WMOD00176

• Project Name: Annual Report
• Title: Seeding Operations & Atmospheric Research, 2005 Annual Report
• Prepared By: Duncan Axisia
• Date: 12/31/2005
• Weather Modification - Doc Type: Report

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Large Clouds

The sub-sample of 3 large seeded clouds received a synergetic analysis. In average, the seeding
operations on these large clouds affected 85 % of their whole volume; with a very good timing (67 % of
the material went to the clouds in their first half-lifetime). A total of 7 flares were used in .this sub-
sample for an effective dose about 17 ice-nuclei per liter.

Also in average, large clouds were about 30 minutes old when the operations took place; the operation
lasted about 20 minutes, and the large seeded clouds lived 130 minutes.

Table 7 shows the corresponding results:

Variable Seeded Sample Control Sample Simple Ratio Increases (%)
Lifetime 130 min 105 min 1.24 24
Area 2 2 1.06 6
152 km 143 km
Volume 602 km 3 537 km 3 1.12 12
Volume 173 km 3 146 km3 1.18 18
Above 6 km
Prec. Flux 1781 m3/s 1635 m3 /s 1.09 9
Prec. Mass 13715 kton 10237 kton 1.34 34

~__ ~___ ____An increase of 34 % in precipitation mass for_a control value of 10237 kton in 3 cases m_ay mean:

/:12 = 3 x 0.34 x 10 237 Idon = 10441.7 Idon = 8 468 ac-f

Type B Clouds

The sub-sample of 2 type B seeded clouds received a synergetic analysis. In average, the seeding
operations on these type B clouds affected 30 % of their whole volume; with a perfect timing (100 % of
the material went to the clouds in their first half-lifetime). A total of 8 flares were used in this sub-
sample for an effective dose - 60 ice-nuclei per liter.

Also in average, type B clouds were 60 minutes old when the operations took place; the operation
lasted about 25 minutes, and the type B seeded clouds lived 190 minutes.

Table 8 shows the results: