1,750 



en 1-500 



OCTOBER 



NOVEMBER 



Fig. 2.— Waterfowl populations in the Illinois River valley from mid-October to mid-November, 1954 and 1955, as de- 

 termined by aerial surveys. The survey on November 3, 1955, covered only hedf of the waterfowl habitat in the Illinois River 

 valley; the figure for the entire area was calculated from this sample. 



October 29 remained there, while another low pressure 

 area had developed in southeastern Alberta and south- 

 western Saskatchewan. A ridge of high pressure ex- 

 tended from Alaska into the District of Mackenzie. 



October 31. —The weather map for 6:30 A.M., 

 C.S.T., fig. 3, showed the low pressure area that had 

 been over Wisconsin bad shifted northward to the region 

 west of James Bay and had filled slightly; the low over 

 Alberta and Saskatchewan had remained stationary; and 

 a new low had developed over central South Dakota. A 

 high pressure area had centered over northern Yukon. \ 

 synopsis issued by the Canadian Meteorological office 

 stated the following: "The first storm of the winter is 

 centered over eastern Alberta this morning (_October 

 31_| and will move southeastward through Montana and 

 North Dakota during the day. Snow has fallen over most 



regions, with heaviest amounts in Alberta and the 

 Peace River block. Strong winds have caused blowing 

 snow in Alberta and Saskatchewan. As the system 

 moves southward colder air will gradually drop tem- 

 peratures in all regions." 



November l.-By 6:30 A.M., C.S.T., fig. 4, the low 

 pressure area west of James Bay had deepened and 

 moved northwest to the vicinity of Churchill, Manitoba. 

 The strong high remained centered over northern Yukon. 

 A pronounced cold front of Continental Arctic air was 

 moving southeastward across the Dakotas. A weak cold 

 front of Maritime and Continental Polar air was moving 

 eastward across a number of states that included 

 Michigan and Illinois. The following weather synopsis 

 was issued by the Canadian Meteorological office: 

 "Snow is still falling over the prairies this morning. 



13 



