530 HENRY A, HUNT. 
centre is much steeper, and rain has fallen over the south coast — 
generally and extended northwards almost to Central Australia. 
On July 6th at 9 a.m. the weather chart presented the features 
shown in Chart 19. The cyclone has intensified all round, and 
has moved rapidly to the east, its centre is just entering ¢ 
Bass’ Straits; very heavy gales from south-west are blowing 
in the rear of the centre ; heavy rain is falling over Victoria and 
extends over the greater part of New South Wales. All the winds 
controlled by this storm were very heavy, and during the 6th : 
July, as the storm passed through Bass’ Straits, extremely heavy 
weather was experienced there. On July 7th it had filled up. 
: 
TYPE IX.—TORNADOES. 
These occur during the summer months, and are most frequent 
in the western plains; they are developed in hot weather and in 
the low pressure known as a “Col” between two high pressure 
when there is not enough grade to control the winds and the heat, : 
ing power of the sun is great ; if to these there is added the pre 
sence of moisture from recent showers, we have all the conditions 
for the formation of a tornado. The force of wind is often * 4 
ficient to break off growing trees, two and even three feet ia : 
diameter, and the reason there is so little damage to life and 
property is not the want of power, but the sparse population and 
the very small number of towns. 
Chart 20, March 20th, 1894. An extensive anticyclon® Ties 
south of Australia, giving way in its central parts to an extensiv? 
monsoonal dip. The isobars are generally uniform and of eve? 
gradients, though a suspicious interval exists to the west of New . 
South Wales between the 30-0 and 29-9 curves. This is - : 
doubtedly the area in which the secondary. developed. Light ea i 
were recorded in New South Wales and Victoria, but in Cent — 
Australia temperatures were high. 
Chart 21, March 21st. A marvellous change has taken pee 
The area of high pressure on the previous day over the Tasme? 4 
Sea has lost two-tenths in pressure. The monsoonal dip % sai 
i 
