NOTES FROM THE METEOROLOGICAL SERVICE

SUMMARY REPORT OF THE WEATHER IN CANADA

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NOVEMBER, 1918

Precipitation. The precipitation was quite deficient over the larger portion of the Dominion, but there were certain localities where conditions were reversed and more than the normal amount was registered. For instance, Northern British Columbia experienced considerably more snow and rain than the usual quantity. Winnipeg had a positive departure of about twothirds. Also over Lakes Superior and Huron the average precipitation was exceeded, as it was at Montreal and over the Bay of Fundy. The chief negative departures occurred near Lakes Erie and Ontario, and over the greater part of the Province of Quebec, and were about half of the average quantity. The amount of snow that fell was everywhere light, except in the northern portion of the interior of British Columbia, where at the close of the month snow lay on the ground to a depth of 27 inches. In northern parts of Ontario and Quebec there was at the same time from 3 to 4 inches on the ground.

Temperature.-The temperature was from average to 2o below in the western half of British Columbia, and from the Bay of Fundy eastward to Cape Breton, otherwise it was above the average throughout the Dominion. The positive departure in the Western Provinces was especially marked, varying from 4° to 10°. In Ontario also it was very noticeable, ranging from 4° to 7°.

MAGNETIC OBSERVATIONS

OCTOBER, 1918

During the month of October there was considerable disturbance of the earth's magnetic field. In the accompanying table is given a summary of the larger disturbances which occurred during the month.

The most pronounced of these disturbances was the one from October 15th to 18th in which from October 16 4h G.M.T. to 17h G.M.T. the changes in Force and direction were exceedingly rapid and of large magnitude.

The aurora was observed throughout Canada particularly bright on the night of the 8th, and a little less so on the 3rd, and 15th. Only on five nights during the month are there no reports of the aurora.

Mr. Blake reports the sun spot activity during October to have continued quite pronounced.

The value of I at Meanook is the mean of all the observations made during the month without regard to the time of day.

The value of H at Meanook is the mean of two observations made about the middle of the month, and the Z is obtained by the formula Z - ! tan I.

W. E. W. J.

EARTHQUAKE RECORDS BY THE MILNE SEISMOGRAPH

TORONTO

SIR FREDERIC STUPART, Director.

P.T. = Preliminary Tremors. S. Secondary Waves. L. W. = Large Waves. A.C. = Air Currents. Time is Greenwich Civil Mean Time, o or 24 h =

midnight.