Observations of the United States Signal Service. 7 
extended over so large an area on the west side of the low 
centre, is believed to have been the cause of the slow eastward 
progress of the storm. 
This unusual precipitation on the west side of the storm is 
ascribed in part to an east wind which prevailed at a moderate 
elevation above the earth’s surface, while a strong wind from 
the west or northwest prevailed at the surface of the earth. 
This fact is shown by the following observations of the wind 
and the upper clouds at Portland, Eastport and Halifax. 
Date. Station. Wind. Clouds. 
March 11.2 |Eastport N. W. E. 
11,2 |Halifax Ss. 
11.3 |Halifax W 8. 
12.1 |Kastpo ‘ E. 
12.1 |Portland We N. &. 
__ The precipitation on the west side of the low center ceased 
March 14th, and after that date the low center traveled rapidly 
eastward. From the 14th to the 15th its average progress was 
twenty-nine miles per hour, from the 15th to the 16th it was 
forty-seven miles per hour, from the 16th to the 17th it was 
thirty-six miles per hour, from the 17th to the 18th it was only 
thirteen miles per hour, and from the 18th to the 19th when off 
North Cape it was only eight miles per hour. The progress of 
this storm from Montana to the North Cape is shown on 
, and the isobaric curves show that there was a sudden in- 
crease in the violence of the storm on approaching the Atlantic 
eres 
No. 10 of the table on page 2 presents another example of a 
nearly stationary storm. From February 22d to the 24th the 
center of this storm remained for forty-eight hours near Quebec, 
and for the next two days the storm traveled very slowly, but 
I have no means of determining the exact position of the low 
center. The following observations show that at this time 
there was an unusual precipitation on the west side of the 
storm’s center. 
Precipitution, February 22-26, 1873. 
22.1, 22.2) 22.3 23.1) 23.3) 25.1) 25.3) 26.1) Sum 
Mt. Washington] °15 50 | 32 45 | 50 | 1-92 
~ Quebec | -40 | -30| O01 61 | 2-02 
“60| 20 
No. 40 of the table on page 2 presents another example of 
the same kind. The center of this storm remained near Father 
Point from the morning of April 30th for about two days, and 
it was four days in reaching St. Johns, Newfoundland. In 
