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 18. - Daily precipitation frequencies by Winslow 700 millibar wind direction for each of
a wet. normal and dry winter at station group GPl.*
PRECIPITATION FREQUENCY

Station
q rOUD GPl ) 00 & " 1790 ) 1800 & " 209c ) 2100 & " 239c ) 2400 & " 269c ) 2700 & " 299c
Ranqe (in) Wet Norm Dry Wet Norm Dry Wet Norm Dry Wet Norm Dry Wet Norm Dry
0 24 12 35 4 3 4 8 3 19 17 22 15 7 23 15
>0. - 0.025 3 0 2 1 1 1 2 1 0 5 2 0 1 3 0
>0.025 - 0.05 1 3 2 0 1 0 1 1 1 1 1 0 1 1 0
>0.05 - 0.20 1 4 4 2 1 2 3 4 7 7 3 2 5 2 2
>0.20 - 0.30 1 0 1 1 1 0 3 1 1 0 1 0 2 0 1
>0.30 - 0.40 0 0 0 0 0 1 2 1 0 3 4 0 0 1 0
>0.40 - 0.50 0 0 0 2 0 0 0 2 0 5 1 1 0 1 0
>0.50 - 0.60 0 0 0 0 0 0 2 1 2 0 1 0 1 0 0
>0.60 - 0.70 1 0 0 0 0 0 1 0 0 0 0 0 1 1 0
>0.70 - 0.80 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
>0.80 0 0 0 0 1 1 1 0 0 3 2 0 1 0 0
**
Total cases 7 7 9 6 5 5 15 11 11 24 15 3 12 9 4

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* The 700 millibar wind directions were extracted from the 1200 Z sounding at Winslow.
Precipitation 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