Observations of the United States Signal Service. 7 
In No. 34 (page 2) there was a center of low pressure in 
Minnesota, but it seemed to exert no control over the winds in 
the eastern and southern parts of the United States. Here 
- there were five centers of local cyclonic movement, each of 
which became the center of a rain-area as shown on Plate II. 
Neither of these centers became a center of low pressure 
saat the rain-area near Washington continued for sixteen 
ours. 
In No. 10 there was a center of low pressure over Lake 
Superior, but this was so distant that it exerted but little in- 
fluence over the winds near the Atlantic coast. On the 
evening of November 6th, winds from the south and east 
generally prevailed along the entire Atlantic coast, and these 
being opposed by westerly winds (the result of a high barom- 
eter in Tennessee), there was an extensive rain on the night 
of November 6th, which was especially heavy along the coast 
from Georgia to Massachusetts. This rain-fall seemed to have 
a decided influence in accelerating the movement of the center 
of low pressure, as was mentioned in my last het p. 16. 
5 was i imi o. 10, but it did 
on Ww 
not produce the same effect on the movement of the 
center, perhaps owing to the influence of another rain-area 
which prevailed near Montreal. 
No. 19 has already been referred to; see preceding page. 
In No. 82 the center of lowest pressure was beyond Lake 
Superior, but the barometer was quite low (29°56) at Port 
Stanley, and here there was apparently a local cyclone resulting 
in a heavy rain-fall. ' 
_No. 30 shows the influence of an area of high pressure com- 
bined with an area of low pressure. On the 7th of May there 
Was an area of low pressure near the mouth of the Ohio River, _ 
and an area of high pressure in New England, which gave rise 
to a system of southeast winds along the Atlantic coast, and 
extending to the Lake region. The result wasa slight rain-fall 
Over a large area of territory, but the rain was greatest about 
Lynchburg, near which place there was some evidence of 
cyclonic motion. Perhaps the Alleghany Mountains had some 
influence in determining the upward movement of the south- 
fast current near this place. 
No, 22 appears to’ have resulted from east winds along the, 
Atlantic coast op by west winds near the Mississippl, 
valley, on the south side ain area of low pressure. oo 
No. 53 has already been referred to on page 6, and it 1s — 
remarkable that the center of low pressure moved towards the . 
northeast at the rate of 54 miles per hour, leaving the center 
Of principal rain-fall almost exactly in its rear. ere were, 
Owever, at the same time two other rain areas of considerable 
