WMOD00590

• Title: Analysis and Classification of Mesoscale Cloud and Precipitation Systems
• Date: 8/1/1983
• Weather Modification - Doc Type: Report

weight and response functions and summary tables of weight function
characteristics used in this study. Examples that show the sensitivity
of the objective analysis to these weight functions demonstrate the need
for careful selection of the most appropriate band-pass filters.

I_a..
I.:
1.0
0_'
0_1
c_,
~ ~.I
It!
C.5
c..
0.3
o_a
0_1
0.0
C

RESOJ~SE ~JNC:I:\S

(

, ----...
~
---
---
& -~----'-I

.~
II V-
k / \
If / --.
, I \
f. -,
f \
;
II \
; ! * '
II
II
;,/
II
I
~

&

...- - .--.- ...
.- ....-

,.-

CI- 101J0.
GI- .40
C2- 7000.
:;~- .40
ql"- 1.35

~

,
,
"\

L!:GE:'lC
6. Rl
.. R2
. - BT
. - ;-q

"-
"-
.........
..........
............
---

.+

---..

a IX 150 aoo asc 30C !5O tX .50 50C !s;: IhlC !5C ,:it 7St !lCic !So .00 9So ::m
HFiVEL!:~..~T'" ~ i(.... ~

Fig. 3.1 Band-pass response functions used in kinematic analyses
of rawinsonde data. The wavelength of maximum response
is 210 km. Rl is the low-pass response, R2 is the
high-pass response, BT is the band-pass response, and TR
is the total response function.

Selection of the most appropriate band-pass filter is based upon
the physical scale lengths of the phenomena of interest and the spatial
distribution of observations. Generally, the minimum value for the
wavelength of maximum amplitude (\max)' based on the observation
spacing (~x) must be 2 ~x due to the need to fully observe the wave.
The total band-pass response function (Eq. 1) shows that the response is

il2