WMOD00285 ‎(2)‎

• Title: Feasibility Study of Wintertime Cloud Seeding to Augment Arizona Water Supplies
• Date: 1/1/1987
• State: AZ
• Weather Modification - Doc Type: Report

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Table 8. - Daily precipitation frequencies by Winslow 500 millibar temperature range for each of
a wet. normal and dry winter at station group GP2.*
FREQUENCY AND COLUMN PERCENT

Stat ion
q roup GP2 -5 oC to -10 oC -11 oC to -20 oC -21 oC to -26 oC -27 oC & colder
Preci pitat i on I
Ra n qe (i n) Wet Norm Dry Wet Norm Dry Wet Norm Dry Wet Norm Dry
1 7 7 82 92 95 8 11 13 0 1 0
0 100.0 100.0 100.0 70.1 76.7 84.8 25.8 44.0 48.1 0 25.0 0
0 0 0 7 9 9 6 1 4 2 0 2
>0. - 0.025 0 0 0 6.0 7.5 8.0 19.4 4.0 14.8 18.2 0 40.0
0 0 0 7 7 4 3 3 2 0 0 0
>0.025 - 0.05 0 0 0 6.0 5.8 3.6 9.7 12.0 7.4 0 0 0
0 0 0 12 7 2 6 6 4 4 2 1
>0.05 - 0.20 0 0 0 10.3 5.8 1.8 19.4 24.0 14.8 36.4 50.0 20.0
0 0 0 4 0 1 5 0 2 1 0 1
>0.20 - 0.30 0 0 0 3.4 0 0.9 16.1 0 7.4 9.1 0 20.0
0 0 0 2 2 1 2 3 1 2 0 0
>0.30 - 0.40 0 0 0 1.7 1.7 0.9 6.5 12.0 3.7 18.2 0 0
0 0 0 0 1 0 1 0 0 0 1 1
>0.40 - 0.50 0 0 0 0 0.8 0 3.2 0 0 0 25.0 20.0
0 0 0 0 0 0 0 0 0 0 0 0
>0.50 - 0.60 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 0 0 0 0 0 0 0 0
>0.60 - 0.70 0 0 0 0.9 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 1 0 0
>0.70 - 0.80 0 0 0 0 0 0 0 0 0 9.1 0 0
0 0 0 2 2 0 0 1 1 1 0 0
>0.80 0 0 0 1.7 1.7 0 0 4.0 3.7 9.1 0 0
**
Total cases 0 0 0 35 28 17 23 14 14 11 3 5

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* The 500 millibar temperatures were extracted from the 1200 Z sounding at Winslow. Precipitatlon
measurements were generally taken at 1800 local. The wet normal and dry winters were respectively
1982-83, 1981-82, 1980-81.
** Values exclude zero precipitation counts