WMOD00276

• Contract/Permit #: 85-5071
• Title: Cooperative Weather Modification Research Program - 1985 Field Operations Plan
• Date: 1/1/1985
• State: UT
• Weather Modification - Doc Type: Report

.

.

The above criteria refer to stable or neutral periods of winter

orographic storm systems. Within winter orographic storm systems there

may also be periods when convection is dominant. Specific seeding cri-

teria for these conditions have not been developed and adopted in the

Utah project. When convective conditions occur the criteria for stable

or neutral conditions are followed in thl~ seeding decision-making pro-

cess.

.

.

d. Procedures for simultaneous conduct of the operational seeding
project and the 1985 field research program. It is clear that the
above operational seeding criteria exclude some fraction of the entire
population of wintertime clouds over thl~ Tushar Mtns. It is equally
clear that it is only with the remaining clouds meeting the criteria
that seeding, as presently conducted, has a chance of making .additional
snowfall.
A properly conceived field research program must study clouds in
both of these groups. It is important to study the clouds which do not
meet the seeding criteria since information and understanding gained
about them may suggest ways to seed the~m in future operational projects
and increase their snowfall. This could have the effect of extending
the seeding criteria to more clouds and increasing the amount of snow-
fall on the ground. It is equally important to study the clouds which
do meet the seeding criteria since information and understanding gained
about them may reveal better ways to seed them or even that seeding some
of them may not be effective. Studying clouds in both groups should

increase our understanding of all of them and, potentially, improve the

specificity and effectiveness of future seeding that may occur. The

1985 field research program will there~fore study all clouds in the

.

.

.

.

.

.

.

11