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 9. - Daily precipitation frequencies by Winslow 500 millibar temperature range for each of a
wet norma and dry winter at station group GP3.*
FREQUENCY AND COLUMN PERCENT

Station
group GP3 -5 oC to -10 oC -11 oC to -20 oC -21 oC to -26 oC -27 oC & colder
Precipitation
Range (in) ~4et Norm Drv Wet Norm Drv Wet Norm Dry Wet Norm Dry
1 7 7 74 92 91 5 12 10 0 1 0
0 100.0 100.0 100.0 63.2 76.7 81.3 16.1 48.0 37.0 0 25.0 0
0 0 0 3 10 8 2 0 0 1 0 0
>0. - 0.025 0 0 0 2.6 8.3 7.1 6.5 0 o. 9.1 0 0
0 0 0 6 3 6 2 3 1 0 0 0
>0.025 - 0.05 0 0 0 5.1 2.5 5.4 6.5 12.0 3.7 0 0 0
0 0 0 16 9 4 13 4 10 4 1 3
>0.05 - 0.20 0 0 0 13.7 7.5 3.6 41.9 16.0 37.0 36.4 25.0 60.0
0 0 0 5 1 2 3 2 2 2 0 0
>0.20 - 0.30 0 0 0 4.3 0.8 1.8 9.7 8.0 7.4 18.2 0 0
0 0 0 5 2 1 3 0 2 1 1 0
>0.30 - 0.40 0 0 0 4.3 1.7 0.9 9.7 0 7.4 9.1 25.0 0
0 0 0 2 0 0 2 1 0 0 0 1
>0.40 - 0.50 0 0 0 1.7 0 0 6.5 4.0 0 0 0 20.0
0 0 0 4 0 0 0 1 1 1 0 0
>0.50 - 0.60 0 0 0 3.4 0 0 0 4.0 3.7 9.1 0 0
0 0 0 0 0 0 0 1 0 0 0 0
>0.60 - 0.70 0 0 0 0 0 0 0 4.0 0 0 0 0
0 0 0 1 0 0 0 0 1 0 0 0
>0.70 - 0.80 0 0 0 0.9 0 0 0 0 3.7 0 0 0
0 0 0 1 3 0 1 1 0 2 1 1
>0.80 0 0 0 0.9 2.5 0 3.2 4.0 0 18.2 25.0 20.0
**
Total cases 0 0 0 43 28 21 26 13 17 11 3 5

W
\0

* The 500 mil bar temperatures 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