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<br />e <br /> <br />e <br /> <br />eJ <br /> <br />Attachment B <br /> <br />Seedability Criteria <br /> <br />Cloud systems that meet the following criteria are suitable for seeding: <br /> <br />l~ Cloud base water content greater than or equal to 1.5 gms/kgm. <br /> <br />2) Pre-trough or pre-frontal cloud top temperatures ~qual .to or <br />warmer than _270 C. <br /> <br />3) Post-trough or post-frontal cloud top temperatures equal to or. <br />warmer than _270 C In the Central Mountains and _300 C in the <br />San Juan Mountains. <br /> <br />4) Pre-trough wind speeds (approximately 2000 feet above the <br />barrier, and from favorable directions) up to 30 knots; post- <br />trough wind speeds up to 40 knots. <br /> <br />5) Cloud base less than 2,000 feet above the mean height of the <br />mountain barrier. <br /> <br />Seeding rate (or potential) may be adjusted according to cloud depth, <br />whether the cloud system is developing or decaying, and whether higher <br />clouds could provide natural nuclei. Seeding rates are subject to change <br />as observations and forecasts are updated. Rates may be adjusted to <br />account for pooling and ventilation resulting from low-level inversions <br />and blocking flow. <br /> <br />To allow for proper transport and diffusion of seeding materials, <br />generators are turned on one to three hours before favorable seeding <br />conditions begin. Generators are turned off one to three hours before <br />favorable seeding conditions end. <br /> <br />7686A <br />