WMOD00176

• Project Name: Annual Report
• Title: Seeding Operations & Atmospheric Research, 2005 Annual Report
• Prepared By: Duncan Axisia
• Date: 12/31/2005
• Weather Modification - Doc Type: Report

Evaluation for the New Mexico counties

.
.
.
.
.
.'
..
~

TUlonhdhr<:><:> r-Inllrlc:: WArA C::AAnAn ::Inn inFmtifiAd bv TITAN over Lea and Roosevelt Counties in 14
.....-.."J .111_- -.---- ----- ------ ----- -~-~-----.~ ~- -J
operational days over New Mexico. Three clouds did not get proper data.

44

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
e
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

Small Clouds

Evaluations were done using TITAN and NEXRAD data.

Table 2 shows the results from the classic TITAN evaluation for the 7 small seeded clouds which
obtained proper control clouds.

Table 2. Seeded Sample versus Control Sample (7 couples, averages)

Variable Seeded Sample Control Sample Simple Ratio Increases (%)
Lifetime 50 min 30 min 1.67 67 (52)
Area 2 2 1.74 74 (26)
41 .7 km 24.0 km
Volume 125.6 km3 64.2 km3 1.96 96 (46)
Top Height 7.5km 6.9 km 1.09 9 (5)
MaxdBZ 47.8 -46.3 1.03 3 (5)
Top Height of 4.4 km 4.4 km 1.00 o (-6)
max dBZ
Volume 10.4 km3 2.5 km3 4.16 316 (96)
Above 6 km
Prec. Flux 379.6 m 3 /s 168.4 m3 /s 2.25 125 (85)
Prec. Mass 1368.6 kton 279.9 kton 4.88 388 (104)
Cloud Mass 147.7 kton 63.1 kton 2.34 134 (87)
11 9.3 4.4 2.11 111 (9)

Bold values in parentheses are modeled values; whereas., is defined as the quotient of Precipitation
Mass divided by Cloud Mass, and is interpreted as efficiency (cloud mass here is a fraction of the real
mass, that fraction the radar can detect). A total of 14 flares were used in this sub-sample with a very
good timing (71 %) for an effective dose about 60 ice-nuclei per liter. An excellent increase of 104 %
in precipitation mass together with an increase of 87 % in cloud mass illustrates that the seeded clouds
grew at expenses of the environmental moisture (they were open systems) and used only a fraction of
this moisture for their own maintenance. The increases in lifetime (52 %), area (26 %), volume (46 %)
and Precipitation flux (85 %) are notable, and indicate some dynamic responses. There are slight
increases in maximum reflectivity (5 %), and in top height (5%). The seeded sub-sample seemed 87 %
more efficient than the control sub-sample. Results are evaluated as very good over this small sample
(really small).