tant contributions to scientific weather modification programs. Numerical
simulations have shown promise in developing concepts and in the design,
execution and evaluation of field work. However, the potential has not
been reached. Based on the belief that a modeling workshop could accelerate
progress in this field, the WMO organized an International Cloud Modeling
Workshop to promote constructive interaction between scientists working on
theory and those working with observations in order to encourage the deve-
lopment and use of cloud models in research and application roles, espe-
cially as related to weather modification.

In October 1983 a group of numerical cloud modelers and experimental
meteorologists met at Aspen, Colorado to plan the strategy and set specific
goals and objectives for the International Workshop to be held in Europe
during July 1985. The planning session was conducted in two parts. The
first part focused on a review of current knowledge of natural and artifi-
cially modified precipitation development from both an observational and
modeling perspective. General themes of the discussion included ice evolu-
tion and precipitation development, mixing, nuclei and seeding agents, and
mathematical frameworks and parameterizations. Invited observationalists,
who have been associated with recent field investigations summarized the
basic characteristics and properties of the clouds they investigated and
presented their view of the state of knowledge on the above topics. Then
the modelers summarized the purposes and results of their on-going model
investigations including information on the characteristics of their
models, model strengths, weaknesses and problems and their views on the
state of knowledge on the above topics. Finally, modelers and obser-
vationalists interacted in the second part and discussed mutual needs for
advancing the science, identifying several areas of model experimentation
that would further the development and use of models in improving the state
of knowledge of natural and artificially modified precipitation processes.
The results of the Planning Session and the presentations of the par-
ticipants are avanable from the WMO (1984).

This catalog provides an inventory of cases which are to be used by mode-
lers who wish to participate in the Workshop. Section 2 restates the types
of model experiments that were specified at the Planning Session and their
objectives. Section 3 provides a brief description of each case that has
been selected to achieve these objectives and the reason for choosing it.
Section 4 summarizes the available data for each case by type and quality,
and describes the various formats in which the data are available.
Finally, Section 5 provides information on procedures for obtaining data and
Secti on 6 di scusses prel imi nary pl ans for thl~ Workshop.

1.