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 11. - Dai Iy precipitation frequencies by Winslow 500 mi ibar temperature range for each of a
wet. normal and dry winter at station group GP4.*
FREQUENCY AND COLUMN PERCENT

Stat ion
group GP4 -5 oC to -10 oC -11 oC to -20 oC -21 oC to -26 oC -27 oC & colder
Preci pitati on
Ranqe (in) Wet Norm Dry Wet Norm Dry Wet Norm Dry Wet Norm Dry
1 7 7 94 101 92 10 14 16 1 1 3
0 100.0 100.0 100.0 80.3 84.2 82.1 32.3 56.0 59.3 9.1 25.0 60.0
0 0 0 6 7 6 7 0 6 1 0 0
>0. - 0.025 0 0 0 5.1 5.8 5.4 22.6 0 22.2 9.1 0 0
0 0 0 4 1 2 0 1 2 0 1 0
>0.025 - 0.05 0 0 0 3.4 0.8 1.8 0 4.0 7.4 0 25.0 0
0 0 0 4 4 8 5 7 2 5 1 1
>0.05 - 0.20 0 0 0 3.4 3.3 7.1 16.1 28.0 7.4 45.5 25.0 20.0
0 0 0 3 2 2 1 2 0 1 1 0
>0.20 - 0.30 0 0 0 2.6 1.7 1.8 3.2 8.0 0 9.1 25.0 0
0 0 0 1 1 1 3 0 0 0 0 0
>0.30 - 0.40 0 0 0 0.9 0.8 0.9 9.7 0 0 0 0 0
0 0 0 0 1 1 1 0 0 0 0 1
>0.40 - 0.50 0 0 0 0 0.8 0.9 3.2 0 0 0 0 20.0
0 0 0 1 2 0 0 0 0 0 0 0
>0.50 - 0.60 0 0 0 0.9 1.7 0 0 0 0 0 0 0
0 0 0 1 0 0 1 0 1 1 0 0
>0.60 - 0.70 0 0 0 0.9 0 0 3.2 0 3.7 9.1 0 0
0 0 0 2 0 0 2 0 0 1 0 0
>0.70 - 0.80 0 0 0 1.7 0 0 6.5 0 0 9.1 0 0
0 0 0 1 1 0 1 1 0 1 0 0
>0.80 0 0 0 0.9 0.8 0 3.2 4.0 0 9.1 0 0
**
I I I I I I I I I I I I I
Total cases 0 0 0 23 19 20 21 11 11 I 10 I 3 I 2 I

~
.....

* The 500 millibar temperatures were extracted from the 1200 Z sounding at Winslow. Precipitation
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