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

- - - - - - - .. - - - - - - - - ,- - -
Table 6. - Daily precipitation frequencies by Winslow 500 millibar temperature range for each of a
wet. normal and dry winter at station STl.*
FREQUENCY AND COLUMN PERCENT

Stat ion STl -5 oC to -10 oC -11 oC to -20 oC -21 oC to -26 oC -27 oC & colder
Precipitation
Ranqe (i n) Wet Norm Dry Wet Norm Dry Wet Norm Dry Wet Norm Dr,Y
1 6 2 68 50 90 11 4 17 2 1 2
0 100.0 100.0 100.0 80.0 89.3 94.7 40.7 44.4 77 .3 22.2 25.0 66.7
0 0 0 0 1 0 0 0 0 1 0 0
>0. - 0.025 0 0 0 0 1.8 0 0 0 0 11.1 0 0
0 0 0 2 0 1 1 0 0 1 0 0
>0.025 - 0.05 0 0 0 2.4 0 1.1 3.7 0 0 11.1 0 0
0 0 0 1 1 2 5 1 1 3 1 1
>0.05 - 0.20 0 0 0 1.2 1.8 2.1 18.5 11.1 4.5 33.3 25.0 33.3
0 0 0 3 1 0 2 0 0 0 1 0
>0.20 - 0.30 0 0 0 3.5 1.8 0 7.4 0 0 0 25.0 0
0 0 0 2 0 1 3 1 2 0 0 0
>0.30 - 0.40 0 0 0 2.4 0 1.1 11.1 11.1 9.1 0 0 0
0 0 0 1 1 0 0 0 0 1 1 0
>0.40 - 0.50 0 0 0 1.2 1.8 0 0 0 0 11.1 25.0 0
0 0 0 2 0 1 0 0 0 0 0 0
>0.50 - 0.60 0 0 0 2.4 0 1.1 0 0 0 0 0 0
0 0 0 1 0 0 2 1 0 0 0 0
>0.60 - 0.70 0 0 0 1.2 0 0 7.4 11.1 0 0 0 0
0 0 0 0 1 0 2 1 1 0 0 0
>0.70 - 0.80 0 0 0 0 1.8 0 7.4 11.1 4.5 0 0 0
0 0 0 5 1 0 1 1 1 1 0 0
>0.80 0 0 0 5.9 1.8 0 3.7 11.1 4.5 11.1 0 0
**
Total cases 0 0 0 17 6 5 15 5 5 7 3 1

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