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 10. - Daily precipitation frequencies by Winslow 500 m' ibar temperature range for each of
a wet. normal and dry winter at station ST2.*
FREQUENCY AND COLUMN PERCENT

Station ST2 -5 oC to -10 oC -11 oC to -20 oC -21 oC to -26 oC -27 oC & colder
Precipitation
Ranqe (in) Wet Norm Dry Wet Norm Dry Wet Norm Dry Wet Norm Dry
1 7 7 101 108 105 21 19 22 5 1 2
0 100.0 100.0 100.0 87.1 90.0 93.8 67.7 76.0 81.5 50.0 33.3 40.0
0 0 0 2 2 0 0 0 0 0 0 1
>0. - 0.025 0 0 0 1.7 1.7 0 0 0 0 0 0 20.0
0 0 0 2 3 1 0 1 0 0 0 0
>0.025 - 0.05 0 0 0 1.7 2.5 0.9 0 4.0 0 0 0 0
0 0 0 3 1 2 1 3 1 1 1 0
>0.05 - 0.20 0 0 0 2.6 0.8 1.8 3.2 12.0 3.7 10.0 33.0 0
0 0 0 0 2 2 1 1 0 0 0 0
>0.20 - 0.30 0 0 0 0 1.7 1.8 3.2 4.0 0 0 0 0
0 0 0 0 2 1 1 1 2 0 0 0
>0.30 - 0.40 0 0 0 0 1.7 0.9 3.2 4.0 7.4 0 0 0
0 0 0 0 0 1 1 0 0 0 0 1
>0.40 - 0.50 0 0 0 0 0 0.9 3.2 0 0 0 0 20.0
0 0 0 0 0 0 1 0 0 1 0 0
>0.50 - 0.60 0 0 0 0 0 0 3.2 0 0 10.0 0 U
0 0 0 3 0 0 1 0 0 0 1 0
>0.60 - 0.70 0 0 0 2.6 0 0 3.2 0 0 0 33.3 0
0 0 0 1 1 0 1 0 0 1 0 0
>0.70 - 0.80 0 0 0 0.9 0.8 0 3.2 0 0 10.0 0 0
0 0 0 4 1 0 3 0 2 2 0 1
>0.80 0 0 0 3.4 0.8 0 9.7 0 7.4 20.0 0 20.0
**
Total cases 0 0 0 15 12 7 10 6 5 5 2 3

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* 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