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 7. . Daily precipitation frequencies by Winslow 500 millibar temperature range for each of
a wet. normal and dry winter at station group GP1.*
FREQUENCY AND COLUMN PERCENT

Station
group GP1 -5 oC to -10 oC -11 oC to -20 oC -21 oC to -26 oC -27 oC & colder
Preci pitati on
Ra n ge (i n) Wet Norm Dry Wet Norm Dry Wet Norm Dry Wet Norm Dry
0 6 7 70 81 91 10 9 12 0 1 1
0 0 85.7 100.0 59.8 67.5 81.3 32.3 36.0 44.4 0 25.0 20.0
1 1 0 7 8 3 2 1 2 2 0 1
>0. - 0.025 100.0C 14.3 0 6.0 6.7 2.7 6.5 4.0 7.4 18.2 0 20.0
0 0 0 5 6 3 2 4 1 2 0 0
>0.025 - 0.05 0 0 0 4.3 5.0 2.7 6.5 16.0 3.7 18.2 0 0
0 0 0 15 13 11 7 3 9 2 1 1
>0.05 - 0.20 0 0 0 12.8 10.8 9.8 22.6 12.0 33.3 18.2 25.0 20.0
0 0 0 7 2 2 1 1 0 0 0 1
>0.20 - 0.30 0 0 0 6.0 1.7 1.8 3.2 4.0 0 0 0 20.0
0 0 0 4 3 1 2 4 0 1 0 0
>0.30 - 0.40 0 0 0 3.4 2.5 0.9 6.5 16.0 0 9.1 0 0
0 0 0 4 3 0 3 1 1 0 0 U
>0.40 - 0.50 0 0 0 3.4 2.5 0 9.7 4.0 3.7 0 0 0
0 0 0 0 1 1 2 1 0 1 0 1
>0.50 - 0.60 0 0 0 0 0.8 0.9 6.5 4.0 0 9.1 0 2U.0
0 0 0 1 1 0 2 0 0 0 0 0
>0.60 - 0.70 0 0 0 0.9 0.8 0 6.5 0 0 0 0 0
0 0 0 0 0 0 0 0 1 1 0 0
>0.70 - 0.80 0 0 0 0 0 0 0 0 3.7 9.1 0 0
0 0 0 4 2 0 0 1 1 2 2 0
>0.80 0 0 0 3.4 1.7 0 0 4.0 3.7 18.2 50.0 0
**
Total cases 1 I 1 0 I 47 39 21 21 16 15 11 3 4 i

w
....,

* The 500 millibar 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