WMOD00424

• Project Name: 1978 Delaware Rain Augmentation Project
• Title: 1978 Delaware Rain Augmentation Project - Condensed Report
• Prepared For: Secretary of Agriculture, State of Delaware
• Prepared By: Dr. Larry G. Davis, Lawrence B. Youngren
• Date: 12/1/1978
• State: DE
• Country: United States
• Weather Modification - Doc Type: Report

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shown to have a reasonable number of days with dynamic seedability.
The Dulles sounding appears to give a sufficiently good estimate of
seedability to be used on an operational basis.
Radar and aircraft measurements demonstrate that the
characteristics of the showers are similar to those measured else-
where under similar meteorological conditions. We further interpret
that the physical response from properly seeded cells is consistent
with the physical response hypothesized with the dynamic seeding
concept. The high frequency of mid-level stable layers appears to
be a key factor in the determination of seeding potential. H these
layers are at warm temperatures (_50C) or are fairly intense, seeding
with AgI does not glaciate the updraft region sufficiently to provide the
tuoyancy needed to accelerate beyond the stable layer and produce the
needed vertical growth. In the cases with an unstable cloud llayer, the
seeding response correlates well with the physical concept.

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