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VOL. Xv. (2) NOTES ON A DAILY WEATHER CHART 153 
the south of the Scandinavian anti-cyclone, and advance 
slowly towards the east, or sometimes, even, towards 
the west. 
These types are so named because the prevailing wind 
in each is from South, West, North and East respectively. 
The general idea of weather types will be readily under- 
stood by considering the fact, familiar to all observers, 
that the weather in this country frequently occurs in spells 
of several weeks’ duration, in which time there is a 
remarkable persistence of the general type of weather, 
over-riding both a considerable fluctuation from day to 
day, and a considerable local variation from place to place. 
For instance, the wind will often back to some point of 
south, with a high temperature, a dull sky, and rain, and 
then veer to some point of west, with a cooler air and 
brighter sky ; and, after a day or so of fine weather, it will 
back again to the south with bad weather, perhaps this 
time rising to the intensity of a gale, and, subsequently, 
veer towards the west with finer weather, and so on 
for weeks at a time. 
The changes only vary in intensity and detail, not in 
general character, while the feel of the weather and the 
look of the sky remain through all of them what are 
customarily associated with westerly winds. 
Similarly, the wind will often come persistently from 
some point of east, fluctuating between south-east for 
fouler weather, and north-east for finer weather, and back 
again with many variations for several weeks, during 
which the predominant features of the weather are always 
characteristic of east winds. The frequent recurrence 
of particular types of weather at particular seasons of the 
year is also a matter of common observation: the north- 
east winds of March, the cold north winds of the middle 
of June, and the wet west winds of September are well- 
known instances. 
b 
