THE RIVER BURE AXD ITS TRIBUTARIES. 243 
previous day being from the North-west. The result is shown 
in the following figures : — 
1906. 
Height. 
Range. 
Duration. 
Difference from 
predicted H.W. 
Wind. 
Feb. 
L. 
w. 
H. w. 
L. W. to 
H. W. 
L. W. to 
H. W. 
H.W. to 
L. W. 
Earlier. 
Later. 
ft. 
in. 
it. in. 
ft. in. 
h. m. 
h. 
m. 
m. 
9 
a.m. 
3 
O 
7 3 
4 3 
5 55 
5 
47 
— 
l6 
N.W., strong 
p.m. 
I 
5 
7 6 
6 1 
6 33 
6 
40 
— 
15 
(Full moon) 
IO 
a.m. 
I 
O 
3 0 
4 0 
5 30 
6 
25 
— 
5 
S.W., mod. gale 
p.m. 
2 
6 
4 10 
7 4 
6 0 
6 
IO 
— 
20 
II 
a.m. 
I 
6 
5 5 
6 11 
6 10 
6 
5 
— 
20 
Westerly 
p.m. 
O 
3 
6 9 
6 6 
6 0 
— 
6 
It is very noticeable that the height of both high and low 
water while the South-west wind was blowing was greatly 
below the preceding and following tides. 
Roughly speaking, it may be said of the tide records at 
Yarmouth, that when the low water level is below zero it 
will generally be found that Southerly and Easterly winds 
prevailed at the time, whereas, when the level of low water is 
unusually high it is almost invariably due to Northerly winds. 
As regards the time of high and low water, Northerly winds 
hold back the ebb tide and often accelerate the flood so that 
a long period may elapse between high and low water, the 
duration of the ebb being often prolonged. The acceleration 
of the flood often causes the time of high water to be much 
earlier than was predicted. 
On the other hand, Southerly winds do not seem to have so 
regular an influence. On the whole their tendency is to delay 
the time of high water. 
The subject of ^the influence of winds upon tide is an 
extremely difficult one, and it does not appear possible to 
predict the effect of any wind with any approach to certainty. 
I have given above one or two selected examples where the 
influence is most clearly shown, but there are innumerable 
cases where disturbances of the tide do not seem traceable 
to the conditions of weather prevailing. The effect of 
atmospheric pressure I have not attempted to deal with ; 
an interesting discussion of this subject will be found in Mr. 
Wheeler’s ‘ Practical Manual of Tides and Waves.’ p. 85. 
