WMOD00498

• Title: Some Climatological Characteristics of Seedable Upslope Cloud Systems in the High Plains
• Date: 3/1/1973
• Weather Modification - Doc Type: Report

Figure 8: Percentage distribu-
tion of seedable upslope con-
ditions during the cold season
(September-April) for the High
Plains and its regions.

MONTHLY DISTRIBUTION
OF SEED ABLE MOIST LAYERS
20
10
oa
= 0
.2
-
:;; 20 Central
=
Cl
~
G>
~ 10
.2
oa
~
;;;)
~ 0
,CI
~ 20
'CI
G>
G>
tI.l
-
Cl 10
G>
bll
~
-
= 0
G>
..,
.. Whole High Plains
G> 20
~
10
0

Oct Dee Feb Apr Month

The southern High Plains show an abundance of seedable upslope con-
ditions in December, January, and February; 62 percent of the cold

season cloud systems occur in these 3 months.

All regions of the High Plains have relatively few seedable up-

I
I
I
I
I
1

~

slope conditions in January as compared with December and February.

The flow of moisture into the High Plains is apparently reduced some-

what during January.

4.2 Influence of Upslope -Cloud Systemscn Cold Season Precipitation
Data were available from 11 rawinsonde stations in the High Plains

for the period January 1961 to December 1970. The total number of

episodes of seedable upslope conditions at all 11 st~tions during the

14