JOURNAL OF SCIENCE AND ARTS.
ART. I.-Contributions to Meteorology: being results derived from an examination of the Observations of the United States Signal Service, and from other sources; by ELIAS LOOMIS, Professor of Natural Philosophy in Yale College. Ninth paper. With Plates I, II and III.
[Read before the National Academy of Sciences, Washington, April 19, 1878.]
Low barometer at Portland, Oregon.
In my last paper, page 5, I showed that the great storms of the United States frequently come from British Columbia or its vicinity. In order to extend this part of the investigation I selected from the published volumes of the Signal Service observations (Sept., 1872, to Oct., 1874,) all those cases in which the barometer at Portland, Oregon, fell as low as 29-7 inches. These cases amount to sixty-three, and correspond to eighteen different storms, as is shown in the following table, in which column 1st shows the number of the storm; column 2d shows the date at which the barometer was below 29.7 inches; column 3d shows the height of the barometer at Portland at the date mentioned; column 4th shows the direction of the wind, and column 5th shows its velocity at Portland at the date mentioned; column 6th shows the rain-fall at Portland during the preceding eight hours; column 7th shows the least height of the barometer observed at that hour at any station within the same low area; column 8th shows the name of the station at which the barometer was lowest; column 9th indicates the region where the storm appears to have originated; Br. Co. denotes British Columbia; Can. denotes Canada, northwest; AM. JOUR. SCI.-THIRD SERIES, VOL. XVI, No. 91.-JULY, 1878.