WMOD00425

• Title: Demonstration of Improved Operational Water Resources Management Through Use of Better Snow Water Equivalent Information
• Date: 9/1/2002
• Weather Modification - Doc Type: Report

. :nO"';~'"~O't~...;. 1l'm.....--.. 'Oq1(.....

iiiEA, '....' ~,~ ,,-".,,'..':,~.~~~,
~~ ~,_:';
, ", " ,'" ~",. ;'Il>t "f
, - -~,~, .:.._-- .",
K:::s.~- -. . ....;lII.Ill.)I
.._,.,...)..,.,..':~'" ",r
IIr"4 ~ - ~-
. ,....".'."~f>
.r

I
I

I
I

".

_.....:llXKI"ll
-.,'

I
I
I

--

IIF

(:I

'''''.1<100''1
".r

-

, II

,.....;J<fI\;'1l
-.",'

"" "

_""'_'11
".,

I

" .. -..",
~-
..

"

._lOlOJ01
'.ot

I
I

.1'

.",,,_"1
-""

-
.'

._-

, "~'~'''--
~.-.a..- , ['.

,_~Ul
" ",'

I
I
I
I

.,.. .~. '(0 - ... -til
1.11,

Figure B.-Hourly VPRs with bright band at 50-km range intervals (range
increasing to right), for altitudes 0-5 km above the Minneapolis radar level.
Thin red line is melting level as measured at first (top) hour. Horizontat axis of
each panel is cumulative percentage of range bins. Dale is 6 November 2000
(same case study as figure 7).

6.3.2 SnoK', Melting SIIOK', Rain Classification

Several cases with obvious bright band contamination were analyzed to develop a precipitation-
typing scheme. The allitudc of the top of the brighl band was determined at neaHo-intermcdiate
ranges using all four lower lills. It appeared that there was no contamination as long as the l'Iltin'
beam was higher lhan (he 0 oC altitude and in only dry snow. This observalion also matches
what one would expecl from brighl band lheory. Therefore, il i~ important to know lhe altitude
above radar level of the highest 0 oC altitude. Prom the reference frame of a snow particle. this is
the (first) mehing level. Data from beam elevations entirely above lhis level are therefore used to
generale S and SO. .IS wilh the old SAA.

22

I
I
I
I
I