. Compendium of meteorology. Meteorology. (g) JFMAMJJASOND (h) JFMAMJJASOND Fig. 2.—A summary of the evidence bearing on the freeze-up of Hudson Bay. Maps (a-d)—mean air temperature, 1930-48, November-February. Curve (e)—temperature differences (upper curve) between west and east coast of Baffin Bay at latitude 70°N, showing year-round mildness of Greenland coast; (lower curve) between west and east coast of Hudson Bay, showing greater warmth of east coast during fall months only. Curve (/)—Burbidge's modification curve for cP air- streams (see text). Curves (?) and (^)—mean monthly pre- cipit
. Compendium of meteorology. Meteorology. (g) JFMAMJJASOND (h) JFMAMJJASOND Fig. 2.—A summary of the evidence bearing on the freeze-up of Hudson Bay. Maps (a-d)—mean air temperature, 1930-48, November-February. Curve (e)—temperature differences (upper curve) between west and east coast of Baffin Bay at latitude 70°N, showing year-round mildness of Greenland coast; (lower curve) between west and east coast of Hudson Bay, showing greater warmth of east coast during fall months only. Curve (/)—Burbidge's modification curve for cP air- streams (see text). Curves (?) and (^)—mean monthly pre- cipitation for Port Harrison (g) and Great Whale River (h) on east coast of Hudson Bay. warming effect month by month. The rapid decline after December is very striking. 2. This heating leads to the development of an un- stable layer at low levels, with lapse rates close to the dry adiabatic. By late November, the peak time, the average depth of the unstable layer is 7000 ft, and may attain 10,000 ft. Dense cumuliform cloud and frequent snow flurries occur within the layer, and total snowfalls along the Quebec coast are heavy (over 30 in. in No- vember). With the freeze-up, the unstable layer dis- appears or becomes very shallow (less than 1000 ft) as do the cloud and snow. In Fig. 2, diagrams (g) and (h) represent mean monthly precipitation at Port Har- rison and Great Whale River, respectively, on the east coast of the Bay. In both cases heavy autumnal snow gives way to light falls in the new Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Meteorological Society. Committee on the Compendium of Meteorology; Malone, Thomas F. Boston : American Meteorological Society
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