WMOD00104

• Applicant: North American Weather Consultants, Inc.
• Sponsor Name: Denver Water
• Project Name: Cloud Seeding Evaluation
• Title: Development of Traget/Control Evaluation Procedures For the Denver Board of Water Commissioners Winter Snowpack Enhancement Project
• Prepared For: Denver Water
• Prepared By: NAWC
• Date: 12/31/2002
• County: Summit
• County: Clear Creek
• Weather Modification - Doc Type: Report

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mountaintop) level are summarized as wind roses (frequency of occurrence of wind
direction and wind speed) shown in Figure 3. The data indicate that wind flow regimes
ranging from those with winds blowing from the south through west through north are
most common for the winter storms producing precipitation (water content) of half an
inch or greater in or near the target area. This indication influenced consideration of
prospective control areas and sites for this evaluation analysis. Control sites upwind of
and/or across the wind from the target area are typically well suited, helping to avoid
contamination by the cloud seeding operations.

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Figure 3.

Wind roses of 700-mb winds during storm periods for Copper
Mountain, CO for the period 1993.2002 (left) and Echo Lake,
CO for the period 1999-2002 (right).

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