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(a)
(b)
(c)
(d)
Fig. 2. (a) GOES-9 imagery at 18:00 UTC October 22, 2002 (04:00 local, 23 Octo-
ber). Increasing dust shown by white-yellow-green. (b) As in (a) except for 06:00 UTC
23 October (16:00 local). (c) HIRES model predicted dust concentration (g
−
3
)00UTC
October 23, 2002. (d) Synoptic observations reporting dust including lowest visibility
(km) on October 23, 2002.
5.2.
Case study 2: February 2, 2005
Figures 3(a), (b) is infrared images highlighting dust concentrations at
04:00 UTC and 19:00 UTC February 2, 2005, respectively. The model-
predicted dust concentrations for the same times are shown in Figs. 3(c),
(d). At first the dust is concentrated near Lake Eyre, which is experiencing
low level south to southeast winds, and over southwest QLD, which is closer
to the front but is also experiencing post-frontal southerly winds.
An increase in the dust concentration is evident in the satellite image
with red (high) appearing in Fig. 3(a). This is consistent with an increase
in the model predicted dust concentration values. Figure 3(e) shows syn-
optic observations that recorded dust including the lowest visibility on
February 2, 2005. The main point to note here is the low visibility values
